Adding upstream version 4.19.249.upstream/4.19.249upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

25 files changed, 14798 insertions, 0 deletions

diff --git a/net/openvswitch/Kconfig b/net/openvswitch/Kconfig
new file mode 100644
index 000000000..89da9512e
--- /dev/null
+++ b/net/openvswitch/Kconfig
@@ -0,0 +1,75 @@
+#
+# Open vSwitch
+#
+
+config OPENVSWITCH
+	tristate "Open vSwitch"
+	depends on INET
+	depends on !NF_CONNTRACK || \
+		   (NF_CONNTRACK && ((!NF_DEFRAG_IPV6 || NF_DEFRAG_IPV6) && \
+				     (!NF_NAT || NF_NAT) && \
+				     (!NF_NAT_IPV4 || NF_NAT_IPV4) && \
+				     (!NF_NAT_IPV6 || NF_NAT_IPV6) && \
+				     (!NETFILTER_CONNCOUNT || NETFILTER_CONNCOUNT)))
+	select LIBCRC32C
+	select MPLS
+	select NET_MPLS_GSO
+	select DST_CACHE
+	select NET_NSH
+	---help---
+	  Open vSwitch is a multilayer Ethernet switch targeted at virtualized
+	  environments.  In addition to supporting a variety of features
+	  expected in a traditional hardware switch, it enables fine-grained
+	  programmatic extension and flow-based control of the network.  This
+	  control is useful in a wide variety of applications but is
+	  particularly important in multi-server virtualization deployments,
+	  which are often characterized by highly dynamic endpoints and the
+	  need to maintain logical abstractions for multiple tenants.
+
+	  The Open vSwitch datapath provides an in-kernel fast path for packet
+	  forwarding.  It is complemented by a userspace daemon, ovs-vswitchd,
+	  which is able to accept configuration from a variety of sources and
+	  translate it into packet processing rules.
+
+	  See http://openvswitch.org for more information and userspace
+	  utilities.
+
+	  To compile this code as a module, choose M here: the module will be
+	  called openvswitch.
+
+	  If unsure, say N.
+
+config OPENVSWITCH_GRE
+	tristate "Open vSwitch GRE tunneling support"
+	depends on OPENVSWITCH
+	depends on NET_IPGRE
+	default OPENVSWITCH
+	---help---
+	  If you say Y here, then the Open vSwitch will be able create GRE
+	  vport.
+
+	  Say N to exclude this support and reduce the binary size.
+
+	  If unsure, say Y.
+
+config OPENVSWITCH_VXLAN
+	tristate "Open vSwitch VXLAN tunneling support"
+	depends on OPENVSWITCH
+	depends on VXLAN
+	default OPENVSWITCH
+	---help---
+	  If you say Y here, then the Open vSwitch will be able create vxlan vport.
+
+	  Say N to exclude this support and reduce the binary size.
+
+	  If unsure, say Y.
+
+config OPENVSWITCH_GENEVE
+	tristate "Open vSwitch Geneve tunneling support"
+	depends on OPENVSWITCH
+	depends on GENEVE
+	default OPENVSWITCH
+	---help---
+	  If you say Y here, then the Open vSwitch will be able create geneve vport.
+
+	  Say N to exclude this support and reduce the binary size.
diff --git a/net/openvswitch/Makefile b/net/openvswitch/Makefile
new file mode 100644
index 000000000..41109c326
--- /dev/null
+++ b/net/openvswitch/Makefile
@@ -0,0 +1,26 @@
+# SPDX-License-Identifier: GPL-2.0
+#
+# Makefile for Open vSwitch.
+#
+
+obj-$(CONFIG_OPENVSWITCH) += openvswitch.o
+
+openvswitch-y := \
+	actions.o \
+	datapath.o \
+	dp_notify.o \
+	flow.o \
+	flow_netlink.o \
+	flow_table.o \
+	meter.o \
+	vport.o \
+	vport-internal_dev.o \
+	vport-netdev.o
+
+ifneq ($(CONFIG_NF_CONNTRACK),)
+openvswitch-y += conntrack.o
+endif
+
+obj-$(CONFIG_OPENVSWITCH_VXLAN)+= vport-vxlan.o
+obj-$(CONFIG_OPENVSWITCH_GENEVE)+= vport-geneve.o
+obj-$(CONFIG_OPENVSWITCH_GRE)	+= vport-gre.o
diff --git a/net/openvswitch/actions.c b/net/openvswitch/actions.c
new file mode 100644
index 000000000..091202b84
--- /dev/null
+++ b/net/openvswitch/actions.c
@@ -0,0 +1,1564 @@
+/*
+ * Copyright (c) 2007-2017 Nicira, Inc.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of version 2 of the GNU General Public
+ * License as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/skbuff.h>
+#include <linux/in.h>
+#include <linux/ip.h>
+#include <linux/openvswitch.h>
+#include <linux/netfilter_ipv6.h>
+#include <linux/sctp.h>
+#include <linux/tcp.h>
+#include <linux/udp.h>
+#include <linux/in6.h>
+#include <linux/if_arp.h>
+#include <linux/if_vlan.h>
+
+#include <net/dst.h>
+#include <net/ip.h>
+#include <net/ipv6.h>
+#include <net/ip6_fib.h>
+#include <net/checksum.h>
+#include <net/dsfield.h>
+#include <net/mpls.h>
+#include <net/sctp/checksum.h>
+
+#include "datapath.h"
+#include "flow.h"
+#include "conntrack.h"
+#include "vport.h"
+#include "flow_netlink.h"
+
+struct deferred_action {
+	struct sk_buff *skb;
+	const struct nlattr *actions;
+	int actions_len;
+
+	/* Store pkt_key clone when creating deferred action. */
+	struct sw_flow_key pkt_key;
+};
+
+#define MAX_L2_LEN	(VLAN_ETH_HLEN + 3 * MPLS_HLEN)
+struct ovs_frag_data {
+	unsigned long dst;
+	struct vport *vport;
+	struct ovs_skb_cb cb;
+	__be16 inner_protocol;
+	u16 network_offset;	/* valid only for MPLS */
+	u16 vlan_tci;
+	__be16 vlan_proto;
+	unsigned int l2_len;
+	u8 mac_proto;
+	u8 l2_data[MAX_L2_LEN];
+};
+
+static DEFINE_PER_CPU(struct ovs_frag_data, ovs_frag_data_storage);
+
+#define DEFERRED_ACTION_FIFO_SIZE 10
+#define OVS_RECURSION_LIMIT 5
+#define OVS_DEFERRED_ACTION_THRESHOLD (OVS_RECURSION_LIMIT - 2)
+struct action_fifo {
+	int head;
+	int tail;
+	/* Deferred action fifo queue storage. */
+	struct deferred_action fifo[DEFERRED_ACTION_FIFO_SIZE];
+};
+
+struct action_flow_keys {
+	struct sw_flow_key key[OVS_DEFERRED_ACTION_THRESHOLD];
+};
+
+static struct action_fifo __percpu *action_fifos;
+static struct action_flow_keys __percpu *flow_keys;
+static DEFINE_PER_CPU(int, exec_actions_level);
+
+/* Make a clone of the 'key', using the pre-allocated percpu 'flow_keys'
+ * space. Return NULL if out of key spaces.
+ */
+static struct sw_flow_key *clone_key(const struct sw_flow_key *key_)
+{
+	struct action_flow_keys *keys = this_cpu_ptr(flow_keys);
+	int level = this_cpu_read(exec_actions_level);
+	struct sw_flow_key *key = NULL;
+
+	if (level <= OVS_DEFERRED_ACTION_THRESHOLD) {
+		key = &keys->key[level - 1];
+		*key = *key_;
+	}
+
+	return key;
+}
+
+static void action_fifo_init(struct action_fifo *fifo)
+{
+	fifo->head = 0;
+	fifo->tail = 0;
+}
+
+static bool action_fifo_is_empty(const struct action_fifo *fifo)
+{
+	return (fifo->head == fifo->tail);
+}
+
+static struct deferred_action *action_fifo_get(struct action_fifo *fifo)
+{
+	if (action_fifo_is_empty(fifo))
+		return NULL;
+
+	return &fifo->fifo[fifo->tail++];
+}
+
+static struct deferred_action *action_fifo_put(struct action_fifo *fifo)
+{
+	if (fifo->head >= DEFERRED_ACTION_FIFO_SIZE - 1)
+		return NULL;
+
+	return &fifo->fifo[fifo->head++];
+}
+
+/* Return true if fifo is not full */
+static struct deferred_action *add_deferred_actions(struct sk_buff *skb,
+				    const struct sw_flow_key *key,
+				    const struct nlattr *actions,
+				    const int actions_len)
+{
+	struct action_fifo *fifo;
+	struct deferred_action *da;
+
+	fifo = this_cpu_ptr(action_fifos);
+	da = action_fifo_put(fifo);
+	if (da) {
+		da->skb = skb;
+		da->actions = actions;
+		da->actions_len = actions_len;
+		da->pkt_key = *key;
+	}
+
+	return da;
+}
+
+static void invalidate_flow_key(struct sw_flow_key *key)
+{
+	key->mac_proto |= SW_FLOW_KEY_INVALID;
+}
+
+static bool is_flow_key_valid(const struct sw_flow_key *key)
+{
+	return !(key->mac_proto & SW_FLOW_KEY_INVALID);
+}
+
+static int clone_execute(struct datapath *dp, struct sk_buff *skb,
+			 struct sw_flow_key *key,
+			 u32 recirc_id,
+			 const struct nlattr *actions, int len,
+			 bool last, bool clone_flow_key);
+
+static void update_ethertype(struct sk_buff *skb, struct ethhdr *hdr,
+			     __be16 ethertype)
+{
+	if (skb->ip_summed == CHECKSUM_COMPLETE) {
+		__be16 diff[] = { ~(hdr->h_proto), ethertype };
+
+		skb->csum = csum_partial((char *)diff, sizeof(diff), skb->csum);
+	}
+
+	hdr->h_proto = ethertype;
+}
+
+static int push_mpls(struct sk_buff *skb, struct sw_flow_key *key,
+		     const struct ovs_action_push_mpls *mpls)
+{
+	struct mpls_shim_hdr *new_mpls_lse;
+
+	/* Networking stack do not allow simultaneous Tunnel and MPLS GSO. */
+	if (skb->encapsulation)
+		return -ENOTSUPP;
+
+	if (skb_cow_head(skb, MPLS_HLEN) < 0)
+		return -ENOMEM;
+
+	if (!skb->inner_protocol) {
+		skb_set_inner_network_header(skb, skb->mac_len);
+		skb_set_inner_protocol(skb, skb->protocol);
+	}
+
+	skb_push(skb, MPLS_HLEN);
+	memmove(skb_mac_header(skb) - MPLS_HLEN, skb_mac_header(skb),
+		skb->mac_len);
+	skb_reset_mac_header(skb);
+	skb_set_network_header(skb, skb->mac_len);
+
+	new_mpls_lse = mpls_hdr(skb);
+	new_mpls_lse->label_stack_entry = mpls->mpls_lse;
+
+	skb_postpush_rcsum(skb, new_mpls_lse, MPLS_HLEN);
+
+	if (ovs_key_mac_proto(key) == MAC_PROTO_ETHERNET)
+		update_ethertype(skb, eth_hdr(skb), mpls->mpls_ethertype);
+	skb->protocol = mpls->mpls_ethertype;
+
+	invalidate_flow_key(key);
+	return 0;
+}
+
+static int pop_mpls(struct sk_buff *skb, struct sw_flow_key *key,
+		    const __be16 ethertype)
+{
+	int err;
+
+	err = skb_ensure_writable(skb, skb->mac_len + MPLS_HLEN);
+	if (unlikely(err))
+		return err;
+
+	skb_postpull_rcsum(skb, mpls_hdr(skb), MPLS_HLEN);
+
+	memmove(skb_mac_header(skb) + MPLS_HLEN, skb_mac_header(skb),
+		skb->mac_len);
+
+	__skb_pull(skb, MPLS_HLEN);
+	skb_reset_mac_header(skb);
+	skb_set_network_header(skb, skb->mac_len);
+
+	if (ovs_key_mac_proto(key) == MAC_PROTO_ETHERNET) {
+		struct ethhdr *hdr;
+
+		/* mpls_hdr() is used to locate the ethertype field correctly in the
+		 * presence of VLAN tags.
+		 */
+		hdr = (struct ethhdr *)((void *)mpls_hdr(skb) - ETH_HLEN);
+		update_ethertype(skb, hdr, ethertype);
+	}
+	if (eth_p_mpls(skb->protocol))
+		skb->protocol = ethertype;
+
+	invalidate_flow_key(key);
+	return 0;
+}
+
+static int set_mpls(struct sk_buff *skb, struct sw_flow_key *flow_key,
+		    const __be32 *mpls_lse, const __be32 *mask)
+{
+	struct mpls_shim_hdr *stack;
+	__be32 lse;
+	int err;
+
+	err = skb_ensure_writable(skb, skb->mac_len + MPLS_HLEN);
+	if (unlikely(err))
+		return err;
+
+	stack = mpls_hdr(skb);
+	lse = OVS_MASKED(stack->label_stack_entry, *mpls_lse, *mask);
+	if (skb->ip_summed == CHECKSUM_COMPLETE) {
+		__be32 diff[] = { ~(stack->label_stack_entry), lse };
+
+		skb->csum = csum_partial((char *)diff, sizeof(diff), skb->csum);
+	}
+
+	stack->label_stack_entry = lse;
+	flow_key->mpls.top_lse = lse;
+	return 0;
+}
+
+static int pop_vlan(struct sk_buff *skb, struct sw_flow_key *key)
+{
+	int err;
+
+	err = skb_vlan_pop(skb);
+	if (skb_vlan_tag_present(skb)) {
+		invalidate_flow_key(key);
+	} else {
+		key->eth.vlan.tci = 0;
+		key->eth.vlan.tpid = 0;
+	}
+	return err;
+}
+
+static int push_vlan(struct sk_buff *skb, struct sw_flow_key *key,
+		     const struct ovs_action_push_vlan *vlan)
+{
+	if (skb_vlan_tag_present(skb)) {
+		invalidate_flow_key(key);
+	} else {
+		key->eth.vlan.tci = vlan->vlan_tci;
+		key->eth.vlan.tpid = vlan->vlan_tpid;
+	}
+	return skb_vlan_push(skb, vlan->vlan_tpid,
+			     ntohs(vlan->vlan_tci) & ~VLAN_TAG_PRESENT);
+}
+
+/* 'src' is already properly masked. */
+static void ether_addr_copy_masked(u8 *dst_, const u8 *src_, const u8 *mask_)
+{
+	u16 *dst = (u16 *)dst_;
+	const u16 *src = (const u16 *)src_;
+	const u16 *mask = (const u16 *)mask_;
+
+	OVS_SET_MASKED(dst[0], src[0], mask[0]);
+	OVS_SET_MASKED(dst[1], src[1], mask[1]);
+	OVS_SET_MASKED(dst[2], src[2], mask[2]);
+}
+
+static int set_eth_addr(struct sk_buff *skb, struct sw_flow_key *flow_key,
+			const struct ovs_key_ethernet *key,
+			const struct ovs_key_ethernet *mask)
+{
+	int err;
+
+	err = skb_ensure_writable(skb, ETH_HLEN);
+	if (unlikely(err))
+		return err;
+
+	skb_postpull_rcsum(skb, eth_hdr(skb), ETH_ALEN * 2);
+
+	ether_addr_copy_masked(eth_hdr(skb)->h_source, key->eth_src,
+			       mask->eth_src);
+	ether_addr_copy_masked(eth_hdr(skb)->h_dest, key->eth_dst,
+			       mask->eth_dst);
+
+	skb_postpush_rcsum(skb, eth_hdr(skb), ETH_ALEN * 2);
+
+	ether_addr_copy(flow_key->eth.src, eth_hdr(skb)->h_source);
+	ether_addr_copy(flow_key->eth.dst, eth_hdr(skb)->h_dest);
+	return 0;
+}
+
+/* pop_eth does not support VLAN packets as this action is never called
+ * for them.
+ */
+static int pop_eth(struct sk_buff *skb, struct sw_flow_key *key)
+{
+	skb_pull_rcsum(skb, ETH_HLEN);
+	skb_reset_mac_header(skb);
+	skb_reset_mac_len(skb);
+
+	/* safe right before invalidate_flow_key */
+	key->mac_proto = MAC_PROTO_NONE;
+	invalidate_flow_key(key);
+	return 0;
+}
+
+static int push_eth(struct sk_buff *skb, struct sw_flow_key *key,
+		    const struct ovs_action_push_eth *ethh)
+{
+	struct ethhdr *hdr;
+
+	/* Add the new Ethernet header */
+	if (skb_cow_head(skb, ETH_HLEN) < 0)
+		return -ENOMEM;
+
+	skb_push(skb, ETH_HLEN);
+	skb_reset_mac_header(skb);
+	skb_reset_mac_len(skb);
+
+	hdr = eth_hdr(skb);
+	ether_addr_copy(hdr->h_source, ethh->addresses.eth_src);
+	ether_addr_copy(hdr->h_dest, ethh->addresses.eth_dst);
+	hdr->h_proto = skb->protocol;
+
+	skb_postpush_rcsum(skb, hdr, ETH_HLEN);
+
+	/* safe right before invalidate_flow_key */
+	key->mac_proto = MAC_PROTO_ETHERNET;
+	invalidate_flow_key(key);
+	return 0;
+}
+
+static int push_nsh(struct sk_buff *skb, struct sw_flow_key *key,
+		    const struct nshhdr *nh)
+{
+	int err;
+
+	err = nsh_push(skb, nh);
+	if (err)
+		return err;
+
+	/* safe right before invalidate_flow_key */
+	key->mac_proto = MAC_PROTO_NONE;
+	invalidate_flow_key(key);
+	return 0;
+}
+
+static int pop_nsh(struct sk_buff *skb, struct sw_flow_key *key)
+{
+	int err;
+
+	err = nsh_pop(skb);
+	if (err)
+		return err;
+
+	/* safe right before invalidate_flow_key */
+	if (skb->protocol == htons(ETH_P_TEB))
+		key->mac_proto = MAC_PROTO_ETHERNET;
+	else
+		key->mac_proto = MAC_PROTO_NONE;
+	invalidate_flow_key(key);
+	return 0;
+}
+
+static void update_ip_l4_checksum(struct sk_buff *skb, struct iphdr *nh,
+				  __be32 addr, __be32 new_addr)
+{
+	int transport_len = skb->len - skb_transport_offset(skb);
+
+	if (nh->frag_off & htons(IP_OFFSET))
+		return;
+
+	if (nh->protocol == IPPROTO_TCP) {
+		if (likely(transport_len >= sizeof(struct tcphdr)))
+			inet_proto_csum_replace4(&tcp_hdr(skb)->check, skb,
+						 addr, new_addr, true);
+	} else if (nh->protocol == IPPROTO_UDP) {
+		if (likely(transport_len >= sizeof(struct udphdr))) {
+			struct udphdr *uh = udp_hdr(skb);
+
+			if (uh->check || skb->ip_summed == CHECKSUM_PARTIAL) {
+				inet_proto_csum_replace4(&uh->check, skb,
+							 addr, new_addr, true);
+				if (!uh->check)
+					uh->check = CSUM_MANGLED_0;
+			}
+		}
+	}
+}
+
+static void set_ip_addr(struct sk_buff *skb, struct iphdr *nh,
+			__be32 *addr, __be32 new_addr)
+{
+	update_ip_l4_checksum(skb, nh, *addr, new_addr);
+	csum_replace4(&nh->check, *addr, new_addr);
+	skb_clear_hash(skb);
+	ovs_ct_clear(skb, NULL);
+	*addr = new_addr;
+}
+
+static void update_ipv6_checksum(struct sk_buff *skb, u8 l4_proto,
+				 __be32 addr[4], const __be32 new_addr[4])
+{
+	int transport_len = skb->len - skb_transport_offset(skb);
+
+	if (l4_proto == NEXTHDR_TCP) {
+		if (likely(transport_len >= sizeof(struct tcphdr)))
+			inet_proto_csum_replace16(&tcp_hdr(skb)->check, skb,
+						  addr, new_addr, true);
+	} else if (l4_proto == NEXTHDR_UDP) {
+		if (likely(transport_len >= sizeof(struct udphdr))) {
+			struct udphdr *uh = udp_hdr(skb);
+
+			if (uh->check || skb->ip_summed == CHECKSUM_PARTIAL) {
+				inet_proto_csum_replace16(&uh->check, skb,
+							  addr, new_addr, true);
+				if (!uh->check)
+					uh->check = CSUM_MANGLED_0;
+			}
+		}
+	} else if (l4_proto == NEXTHDR_ICMP) {
+		if (likely(transport_len >= sizeof(struct icmp6hdr)))
+			inet_proto_csum_replace16(&icmp6_hdr(skb)->icmp6_cksum,
+						  skb, addr, new_addr, true);
+	}
+}
+
+static void mask_ipv6_addr(const __be32 old[4], const __be32 addr[4],
+			   const __be32 mask[4], __be32 masked[4])
+{
+	masked[0] = OVS_MASKED(old[0], addr[0], mask[0]);
+	masked[1] = OVS_MASKED(old[1], addr[1], mask[1]);
+	masked[2] = OVS_MASKED(old[2], addr[2], mask[2]);
+	masked[3] = OVS_MASKED(old[3], addr[3], mask[3]);
+}
+
+static void set_ipv6_addr(struct sk_buff *skb, u8 l4_proto,
+			  __be32 addr[4], const __be32 new_addr[4],
+			  bool recalculate_csum)
+{
+	if (recalculate_csum)
+		update_ipv6_checksum(skb, l4_proto, addr, new_addr);
+
+	skb_clear_hash(skb);
+	ovs_ct_clear(skb, NULL);
+	memcpy(addr, new_addr, sizeof(__be32[4]));
+}
+
+static void set_ipv6_dsfield(struct sk_buff *skb, struct ipv6hdr *nh, u8 ipv6_tclass, u8 mask)
+{
+	u8 old_ipv6_tclass = ipv6_get_dsfield(nh);
+
+	ipv6_tclass = OVS_MASKED(old_ipv6_tclass, ipv6_tclass, mask);
+
+	if (skb->ip_summed == CHECKSUM_COMPLETE)
+		csum_replace(&skb->csum, (__force __wsum)(old_ipv6_tclass << 12),
+			     (__force __wsum)(ipv6_tclass << 12));
+
+	ipv6_change_dsfield(nh, ~mask, ipv6_tclass);
+}
+
+static void set_ipv6_fl(struct sk_buff *skb, struct ipv6hdr *nh, u32 fl, u32 mask)
+{
+	u32 ofl;
+
+	ofl = nh->flow_lbl[0] << 16 |  nh->flow_lbl[1] << 8 |  nh->flow_lbl[2];
+	fl = OVS_MASKED(ofl, fl, mask);
+
+	/* Bits 21-24 are always unmasked, so this retains their values. */
+	nh->flow_lbl[0] = (u8)(fl >> 16);
+	nh->flow_lbl[1] = (u8)(fl >> 8);
+	nh->flow_lbl[2] = (u8)fl;
+
+	if (skb->ip_summed == CHECKSUM_COMPLETE)
+		csum_replace(&skb->csum, (__force __wsum)htonl(ofl), (__force __wsum)htonl(fl));
+}
+
+static void set_ipv6_ttl(struct sk_buff *skb, struct ipv6hdr *nh, u8 new_ttl, u8 mask)
+{
+	new_ttl = OVS_MASKED(nh->hop_limit, new_ttl, mask);
+
+	if (skb->ip_summed == CHECKSUM_COMPLETE)
+		csum_replace(&skb->csum, (__force __wsum)(nh->hop_limit << 8),
+			     (__force __wsum)(new_ttl << 8));
+	nh->hop_limit = new_ttl;
+}
+
+static void set_ip_ttl(struct sk_buff *skb, struct iphdr *nh, u8 new_ttl,
+		       u8 mask)
+{
+	new_ttl = OVS_MASKED(nh->ttl, new_ttl, mask);
+
+	csum_replace2(&nh->check, htons(nh->ttl << 8), htons(new_ttl << 8));
+	nh->ttl = new_ttl;
+}
+
+static int set_ipv4(struct sk_buff *skb, struct sw_flow_key *flow_key,
+		    const struct ovs_key_ipv4 *key,
+		    const struct ovs_key_ipv4 *mask)
+{
+	struct iphdr *nh;
+	__be32 new_addr;
+	int err;
+
+	err = skb_ensure_writable(skb, skb_network_offset(skb) +
+				  sizeof(struct iphdr));
+	if (unlikely(err))
+		return err;
+
+	nh = ip_hdr(skb);
+
+	/* Setting an IP addresses is typically only a side effect of
+	 * matching on them in the current userspace implementation, so it
+	 * makes sense to check if the value actually changed.
+	 */
+	if (mask->ipv4_src) {
+		new_addr = OVS_MASKED(nh->saddr, key->ipv4_src, mask->ipv4_src);
+
+		if (unlikely(new_addr != nh->saddr)) {
+			set_ip_addr(skb, nh, &nh->saddr, new_addr);
+			flow_key->ipv4.addr.src = new_addr;
+		}
+	}
+	if (mask->ipv4_dst) {
+		new_addr = OVS_MASKED(nh->daddr, key->ipv4_dst, mask->ipv4_dst);
+
+		if (unlikely(new_addr != nh->daddr)) {
+			set_ip_addr(skb, nh, &nh->daddr, new_addr);
+			flow_key->ipv4.addr.dst = new_addr;
+		}
+	}
+	if (mask->ipv4_tos) {
+		ipv4_change_dsfield(nh, ~mask->ipv4_tos, key->ipv4_tos);
+		flow_key->ip.tos = nh->tos;
+	}
+	if (mask->ipv4_ttl) {
+		set_ip_ttl(skb, nh, key->ipv4_ttl, mask->ipv4_ttl);
+		flow_key->ip.ttl = nh->ttl;
+	}
+
+	return 0;
+}
+
+static bool is_ipv6_mask_nonzero(const __be32 addr[4])
+{
+	return !!(addr[0] | addr[1] | addr[2] | addr[3]);
+}
+
+static int set_ipv6(struct sk_buff *skb, struct sw_flow_key *flow_key,
+		    const struct ovs_key_ipv6 *key,
+		    const struct ovs_key_ipv6 *mask)
+{
+	struct ipv6hdr *nh;
+	int err;
+
+	err = skb_ensure_writable(skb, skb_network_offset(skb) +
+				  sizeof(struct ipv6hdr));
+	if (unlikely(err))
+		return err;
+
+	nh = ipv6_hdr(skb);
+
+	/* Setting an IP addresses is typically only a side effect of
+	 * matching on them in the current userspace implementation, so it
+	 * makes sense to check if the value actually changed.
+	 */
+	if (is_ipv6_mask_nonzero(mask->ipv6_src)) {
+		__be32 *saddr = (__be32 *)&nh->saddr;
+		__be32 masked[4];
+
+		mask_ipv6_addr(saddr, key->ipv6_src, mask->ipv6_src, masked);
+
+		if (unlikely(memcmp(saddr, masked, sizeof(masked)))) {
+			set_ipv6_addr(skb, flow_key->ip.proto, saddr, masked,
+				      true);
+			memcpy(&flow_key->ipv6.addr.src, masked,
+			       sizeof(flow_key->ipv6.addr.src));
+		}
+	}
+	if (is_ipv6_mask_nonzero(mask->ipv6_dst)) {
+		unsigned int offset = 0;
+		int flags = IP6_FH_F_SKIP_RH;
+		bool recalc_csum = true;
+		__be32 *daddr = (__be32 *)&nh->daddr;
+		__be32 masked[4];
+
+		mask_ipv6_addr(daddr, key->ipv6_dst, mask->ipv6_dst, masked);
+
+		if (unlikely(memcmp(daddr, masked, sizeof(masked)))) {
+			if (ipv6_ext_hdr(nh->nexthdr))
+				recalc_csum = (ipv6_find_hdr(skb, &offset,
+							     NEXTHDR_ROUTING,
+							     NULL, &flags)
+					       != NEXTHDR_ROUTING);
+
+			set_ipv6_addr(skb, flow_key->ip.proto, daddr, masked,
+				      recalc_csum);
+			memcpy(&flow_key->ipv6.addr.dst, masked,
+			       sizeof(flow_key->ipv6.addr.dst));
+		}
+	}
+	if (mask->ipv6_tclass) {
+		set_ipv6_dsfield(skb, nh, key->ipv6_tclass, mask->ipv6_tclass);
+		flow_key->ip.tos = ipv6_get_dsfield(nh);
+	}
+	if (mask->ipv6_label) {
+		set_ipv6_fl(skb, nh, ntohl(key->ipv6_label),
+			    ntohl(mask->ipv6_label));
+		flow_key->ipv6.label =
+		    *(__be32 *)nh & htonl(IPV6_FLOWINFO_FLOWLABEL);
+	}
+	if (mask->ipv6_hlimit) {
+		set_ipv6_ttl(skb, nh, key->ipv6_hlimit, mask->ipv6_hlimit);
+		flow_key->ip.ttl = nh->hop_limit;
+	}
+	return 0;
+}
+
+static int set_nsh(struct sk_buff *skb, struct sw_flow_key *flow_key,
+		   const struct nlattr *a)
+{
+	struct nshhdr *nh;
+	size_t length;
+	int err;
+	u8 flags;
+	u8 ttl;
+	int i;
+
+	struct ovs_key_nsh key;
+	struct ovs_key_nsh mask;
+
+	err = nsh_key_from_nlattr(a, &key, &mask);
+	if (err)
+		return err;
+
+	/* Make sure the NSH base header is there */
+	if (!pskb_may_pull(skb, skb_network_offset(skb) + NSH_BASE_HDR_LEN))
+		return -ENOMEM;
+
+	nh = nsh_hdr(skb);
+	length = nsh_hdr_len(nh);
+
+	/* Make sure the whole NSH header is there */
+	err = skb_ensure_writable(skb, skb_network_offset(skb) +
+				       length);
+	if (unlikely(err))
+		return err;
+
+	nh = nsh_hdr(skb);
+	skb_postpull_rcsum(skb, nh, length);
+	flags = nsh_get_flags(nh);
+	flags = OVS_MASKED(flags, key.base.flags, mask.base.flags);
+	flow_key->nsh.base.flags = flags;
+	ttl = nsh_get_ttl(nh);
+	ttl = OVS_MASKED(ttl, key.base.ttl, mask.base.ttl);
+	flow_key->nsh.base.ttl = ttl;
+	nsh_set_flags_and_ttl(nh, flags, ttl);
+	nh->path_hdr = OVS_MASKED(nh->path_hdr, key.base.path_hdr,
+				  mask.base.path_hdr);
+	flow_key->nsh.base.path_hdr = nh->path_hdr;
+	switch (nh->mdtype) {
+	case NSH_M_TYPE1:
+		for (i = 0; i < NSH_MD1_CONTEXT_SIZE; i++) {
+			nh->md1.context[i] =
+			    OVS_MASKED(nh->md1.context[i], key.context[i],
+				       mask.context[i]);
+		}
+		memcpy(flow_key->nsh.context, nh->md1.context,
+		       sizeof(nh->md1.context));
+		break;
+	case NSH_M_TYPE2:
+		memset(flow_key->nsh.context, 0,
+		       sizeof(flow_key->nsh.context));
+		break;
+	default:
+		return -EINVAL;
+	}
+	skb_postpush_rcsum(skb, nh, length);
+	return 0;
+}
+
+/* Must follow skb_ensure_writable() since that can move the skb data. */
+static void set_tp_port(struct sk_buff *skb, __be16 *port,
+			__be16 new_port, __sum16 *check)
+{
+	ovs_ct_clear(skb, NULL);
+	inet_proto_csum_replace2(check, skb, *port, new_port, false);
+	*port = new_port;
+}
+
+static int set_udp(struct sk_buff *skb, struct sw_flow_key *flow_key,
+		   const struct ovs_key_udp *key,
+		   const struct ovs_key_udp *mask)
+{
+	struct udphdr *uh;
+	__be16 src, dst;
+	int err;
+
+	err = skb_ensure_writable(skb, skb_transport_offset(skb) +
+				  sizeof(struct udphdr));
+	if (unlikely(err))
+		return err;
+
+	uh = udp_hdr(skb);
+	/* Either of the masks is non-zero, so do not bother checking them. */
+	src = OVS_MASKED(uh->source, key->udp_src, mask->udp_src);
+	dst = OVS_MASKED(uh->dest, key->udp_dst, mask->udp_dst);
+
+	if (uh->check && skb->ip_summed != CHECKSUM_PARTIAL) {
+		if (likely(src != uh->source)) {
+			set_tp_port(skb, &uh->source, src, &uh->check);
+			flow_key->tp.src = src;
+		}
+		if (likely(dst != uh->dest)) {
+			set_tp_port(skb, &uh->dest, dst, &uh->check);
+			flow_key->tp.dst = dst;
+		}
+
+		if (unlikely(!uh->check))
+			uh->check = CSUM_MANGLED_0;
+	} else {
+		uh->source = src;
+		uh->dest = dst;
+		flow_key->tp.src = src;
+		flow_key->tp.dst = dst;
+		ovs_ct_clear(skb, NULL);
+	}
+
+	skb_clear_hash(skb);
+
+	return 0;
+}
+
+static int set_tcp(struct sk_buff *skb, struct sw_flow_key *flow_key,
+		   const struct ovs_key_tcp *key,
+		   const struct ovs_key_tcp *mask)
+{
+	struct tcphdr *th;
+	__be16 src, dst;
+	int err;
+
+	err = skb_ensure_writable(skb, skb_transport_offset(skb) +
+				  sizeof(struct tcphdr));
+	if (unlikely(err))
+		return err;
+
+	th = tcp_hdr(skb);
+	src = OVS_MASKED(th->source, key->tcp_src, mask->tcp_src);
+	if (likely(src != th->source)) {
+		set_tp_port(skb, &th->source, src, &th->check);
+		flow_key->tp.src = src;
+	}
+	dst = OVS_MASKED(th->dest, key->tcp_dst, mask->tcp_dst);
+	if (likely(dst != th->dest)) {
+		set_tp_port(skb, &th->dest, dst, &th->check);
+		flow_key->tp.dst = dst;
+	}
+	skb_clear_hash(skb);
+
+	return 0;
+}
+
+static int set_sctp(struct sk_buff *skb, struct sw_flow_key *flow_key,
+		    const struct ovs_key_sctp *key,
+		    const struct ovs_key_sctp *mask)
+{
+	unsigned int sctphoff = skb_transport_offset(skb);
+	struct sctphdr *sh;
+	__le32 old_correct_csum, new_csum, old_csum;
+	int err;
+
+	err = skb_ensure_writable(skb, sctphoff + sizeof(struct sctphdr));
+	if (unlikely(err))
+		return err;
+
+	sh = sctp_hdr(skb);
+	old_csum = sh->checksum;
+	old_correct_csum = sctp_compute_cksum(skb, sctphoff);
+
+	sh->source = OVS_MASKED(sh->source, key->sctp_src, mask->sctp_src);
+	sh->dest = OVS_MASKED(sh->dest, key->sctp_dst, mask->sctp_dst);
+
+	new_csum = sctp_compute_cksum(skb, sctphoff);
+
+	/* Carry any checksum errors through. */
+	sh->checksum = old_csum ^ old_correct_csum ^ new_csum;
+
+	skb_clear_hash(skb);
+	ovs_ct_clear(skb, NULL);
+
+	flow_key->tp.src = sh->source;
+	flow_key->tp.dst = sh->dest;
+
+	return 0;
+}
+
+static int ovs_vport_output(struct net *net, struct sock *sk, struct sk_buff *skb)
+{
+	struct ovs_frag_data *data = this_cpu_ptr(&ovs_frag_data_storage);
+	struct vport *vport = data->vport;
+
+	if (skb_cow_head(skb, data->l2_len) < 0) {
+		kfree_skb(skb);
+		return -ENOMEM;
+	}
+
+	__skb_dst_copy(skb, data->dst);
+	*OVS_CB(skb) = data->cb;
+	skb->inner_protocol = data->inner_protocol;
+	skb->vlan_tci = data->vlan_tci;
+	skb->vlan_proto = data->vlan_proto;
+
+	/* Reconstruct the MAC header.  */
+	skb_push(skb, data->l2_len);
+	memcpy(skb->data, &data->l2_data, data->l2_len);
+	skb_postpush_rcsum(skb, skb->data, data->l2_len);
+	skb_reset_mac_header(skb);
+
+	if (eth_p_mpls(skb->protocol)) {
+		skb->inner_network_header = skb->network_header;
+		skb_set_network_header(skb, data->network_offset);
+		skb_reset_mac_len(skb);
+	}
+
+	ovs_vport_send(vport, skb, data->mac_proto);
+	return 0;
+}
+
+static unsigned int
+ovs_dst_get_mtu(const struct dst_entry *dst)
+{
+	return dst->dev->mtu;
+}
+
+static struct dst_ops ovs_dst_ops = {
+	.family = AF_UNSPEC,
+	.mtu = ovs_dst_get_mtu,
+};
+
+/* prepare_frag() is called once per (larger-than-MTU) frame; its inverse is
+ * ovs_vport_output(), which is called once per fragmented packet.
+ */
+static void prepare_frag(struct vport *vport, struct sk_buff *skb,
+			 u16 orig_network_offset, u8 mac_proto)
+{
+	unsigned int hlen = skb_network_offset(skb);
+	struct ovs_frag_data *data;
+
+	data = this_cpu_ptr(&ovs_frag_data_storage);
+	data->dst = skb->_skb_refdst;
+	data->vport = vport;
+	data->cb = *OVS_CB(skb);
+	data->inner_protocol = skb->inner_protocol;
+	data->network_offset = orig_network_offset;
+	data->vlan_tci = skb->vlan_tci;
+	data->vlan_proto = skb->vlan_proto;
+	data->mac_proto = mac_proto;
+	data->l2_len = hlen;
+	memcpy(&data->l2_data, skb->data, hlen);
+
+	memset(IPCB(skb), 0, sizeof(struct inet_skb_parm));
+	skb_pull(skb, hlen);
+}
+
+static void ovs_fragment(struct net *net, struct vport *vport,
+			 struct sk_buff *skb, u16 mru,
+			 struct sw_flow_key *key)
+{
+	u16 orig_network_offset = 0;
+
+	if (eth_p_mpls(skb->protocol)) {
+		orig_network_offset = skb_network_offset(skb);
+		skb->network_header = skb->inner_network_header;
+	}
+
+	if (skb_network_offset(skb) > MAX_L2_LEN) {
+		OVS_NLERR(1, "L2 header too long to fragment");
+		goto err;
+	}
+
+	if (key->eth.type == htons(ETH_P_IP)) {
+		struct rtable ovs_rt = { 0 };
+		unsigned long orig_dst;
+
+		prepare_frag(vport, skb, orig_network_offset,
+			     ovs_key_mac_proto(key));
+		dst_init(&ovs_rt.dst, &ovs_dst_ops, NULL, 1,
+			 DST_OBSOLETE_NONE, DST_NOCOUNT);
+		ovs_rt.dst.dev = vport->dev;
+
+		orig_dst = skb->_skb_refdst;
+		skb_dst_set_noref(skb, &ovs_rt.dst);
+		IPCB(skb)->frag_max_size = mru;
+
+		ip_do_fragment(net, skb->sk, skb, ovs_vport_output);
+		refdst_drop(orig_dst);
+	} else if (key->eth.type == htons(ETH_P_IPV6)) {
+		const struct nf_ipv6_ops *v6ops = nf_get_ipv6_ops();
+		unsigned long orig_dst;
+		struct rt6_info ovs_rt;
+
+		if (!v6ops)
+			goto err;
+
+		prepare_frag(vport, skb, orig_network_offset,
+			     ovs_key_mac_proto(key));
+		memset(&ovs_rt, 0, sizeof(ovs_rt));
+		dst_init(&ovs_rt.dst, &ovs_dst_ops, NULL, 1,
+			 DST_OBSOLETE_NONE, DST_NOCOUNT);
+		ovs_rt.dst.dev = vport->dev;
+
+		orig_dst = skb->_skb_refdst;
+		skb_dst_set_noref(skb, &ovs_rt.dst);
+		IP6CB(skb)->frag_max_size = mru;
+
+		v6ops->fragment(net, skb->sk, skb, ovs_vport_output);
+		refdst_drop(orig_dst);
+	} else {
+		WARN_ONCE(1, "Failed fragment ->%s: eth=%04x, MRU=%d, MTU=%d.",
+			  ovs_vport_name(vport), ntohs(key->eth.type), mru,
+			  vport->dev->mtu);
+		goto err;
+	}
+
+	return;
+err:
+	kfree_skb(skb);
+}
+
+static void do_output(struct datapath *dp, struct sk_buff *skb, int out_port,
+		      struct sw_flow_key *key)
+{
+	struct vport *vport = ovs_vport_rcu(dp, out_port);
+
+	if (likely(vport)) {
+		u16 mru = OVS_CB(skb)->mru;
+		u32 cutlen = OVS_CB(skb)->cutlen;
+
+		if (unlikely(cutlen > 0)) {
+			if (skb->len - cutlen > ovs_mac_header_len(key))
+				pskb_trim(skb, skb->len - cutlen);
+			else
+				pskb_trim(skb, ovs_mac_header_len(key));
+		}
+
+		if (likely(!mru ||
+		           (skb->len <= mru + vport->dev->hard_header_len))) {
+			ovs_vport_send(vport, skb, ovs_key_mac_proto(key));
+		} else if (mru <= vport->dev->mtu) {
+			struct net *net = read_pnet(&dp->net);
+
+			ovs_fragment(net, vport, skb, mru, key);
+		} else {
+			kfree_skb(skb);
+		}
+	} else {
+		kfree_skb(skb);
+	}
+}
+
+static int output_userspace(struct datapath *dp, struct sk_buff *skb,
+			    struct sw_flow_key *key, const struct nlattr *attr,
+			    const struct nlattr *actions, int actions_len,
+			    uint32_t cutlen)
+{
+	struct dp_upcall_info upcall;
+	const struct nlattr *a;
+	int rem;
+
+	memset(&upcall, 0, sizeof(upcall));
+	upcall.cmd = OVS_PACKET_CMD_ACTION;
+	upcall.mru = OVS_CB(skb)->mru;
+
+	for (a = nla_data(attr), rem = nla_len(attr); rem > 0;
+		 a = nla_next(a, &rem)) {
+		switch (nla_type(a)) {
+		case OVS_USERSPACE_ATTR_USERDATA:
+			upcall.userdata = a;
+			break;
+
+		case OVS_USERSPACE_ATTR_PID:
+			upcall.portid = nla_get_u32(a);
+			break;
+
+		case OVS_USERSPACE_ATTR_EGRESS_TUN_PORT: {
+			/* Get out tunnel info. */
+			struct vport *vport;
+
+			vport = ovs_vport_rcu(dp, nla_get_u32(a));
+			if (vport) {
+				int err;
+
+				err = dev_fill_metadata_dst(vport->dev, skb);
+				if (!err)
+					upcall.egress_tun_info = skb_tunnel_info(skb);
+			}
+
+			break;
+		}
+
+		case OVS_USERSPACE_ATTR_ACTIONS: {
+			/* Include actions. */
+			upcall.actions = actions;
+			upcall.actions_len = actions_len;
+			break;
+		}
+
+		} /* End of switch. */
+	}
+
+	return ovs_dp_upcall(dp, skb, key, &upcall, cutlen);
+}
+
+/* When 'last' is true, sample() should always consume the 'skb'.
+ * Otherwise, sample() should keep 'skb' intact regardless what
+ * actions are executed within sample().
+ */
+static int sample(struct datapath *dp, struct sk_buff *skb,
+		  struct sw_flow_key *key, const struct nlattr *attr,
+		  bool last)
+{
+	struct nlattr *actions;
+	struct nlattr *sample_arg;
+	int rem = nla_len(attr);
+	const struct sample_arg *arg;
+	bool clone_flow_key;
+
+	/* The first action is always 'OVS_SAMPLE_ATTR_ARG'. */
+	sample_arg = nla_data(attr);
+	arg = nla_data(sample_arg);
+	actions = nla_next(sample_arg, &rem);
+
+	if ((arg->probability != U32_MAX) &&
+	    (!arg->probability || prandom_u32() > arg->probability)) {
+		if (last)
+			consume_skb(skb);
+		return 0;
+	}
+
+	clone_flow_key = !arg->exec;
+	return clone_execute(dp, skb, key, 0, actions, rem, last,
+			     clone_flow_key);
+}
+
+/* When 'last' is true, clone() should always consume the 'skb'.
+ * Otherwise, clone() should keep 'skb' intact regardless what
+ * actions are executed within clone().
+ */
+static int clone(struct datapath *dp, struct sk_buff *skb,
+		 struct sw_flow_key *key, const struct nlattr *attr,
+		 bool last)
+{
+	struct nlattr *actions;
+	struct nlattr *clone_arg;
+	int rem = nla_len(attr);
+	bool dont_clone_flow_key;
+
+	/* The first action is always 'OVS_CLONE_ATTR_EXEC'. */
+	clone_arg = nla_data(attr);
+	dont_clone_flow_key = nla_get_u32(clone_arg);
+	actions = nla_next(clone_arg, &rem);
+
+	return clone_execute(dp, skb, key, 0, actions, rem, last,
+			     !dont_clone_flow_key);
+}
+
+static void execute_hash(struct sk_buff *skb, struct sw_flow_key *key,
+			 const struct nlattr *attr)
+{
+	struct ovs_action_hash *hash_act = nla_data(attr);
+	u32 hash = 0;
+
+	/* OVS_HASH_ALG_L4 is the only possible hash algorithm.  */
+	hash = skb_get_hash(skb);
+	hash = jhash_1word(hash, hash_act->hash_basis);
+	if (!hash)
+		hash = 0x1;
+
+	key->ovs_flow_hash = hash;
+}
+
+static int execute_set_action(struct sk_buff *skb,
+			      struct sw_flow_key *flow_key,
+			      const struct nlattr *a)
+{
+	/* Only tunnel set execution is supported without a mask. */
+	if (nla_type(a) == OVS_KEY_ATTR_TUNNEL_INFO) {
+		struct ovs_tunnel_info *tun = nla_data(a);
+
+		skb_dst_drop(skb);
+		dst_hold((struct dst_entry *)tun->tun_dst);
+		skb_dst_set(skb, (struct dst_entry *)tun->tun_dst);
+		return 0;
+	}
+
+	return -EINVAL;
+}
+
+/* Mask is at the midpoint of the data. */
+#define get_mask(a, type) ((const type)nla_data(a) + 1)
+
+static int execute_masked_set_action(struct sk_buff *skb,
+				     struct sw_flow_key *flow_key,
+				     const struct nlattr *a)
+{
+	int err = 0;
+
+	switch (nla_type(a)) {
+	case OVS_KEY_ATTR_PRIORITY:
+		OVS_SET_MASKED(skb->priority, nla_get_u32(a),
+			       *get_mask(a, u32 *));
+		flow_key->phy.priority = skb->priority;
+		break;
+
+	case OVS_KEY_ATTR_SKB_MARK:
+		OVS_SET_MASKED(skb->mark, nla_get_u32(a), *get_mask(a, u32 *));
+		flow_key->phy.skb_mark = skb->mark;
+		break;
+
+	case OVS_KEY_ATTR_TUNNEL_INFO:
+		/* Masked data not supported for tunnel. */
+		err = -EINVAL;
+		break;
+
+	case OVS_KEY_ATTR_ETHERNET:
+		err = set_eth_addr(skb, flow_key, nla_data(a),
+				   get_mask(a, struct ovs_key_ethernet *));
+		break;
+
+	case OVS_KEY_ATTR_NSH:
+		err = set_nsh(skb, flow_key, a);
+		break;
+
+	case OVS_KEY_ATTR_IPV4:
+		err = set_ipv4(skb, flow_key, nla_data(a),
+			       get_mask(a, struct ovs_key_ipv4 *));
+		break;
+
+	case OVS_KEY_ATTR_IPV6:
+		err = set_ipv6(skb, flow_key, nla_data(a),
+			       get_mask(a, struct ovs_key_ipv6 *));
+		break;
+
+	case OVS_KEY_ATTR_TCP:
+		err = set_tcp(skb, flow_key, nla_data(a),
+			      get_mask(a, struct ovs_key_tcp *));
+		break;
+
+	case OVS_KEY_ATTR_UDP:
+		err = set_udp(skb, flow_key, nla_data(a),
+			      get_mask(a, struct ovs_key_udp *));
+		break;
+
+	case OVS_KEY_ATTR_SCTP:
+		err = set_sctp(skb, flow_key, nla_data(a),
+			       get_mask(a, struct ovs_key_sctp *));
+		break;
+
+	case OVS_KEY_ATTR_MPLS:
+		err = set_mpls(skb, flow_key, nla_data(a), get_mask(a,
+								    __be32 *));
+		break;
+
+	case OVS_KEY_ATTR_CT_STATE:
+	case OVS_KEY_ATTR_CT_ZONE:
+	case OVS_KEY_ATTR_CT_MARK:
+	case OVS_KEY_ATTR_CT_LABELS:
+	case OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV4:
+	case OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV6:
+		err = -EINVAL;
+		break;
+	}
+
+	return err;
+}
+
+static int execute_recirc(struct datapath *dp, struct sk_buff *skb,
+			  struct sw_flow_key *key,
+			  const struct nlattr *a, bool last)
+{
+	u32 recirc_id;
+
+	if (!is_flow_key_valid(key)) {
+		int err;
+
+		err = ovs_flow_key_update(skb, key);
+		if (err)
+			return err;
+	}
+	BUG_ON(!is_flow_key_valid(key));
+
+	recirc_id = nla_get_u32(a);
+	return clone_execute(dp, skb, key, recirc_id, NULL, 0, last, true);
+}
+
+/* Execute a list of actions against 'skb'. */
+static int do_execute_actions(struct datapath *dp, struct sk_buff *skb,
+			      struct sw_flow_key *key,
+			      const struct nlattr *attr, int len)
+{
+	const struct nlattr *a;
+	int rem;
+
+	for (a = attr, rem = len; rem > 0;
+	     a = nla_next(a, &rem)) {
+		int err = 0;
+
+		switch (nla_type(a)) {
+		case OVS_ACTION_ATTR_OUTPUT: {
+			int port = nla_get_u32(a);
+			struct sk_buff *clone;
+
+			/* Every output action needs a separate clone
+			 * of 'skb', In case the output action is the
+			 * last action, cloning can be avoided.
+			 */
+			if (nla_is_last(a, rem)) {
+				do_output(dp, skb, port, key);
+				/* 'skb' has been used for output.
+				 */
+				return 0;
+			}
+
+			clone = skb_clone(skb, GFP_ATOMIC);
+			if (clone)
+				do_output(dp, clone, port, key);
+			OVS_CB(skb)->cutlen = 0;
+			break;
+		}
+
+		case OVS_ACTION_ATTR_TRUNC: {
+			struct ovs_action_trunc *trunc = nla_data(a);
+
+			if (skb->len > trunc->max_len)
+				OVS_CB(skb)->cutlen = skb->len - trunc->max_len;
+			break;
+		}
+
+		case OVS_ACTION_ATTR_USERSPACE:
+			output_userspace(dp, skb, key, a, attr,
+						     len, OVS_CB(skb)->cutlen);
+			OVS_CB(skb)->cutlen = 0;
+			break;
+
+		case OVS_ACTION_ATTR_HASH:
+			execute_hash(skb, key, a);
+			break;
+
+		case OVS_ACTION_ATTR_PUSH_MPLS:
+			err = push_mpls(skb, key, nla_data(a));
+			break;
+
+		case OVS_ACTION_ATTR_POP_MPLS:
+			err = pop_mpls(skb, key, nla_get_be16(a));
+			break;
+
+		case OVS_ACTION_ATTR_PUSH_VLAN:
+			err = push_vlan(skb, key, nla_data(a));
+			break;
+
+		case OVS_ACTION_ATTR_POP_VLAN:
+			err = pop_vlan(skb, key);
+			break;
+
+		case OVS_ACTION_ATTR_RECIRC: {
+			bool last = nla_is_last(a, rem);
+
+			err = execute_recirc(dp, skb, key, a, last);
+			if (last) {
+				/* If this is the last action, the skb has
+				 * been consumed or freed.
+				 * Return immediately.
+				 */
+				return err;
+			}
+			break;
+		}
+
+		case OVS_ACTION_ATTR_SET:
+			err = execute_set_action(skb, key, nla_data(a));
+			break;
+
+		case OVS_ACTION_ATTR_SET_MASKED:
+		case OVS_ACTION_ATTR_SET_TO_MASKED:
+			err = execute_masked_set_action(skb, key, nla_data(a));
+			break;
+
+		case OVS_ACTION_ATTR_SAMPLE: {
+			bool last = nla_is_last(a, rem);
+
+			err = sample(dp, skb, key, a, last);
+			if (last)
+				return err;
+
+			break;
+		}
+
+		case OVS_ACTION_ATTR_CT:
+			if (!is_flow_key_valid(key)) {
+				err = ovs_flow_key_update(skb, key);
+				if (err)
+					return err;
+			}
+
+			err = ovs_ct_execute(ovs_dp_get_net(dp), skb, key,
+					     nla_data(a));
+
+			/* Hide stolen IP fragments from user space. */
+			if (err)
+				return err == -EINPROGRESS ? 0 : err;
+			break;
+
+		case OVS_ACTION_ATTR_CT_CLEAR:
+			err = ovs_ct_clear(skb, key);
+			break;
+
+		case OVS_ACTION_ATTR_PUSH_ETH:
+			err = push_eth(skb, key, nla_data(a));
+			break;
+
+		case OVS_ACTION_ATTR_POP_ETH:
+			err = pop_eth(skb, key);
+			break;
+
+		case OVS_ACTION_ATTR_PUSH_NSH: {
+			u8 buffer[NSH_HDR_MAX_LEN];
+			struct nshhdr *nh = (struct nshhdr *)buffer;
+
+			err = nsh_hdr_from_nlattr(nla_data(a), nh,
+						  NSH_HDR_MAX_LEN);
+			if (unlikely(err))
+				break;
+			err = push_nsh(skb, key, nh);
+			break;
+		}
+
+		case OVS_ACTION_ATTR_POP_NSH:
+			err = pop_nsh(skb, key);
+			break;
+
+		case OVS_ACTION_ATTR_METER:
+			if (ovs_meter_execute(dp, skb, key, nla_get_u32(a))) {
+				consume_skb(skb);
+				return 0;
+			}
+			break;
+
+		case OVS_ACTION_ATTR_CLONE: {
+			bool last = nla_is_last(a, rem);
+
+			err = clone(dp, skb, key, a, last);
+			if (last)
+				return err;
+
+			break;
+		}
+		}
+
+		if (unlikely(err)) {
+			kfree_skb(skb);
+			return err;
+		}
+	}
+
+	consume_skb(skb);
+	return 0;
+}
+
+/* Execute the actions on the clone of the packet. The effect of the
+ * execution does not affect the original 'skb' nor the original 'key'.
+ *
+ * The execution may be deferred in case the actions can not be executed
+ * immediately.
+ */
+static int clone_execute(struct datapath *dp, struct sk_buff *skb,
+			 struct sw_flow_key *key, u32 recirc_id,
+			 const struct nlattr *actions, int len,
+			 bool last, bool clone_flow_key)
+{
+	struct deferred_action *da;
+	struct sw_flow_key *clone;
+
+	skb = last ? skb : skb_clone(skb, GFP_ATOMIC);
+	if (!skb) {
+		/* Out of memory, skip this action.
+		 */
+		return 0;
+	}
+
+	/* When clone_flow_key is false, the 'key' will not be change
+	 * by the actions, then the 'key' can be used directly.
+	 * Otherwise, try to clone key from the next recursion level of
+	 * 'flow_keys'. If clone is successful, execute the actions
+	 * without deferring.
+	 */
+	clone = clone_flow_key ? clone_key(key) : key;
+	if (clone) {
+		int err = 0;
+
+		if (actions) { /* Sample action */
+			if (clone_flow_key)
+				__this_cpu_inc(exec_actions_level);
+
+			err = do_execute_actions(dp, skb, clone,
+						 actions, len);
+
+			if (clone_flow_key)
+				__this_cpu_dec(exec_actions_level);
+		} else { /* Recirc action */
+			clone->recirc_id = recirc_id;
+			ovs_dp_process_packet(skb, clone);
+		}
+		return err;
+	}
+
+	/* Out of 'flow_keys' space. Defer actions */
+	da = add_deferred_actions(skb, key, actions, len);
+	if (da) {
+		if (!actions) { /* Recirc action */
+			key = &da->pkt_key;
+			key->recirc_id = recirc_id;
+		}
+	} else {
+		/* Out of per CPU action FIFO space. Drop the 'skb' and
+		 * log an error.
+		 */
+		kfree_skb(skb);
+
+		if (net_ratelimit()) {
+			if (actions) { /* Sample action */
+				pr_warn("%s: deferred action limit reached, drop sample action\n",
+					ovs_dp_name(dp));
+			} else {  /* Recirc action */
+				pr_warn("%s: deferred action limit reached, drop recirc action\n",
+					ovs_dp_name(dp));
+			}
+		}
+	}
+	return 0;
+}
+
+static void process_deferred_actions(struct datapath *dp)
+{
+	struct action_fifo *fifo = this_cpu_ptr(action_fifos);
+
+	/* Do not touch the FIFO in case there is no deferred actions. */
+	if (action_fifo_is_empty(fifo))
+		return;
+
+	/* Finishing executing all deferred actions. */
+	do {
+		struct deferred_action *da = action_fifo_get(fifo);
+		struct sk_buff *skb = da->skb;
+		struct sw_flow_key *key = &da->pkt_key;
+		const struct nlattr *actions = da->actions;
+		int actions_len = da->actions_len;
+
+		if (actions)
+			do_execute_actions(dp, skb, key, actions, actions_len);
+		else
+			ovs_dp_process_packet(skb, key);
+	} while (!action_fifo_is_empty(fifo));
+
+	/* Reset FIFO for the next packet.  */
+	action_fifo_init(fifo);
+}
+
+/* Execute a list of actions against 'skb'. */
+int ovs_execute_actions(struct datapath *dp, struct sk_buff *skb,
+			const struct sw_flow_actions *acts,
+			struct sw_flow_key *key)
+{
+	int err, level;
+
+	level = __this_cpu_inc_return(exec_actions_level);
+	if (unlikely(level > OVS_RECURSION_LIMIT)) {
+		net_crit_ratelimited("ovs: recursion limit reached on datapath %s, probable configuration error\n",
+				     ovs_dp_name(dp));
+		kfree_skb(skb);
+		err = -ENETDOWN;
+		goto out;
+	}
+
+	OVS_CB(skb)->acts_origlen = acts->orig_len;
+	err = do_execute_actions(dp, skb, key,
+				 acts->actions, acts->actions_len);
+
+	if (level == 1)
+		process_deferred_actions(dp);
+
+out:
+	__this_cpu_dec(exec_actions_level);
+	return err;
+}
+
+int action_fifos_init(void)
+{
+	action_fifos = alloc_percpu(struct action_fifo);
+	if (!action_fifos)
+		return -ENOMEM;
+
+	flow_keys = alloc_percpu(struct action_flow_keys);
+	if (!flow_keys) {
+		free_percpu(action_fifos);
+		return -ENOMEM;
+	}
+
+	return 0;
+}
+
+void action_fifos_exit(void)
+{
+	free_percpu(action_fifos);
+	free_percpu(flow_keys);
+}
diff --git a/net/openvswitch/conntrack.c b/net/openvswitch/conntrack.c
new file mode 100644
index 000000000..0777c8d41
--- /dev/null
+++ b/net/openvswitch/conntrack.c
@@ -0,0 +1,2237 @@
+/*
+ * Copyright (c) 2015 Nicira, Inc.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of version 2 of the GNU General Public
+ * License as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ */
+
+#include <linux/module.h>
+#include <linux/openvswitch.h>
+#include <linux/tcp.h>
+#include <linux/udp.h>
+#include <linux/sctp.h>
+#include <linux/static_key.h>
+#include <net/ip.h>
+#include <net/genetlink.h>
+#include <net/netfilter/nf_conntrack_core.h>
+#include <net/netfilter/nf_conntrack_count.h>
+#include <net/netfilter/nf_conntrack_helper.h>
+#include <net/netfilter/nf_conntrack_labels.h>
+#include <net/netfilter/nf_conntrack_seqadj.h>
+#include <net/netfilter/nf_conntrack_zones.h>
+#include <net/netfilter/ipv6/nf_defrag_ipv6.h>
+#include <net/ipv6_frag.h>
+
+#ifdef CONFIG_NF_NAT_NEEDED
+#include <linux/netfilter/nf_nat.h>
+#include <net/netfilter/nf_nat_core.h>
+#include <net/netfilter/nf_nat_l3proto.h>
+#endif
+
+#include "datapath.h"
+#include "conntrack.h"
+#include "flow.h"
+#include "flow_netlink.h"
+
+struct ovs_ct_len_tbl {
+	int maxlen;
+	int minlen;
+};
+
+/* Metadata mark for masked write to conntrack mark */
+struct md_mark {
+	u32 value;
+	u32 mask;
+};
+
+/* Metadata label for masked write to conntrack label. */
+struct md_labels {
+	struct ovs_key_ct_labels value;
+	struct ovs_key_ct_labels mask;
+};
+
+enum ovs_ct_nat {
+	OVS_CT_NAT = 1 << 0,     /* NAT for committed connections only. */
+	OVS_CT_SRC_NAT = 1 << 1, /* Source NAT for NEW connections. */
+	OVS_CT_DST_NAT = 1 << 2, /* Destination NAT for NEW connections. */
+};
+
+/* Conntrack action context for execution. */
+struct ovs_conntrack_info {
+	struct nf_conntrack_helper *helper;
+	struct nf_conntrack_zone zone;
+	struct nf_conn *ct;
+	u8 commit : 1;
+	u8 nat : 3;                 /* enum ovs_ct_nat */
+	u8 force : 1;
+	u8 have_eventmask : 1;
+	u16 family;
+	u32 eventmask;              /* Mask of 1 << IPCT_*. */
+	struct md_mark mark;
+	struct md_labels labels;
+#ifdef CONFIG_NF_NAT_NEEDED
+	struct nf_nat_range2 range;  /* Only present for SRC NAT and DST NAT. */
+#endif
+};
+
+#if	IS_ENABLED(CONFIG_NETFILTER_CONNCOUNT)
+#define OVS_CT_LIMIT_UNLIMITED	0
+#define OVS_CT_LIMIT_DEFAULT OVS_CT_LIMIT_UNLIMITED
+#define CT_LIMIT_HASH_BUCKETS 512
+static DEFINE_STATIC_KEY_FALSE(ovs_ct_limit_enabled);
+
+struct ovs_ct_limit {
+	/* Elements in ovs_ct_limit_info->limits hash table */
+	struct hlist_node hlist_node;
+	struct rcu_head rcu;
+	u16 zone;
+	u32 limit;
+};
+
+struct ovs_ct_limit_info {
+	u32 default_limit;
+	struct hlist_head *limits;
+	struct nf_conncount_data *data;
+};
+
+static const struct nla_policy ct_limit_policy[OVS_CT_LIMIT_ATTR_MAX + 1] = {
+	[OVS_CT_LIMIT_ATTR_ZONE_LIMIT] = { .type = NLA_NESTED, },
+};
+#endif
+
+static bool labels_nonzero(const struct ovs_key_ct_labels *labels);
+
+static void __ovs_ct_free_action(struct ovs_conntrack_info *ct_info);
+
+static u16 key_to_nfproto(const struct sw_flow_key *key)
+{
+	switch (ntohs(key->eth.type)) {
+	case ETH_P_IP:
+		return NFPROTO_IPV4;
+	case ETH_P_IPV6:
+		return NFPROTO_IPV6;
+	default:
+		return NFPROTO_UNSPEC;
+	}
+}
+
+/* Map SKB connection state into the values used by flow definition. */
+static u8 ovs_ct_get_state(enum ip_conntrack_info ctinfo)
+{
+	u8 ct_state = OVS_CS_F_TRACKED;
+
+	switch (ctinfo) {
+	case IP_CT_ESTABLISHED_REPLY:
+	case IP_CT_RELATED_REPLY:
+		ct_state |= OVS_CS_F_REPLY_DIR;
+		break;
+	default:
+		break;
+	}
+
+	switch (ctinfo) {
+	case IP_CT_ESTABLISHED:
+	case IP_CT_ESTABLISHED_REPLY:
+		ct_state |= OVS_CS_F_ESTABLISHED;
+		break;
+	case IP_CT_RELATED:
+	case IP_CT_RELATED_REPLY:
+		ct_state |= OVS_CS_F_RELATED;
+		break;
+	case IP_CT_NEW:
+		ct_state |= OVS_CS_F_NEW;
+		break;
+	default:
+		break;
+	}
+
+	return ct_state;
+}
+
+static u32 ovs_ct_get_mark(const struct nf_conn *ct)
+{
+#if IS_ENABLED(CONFIG_NF_CONNTRACK_MARK)
+	return ct ? ct->mark : 0;
+#else
+	return 0;
+#endif
+}
+
+/* Guard against conntrack labels max size shrinking below 128 bits. */
+#if NF_CT_LABELS_MAX_SIZE < 16
+#error NF_CT_LABELS_MAX_SIZE must be at least 16 bytes
+#endif
+
+static void ovs_ct_get_labels(const struct nf_conn *ct,
+			      struct ovs_key_ct_labels *labels)
+{
+	struct nf_conn_labels *cl = ct ? nf_ct_labels_find(ct) : NULL;
+
+	if (cl)
+		memcpy(labels, cl->bits, OVS_CT_LABELS_LEN);
+	else
+		memset(labels, 0, OVS_CT_LABELS_LEN);
+}
+
+static void __ovs_ct_update_key_orig_tp(struct sw_flow_key *key,
+					const struct nf_conntrack_tuple *orig,
+					u8 icmp_proto)
+{
+	key->ct_orig_proto = orig->dst.protonum;
+	if (orig->dst.protonum == icmp_proto) {
+		key->ct.orig_tp.src = htons(orig->dst.u.icmp.type);
+		key->ct.orig_tp.dst = htons(orig->dst.u.icmp.code);
+	} else {
+		key->ct.orig_tp.src = orig->src.u.all;
+		key->ct.orig_tp.dst = orig->dst.u.all;
+	}
+}
+
+static void __ovs_ct_update_key(struct sw_flow_key *key, u8 state,
+				const struct nf_conntrack_zone *zone,
+				const struct nf_conn *ct)
+{
+	key->ct_state = state;
+	key->ct_zone = zone->id;
+	key->ct.mark = ovs_ct_get_mark(ct);
+	ovs_ct_get_labels(ct, &key->ct.labels);
+
+	if (ct) {
+		const struct nf_conntrack_tuple *orig;
+
+		/* Use the master if we have one. */
+		if (ct->master)
+			ct = ct->master;
+		orig = &ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple;
+
+		/* IP version must match with the master connection. */
+		if (key->eth.type == htons(ETH_P_IP) &&
+		    nf_ct_l3num(ct) == NFPROTO_IPV4) {
+			key->ipv4.ct_orig.src = orig->src.u3.ip;
+			key->ipv4.ct_orig.dst = orig->dst.u3.ip;
+			__ovs_ct_update_key_orig_tp(key, orig, IPPROTO_ICMP);
+			return;
+		} else if (key->eth.type == htons(ETH_P_IPV6) &&
+			   !sw_flow_key_is_nd(key) &&
+			   nf_ct_l3num(ct) == NFPROTO_IPV6) {
+			key->ipv6.ct_orig.src = orig->src.u3.in6;
+			key->ipv6.ct_orig.dst = orig->dst.u3.in6;
+			__ovs_ct_update_key_orig_tp(key, orig, NEXTHDR_ICMP);
+			return;
+		}
+	}
+	/* Clear 'ct_orig_proto' to mark the non-existence of conntrack
+	 * original direction key fields.
+	 */
+	key->ct_orig_proto = 0;
+}
+
+/* Update 'key' based on skb->_nfct.  If 'post_ct' is true, then OVS has
+ * previously sent the packet to conntrack via the ct action.  If
+ * 'keep_nat_flags' is true, the existing NAT flags retained, else they are
+ * initialized from the connection status.
+ */
+static void ovs_ct_update_key(const struct sk_buff *skb,
+			      const struct ovs_conntrack_info *info,
+			      struct sw_flow_key *key, bool post_ct,
+			      bool keep_nat_flags)
+{
+	const struct nf_conntrack_zone *zone = &nf_ct_zone_dflt;
+	enum ip_conntrack_info ctinfo;
+	struct nf_conn *ct;
+	u8 state = 0;
+
+	ct = nf_ct_get(skb, &ctinfo);
+	if (ct) {
+		state = ovs_ct_get_state(ctinfo);
+		/* All unconfirmed entries are NEW connections. */
+		if (!nf_ct_is_confirmed(ct))
+			state |= OVS_CS_F_NEW;
+		/* OVS persists the related flag for the duration of the
+		 * connection.
+		 */
+		if (ct->master)
+			state |= OVS_CS_F_RELATED;
+		if (keep_nat_flags) {
+			state |= key->ct_state & OVS_CS_F_NAT_MASK;
+		} else {
+			if (ct->status & IPS_SRC_NAT)
+				state |= OVS_CS_F_SRC_NAT;
+			if (ct->status & IPS_DST_NAT)
+				state |= OVS_CS_F_DST_NAT;
+		}
+		zone = nf_ct_zone(ct);
+	} else if (post_ct) {
+		state = OVS_CS_F_TRACKED | OVS_CS_F_INVALID;
+		if (info)
+			zone = &info->zone;
+	}
+	__ovs_ct_update_key(key, state, zone, ct);
+}
+
+/* This is called to initialize CT key fields possibly coming in from the local
+ * stack.
+ */
+void ovs_ct_fill_key(const struct sk_buff *skb, struct sw_flow_key *key)
+{
+	ovs_ct_update_key(skb, NULL, key, false, false);
+}
+
+int ovs_ct_put_key(const struct sw_flow_key *swkey,
+		   const struct sw_flow_key *output, struct sk_buff *skb)
+{
+	if (nla_put_u32(skb, OVS_KEY_ATTR_CT_STATE, output->ct_state))
+		return -EMSGSIZE;
+
+	if (IS_ENABLED(CONFIG_NF_CONNTRACK_ZONES) &&
+	    nla_put_u16(skb, OVS_KEY_ATTR_CT_ZONE, output->ct_zone))
+		return -EMSGSIZE;
+
+	if (IS_ENABLED(CONFIG_NF_CONNTRACK_MARK) &&
+	    nla_put_u32(skb, OVS_KEY_ATTR_CT_MARK, output->ct.mark))
+		return -EMSGSIZE;
+
+	if (IS_ENABLED(CONFIG_NF_CONNTRACK_LABELS) &&
+	    nla_put(skb, OVS_KEY_ATTR_CT_LABELS, sizeof(output->ct.labels),
+		    &output->ct.labels))
+		return -EMSGSIZE;
+
+	if (swkey->ct_orig_proto) {
+		if (swkey->eth.type == htons(ETH_P_IP)) {
+			struct ovs_key_ct_tuple_ipv4 orig;
+
+			memset(&orig, 0, sizeof(orig));
+			orig.ipv4_src = output->ipv4.ct_orig.src;
+			orig.ipv4_dst = output->ipv4.ct_orig.dst;
+			orig.src_port = output->ct.orig_tp.src;
+			orig.dst_port = output->ct.orig_tp.dst;
+			orig.ipv4_proto = output->ct_orig_proto;
+
+			if (nla_put(skb, OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV4,
+				    sizeof(orig), &orig))
+				return -EMSGSIZE;
+		} else if (swkey->eth.type == htons(ETH_P_IPV6)) {
+			struct ovs_key_ct_tuple_ipv6 orig;
+
+			memset(&orig, 0, sizeof(orig));
+			memcpy(orig.ipv6_src, output->ipv6.ct_orig.src.s6_addr32,
+			       sizeof(orig.ipv6_src));
+			memcpy(orig.ipv6_dst, output->ipv6.ct_orig.dst.s6_addr32,
+			       sizeof(orig.ipv6_dst));
+			orig.src_port = output->ct.orig_tp.src;
+			orig.dst_port = output->ct.orig_tp.dst;
+			orig.ipv6_proto = output->ct_orig_proto;
+
+			if (nla_put(skb, OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV6,
+				    sizeof(orig), &orig))
+				return -EMSGSIZE;
+		}
+	}
+
+	return 0;
+}
+
+static int ovs_ct_set_mark(struct nf_conn *ct, struct sw_flow_key *key,
+			   u32 ct_mark, u32 mask)
+{
+#if IS_ENABLED(CONFIG_NF_CONNTRACK_MARK)
+	u32 new_mark;
+
+	new_mark = ct_mark | (ct->mark & ~(mask));
+	if (ct->mark != new_mark) {
+		ct->mark = new_mark;
+		if (nf_ct_is_confirmed(ct))
+			nf_conntrack_event_cache(IPCT_MARK, ct);
+		key->ct.mark = new_mark;
+	}
+
+	return 0;
+#else
+	return -ENOTSUPP;
+#endif
+}
+
+static struct nf_conn_labels *ovs_ct_get_conn_labels(struct nf_conn *ct)
+{
+	struct nf_conn_labels *cl;
+
+	cl = nf_ct_labels_find(ct);
+	if (!cl) {
+		nf_ct_labels_ext_add(ct);
+		cl = nf_ct_labels_find(ct);
+	}
+
+	return cl;
+}
+
+/* Initialize labels for a new, yet to be committed conntrack entry.  Note that
+ * since the new connection is not yet confirmed, and thus no-one else has
+ * access to it's labels, we simply write them over.
+ */
+static int ovs_ct_init_labels(struct nf_conn *ct, struct sw_flow_key *key,
+			      const struct ovs_key_ct_labels *labels,
+			      const struct ovs_key_ct_labels *mask)
+{
+	struct nf_conn_labels *cl, *master_cl;
+	bool have_mask = labels_nonzero(mask);
+
+	/* Inherit master's labels to the related connection? */
+	master_cl = ct->master ? nf_ct_labels_find(ct->master) : NULL;
+
+	if (!master_cl && !have_mask)
+		return 0;   /* Nothing to do. */
+
+	cl = ovs_ct_get_conn_labels(ct);
+	if (!cl)
+		return -ENOSPC;
+
+	/* Inherit the master's labels, if any. */
+	if (master_cl)
+		*cl = *master_cl;
+
+	if (have_mask) {
+		u32 *dst = (u32 *)cl->bits;
+		int i;
+
+		for (i = 0; i < OVS_CT_LABELS_LEN_32; i++)
+			dst[i] = (dst[i] & ~mask->ct_labels_32[i]) |
+				(labels->ct_labels_32[i]
+				 & mask->ct_labels_32[i]);
+	}
+
+	/* Labels are included in the IPCTNL_MSG_CT_NEW event only if the
+	 * IPCT_LABEL bit is set in the event cache.
+	 */
+	nf_conntrack_event_cache(IPCT_LABEL, ct);
+
+	memcpy(&key->ct.labels, cl->bits, OVS_CT_LABELS_LEN);
+
+	return 0;
+}
+
+static int ovs_ct_set_labels(struct nf_conn *ct, struct sw_flow_key *key,
+			     const struct ovs_key_ct_labels *labels,
+			     const struct ovs_key_ct_labels *mask)
+{
+	struct nf_conn_labels *cl;
+	int err;
+
+	cl = ovs_ct_get_conn_labels(ct);
+	if (!cl)
+		return -ENOSPC;
+
+	err = nf_connlabels_replace(ct, labels->ct_labels_32,
+				    mask->ct_labels_32,
+				    OVS_CT_LABELS_LEN_32);
+	if (err)
+		return err;
+
+	memcpy(&key->ct.labels, cl->bits, OVS_CT_LABELS_LEN);
+
+	return 0;
+}
+
+/* 'skb' should already be pulled to nh_ofs. */
+static int ovs_ct_helper(struct sk_buff *skb, u16 proto)
+{
+	const struct nf_conntrack_helper *helper;
+	const struct nf_conn_help *help;
+	enum ip_conntrack_info ctinfo;
+	unsigned int protoff;
+	struct nf_conn *ct;
+	int err;
+
+	ct = nf_ct_get(skb, &ctinfo);
+	if (!ct || ctinfo == IP_CT_RELATED_REPLY)
+		return NF_ACCEPT;
+
+	help = nfct_help(ct);
+	if (!help)
+		return NF_ACCEPT;
+
+	helper = rcu_dereference(help->helper);
+	if (!helper)
+		return NF_ACCEPT;
+
+	switch (proto) {
+	case NFPROTO_IPV4:
+		protoff = ip_hdrlen(skb);
+		break;
+	case NFPROTO_IPV6: {
+		u8 nexthdr = ipv6_hdr(skb)->nexthdr;
+		__be16 frag_off;
+		int ofs;
+
+		ofs = ipv6_skip_exthdr(skb, sizeof(struct ipv6hdr), &nexthdr,
+				       &frag_off);
+		if (ofs < 0 || (frag_off & htons(~0x7)) != 0) {
+			pr_debug("proto header not found\n");
+			return NF_ACCEPT;
+		}
+		protoff = ofs;
+		break;
+	}
+	default:
+		WARN_ONCE(1, "helper invoked on non-IP family!");
+		return NF_DROP;
+	}
+
+	err = helper->help(skb, protoff, ct, ctinfo);
+	if (err != NF_ACCEPT)
+		return err;
+
+	/* Adjust seqs after helper.  This is needed due to some helpers (e.g.,
+	 * FTP with NAT) adusting the TCP payload size when mangling IP
+	 * addresses and/or port numbers in the text-based control connection.
+	 */
+	if (test_bit(IPS_SEQ_ADJUST_BIT, &ct->status) &&
+	    !nf_ct_seq_adjust(skb, ct, ctinfo, protoff))
+		return NF_DROP;
+	return NF_ACCEPT;
+}
+
+/* Returns 0 on success, -EINPROGRESS if 'skb' is stolen, or other nonzero
+ * value if 'skb' is freed.
+ */
+static int handle_fragments(struct net *net, struct sw_flow_key *key,
+			    u16 zone, struct sk_buff *skb)
+{
+	struct ovs_skb_cb ovs_cb = *OVS_CB(skb);
+	int err;
+
+	if (key->eth.type == htons(ETH_P_IP)) {
+		enum ip_defrag_users user = IP_DEFRAG_CONNTRACK_IN + zone;
+
+		memset(IPCB(skb), 0, sizeof(struct inet_skb_parm));
+		err = ip_defrag(net, skb, user);
+		if (err)
+			return err;
+
+		ovs_cb.mru = IPCB(skb)->frag_max_size;
+#if IS_ENABLED(CONFIG_NF_DEFRAG_IPV6)
+	} else if (key->eth.type == htons(ETH_P_IPV6)) {
+		enum ip6_defrag_users user = IP6_DEFRAG_CONNTRACK_IN + zone;
+
+		memset(IP6CB(skb), 0, sizeof(struct inet6_skb_parm));
+		err = nf_ct_frag6_gather(net, skb, user);
+		if (err) {
+			if (err != -EINPROGRESS)
+				kfree_skb(skb);
+			return err;
+		}
+
+		key->ip.proto = ipv6_hdr(skb)->nexthdr;
+		ovs_cb.mru = IP6CB(skb)->frag_max_size;
+#endif
+	} else {
+		kfree_skb(skb);
+		return -EPFNOSUPPORT;
+	}
+
+	key->ip.frag = OVS_FRAG_TYPE_NONE;
+	skb_clear_hash(skb);
+	skb->ignore_df = 1;
+	*OVS_CB(skb) = ovs_cb;
+
+	return 0;
+}
+
+static struct nf_conntrack_expect *
+ovs_ct_expect_find(struct net *net, const struct nf_conntrack_zone *zone,
+		   u16 proto, const struct sk_buff *skb)
+{
+	struct nf_conntrack_tuple tuple;
+	struct nf_conntrack_expect *exp;
+
+	if (!nf_ct_get_tuplepr(skb, skb_network_offset(skb), proto, net, &tuple))
+		return NULL;
+
+	exp = __nf_ct_expect_find(net, zone, &tuple);
+	if (exp) {
+		struct nf_conntrack_tuple_hash *h;
+
+		/* Delete existing conntrack entry, if it clashes with the
+		 * expectation.  This can happen since conntrack ALGs do not
+		 * check for clashes between (new) expectations and existing
+		 * conntrack entries.  nf_conntrack_in() will check the
+		 * expectations only if a conntrack entry can not be found,
+		 * which can lead to OVS finding the expectation (here) in the
+		 * init direction, but which will not be removed by the
+		 * nf_conntrack_in() call, if a matching conntrack entry is
+		 * found instead.  In this case all init direction packets
+		 * would be reported as new related packets, while reply
+		 * direction packets would be reported as un-related
+		 * established packets.
+		 */
+		h = nf_conntrack_find_get(net, zone, &tuple);
+		if (h) {
+			struct nf_conn *ct = nf_ct_tuplehash_to_ctrack(h);
+
+			nf_ct_delete(ct, 0, 0);
+			nf_conntrack_put(&ct->ct_general);
+		}
+	}
+
+	return exp;
+}
+
+/* This replicates logic from nf_conntrack_core.c that is not exported. */
+static enum ip_conntrack_info
+ovs_ct_get_info(const struct nf_conntrack_tuple_hash *h)
+{
+	const struct nf_conn *ct = nf_ct_tuplehash_to_ctrack(h);
+
+	if (NF_CT_DIRECTION(h) == IP_CT_DIR_REPLY)
+		return IP_CT_ESTABLISHED_REPLY;
+	/* Once we've had two way comms, always ESTABLISHED. */
+	if (test_bit(IPS_SEEN_REPLY_BIT, &ct->status))
+		return IP_CT_ESTABLISHED;
+	if (test_bit(IPS_EXPECTED_BIT, &ct->status))
+		return IP_CT_RELATED;
+	return IP_CT_NEW;
+}
+
+/* Find an existing connection which this packet belongs to without
+ * re-attributing statistics or modifying the connection state.  This allows an
+ * skb->_nfct lost due to an upcall to be recovered during actions execution.
+ *
+ * Must be called with rcu_read_lock.
+ *
+ * On success, populates skb->_nfct and returns the connection.  Returns NULL
+ * if there is no existing entry.
+ */
+static struct nf_conn *
+ovs_ct_find_existing(struct net *net, const struct nf_conntrack_zone *zone,
+		     u8 l3num, struct sk_buff *skb, bool natted)
+{
+	struct nf_conntrack_tuple tuple;
+	struct nf_conntrack_tuple_hash *h;
+	struct nf_conn *ct;
+
+	if (!nf_ct_get_tuplepr(skb, skb_network_offset(skb), l3num,
+			       net, &tuple)) {
+		pr_debug("ovs_ct_find_existing: Can't get tuple\n");
+		return NULL;
+	}
+
+	/* Must invert the tuple if skb has been transformed by NAT. */
+	if (natted) {
+		struct nf_conntrack_tuple inverse;
+
+		if (!nf_ct_invert_tuplepr(&inverse, &tuple)) {
+			pr_debug("ovs_ct_find_existing: Inversion failed!\n");
+			return NULL;
+		}
+		tuple = inverse;
+	}
+
+	/* look for tuple match */
+	h = nf_conntrack_find_get(net, zone, &tuple);
+	if (!h)
+		return NULL;   /* Not found. */
+
+	ct = nf_ct_tuplehash_to_ctrack(h);
+
+	/* Inverted packet tuple matches the reverse direction conntrack tuple,
+	 * select the other tuplehash to get the right 'ctinfo' bits for this
+	 * packet.
+	 */
+	if (natted)
+		h = &ct->tuplehash[!h->tuple.dst.dir];
+
+	nf_ct_set(skb, ct, ovs_ct_get_info(h));
+	return ct;
+}
+
+static
+struct nf_conn *ovs_ct_executed(struct net *net,
+				const struct sw_flow_key *key,
+				const struct ovs_conntrack_info *info,
+				struct sk_buff *skb,
+				bool *ct_executed)
+{
+	struct nf_conn *ct = NULL;
+
+	/* If no ct, check if we have evidence that an existing conntrack entry
+	 * might be found for this skb.  This happens when we lose a skb->_nfct
+	 * due to an upcall, or if the direction is being forced.  If the
+	 * connection was not confirmed, it is not cached and needs to be run
+	 * through conntrack again.
+	 */
+	*ct_executed = (key->ct_state & OVS_CS_F_TRACKED) &&
+		       !(key->ct_state & OVS_CS_F_INVALID) &&
+		       (key->ct_zone == info->zone.id);
+
+	if (*ct_executed || (!key->ct_state && info->force)) {
+		ct = ovs_ct_find_existing(net, &info->zone, info->family, skb,
+					  !!(key->ct_state &
+					  OVS_CS_F_NAT_MASK));
+	}
+
+	return ct;
+}
+
+/* Determine whether skb->_nfct is equal to the result of conntrack lookup. */
+static bool skb_nfct_cached(struct net *net,
+			    const struct sw_flow_key *key,
+			    const struct ovs_conntrack_info *info,
+			    struct sk_buff *skb)
+{
+	enum ip_conntrack_info ctinfo;
+	struct nf_conn *ct;
+	bool ct_executed = true;
+
+	ct = nf_ct_get(skb, &ctinfo);
+	if (!ct)
+		ct = ovs_ct_executed(net, key, info, skb, &ct_executed);
+
+	if (ct)
+		nf_ct_get(skb, &ctinfo);
+	else
+		return false;
+
+	if (!net_eq(net, read_pnet(&ct->ct_net)))
+		return false;
+	if (!nf_ct_zone_equal_any(info->ct, nf_ct_zone(ct)))
+		return false;
+	if (info->helper) {
+		struct nf_conn_help *help;
+
+		help = nf_ct_ext_find(ct, NF_CT_EXT_HELPER);
+		if (help && rcu_access_pointer(help->helper) != info->helper)
+			return false;
+	}
+	/* Force conntrack entry direction to the current packet? */
+	if (info->force && CTINFO2DIR(ctinfo) != IP_CT_DIR_ORIGINAL) {
+		/* Delete the conntrack entry if confirmed, else just release
+		 * the reference.
+		 */
+		if (nf_ct_is_confirmed(ct))
+			nf_ct_delete(ct, 0, 0);
+
+		nf_conntrack_put(&ct->ct_general);
+		nf_ct_set(skb, NULL, 0);
+		return false;
+	}
+
+	return ct_executed;
+}
+
+#ifdef CONFIG_NF_NAT_NEEDED
+/* Modelled after nf_nat_ipv[46]_fn().
+ * range is only used for new, uninitialized NAT state.
+ * Returns either NF_ACCEPT or NF_DROP.
+ */
+static int ovs_ct_nat_execute(struct sk_buff *skb, struct nf_conn *ct,
+			      enum ip_conntrack_info ctinfo,
+			      const struct nf_nat_range2 *range,
+			      enum nf_nat_manip_type maniptype)
+{
+	int hooknum, nh_off, err = NF_ACCEPT;
+
+	nh_off = skb_network_offset(skb);
+	skb_pull_rcsum(skb, nh_off);
+
+	/* See HOOK2MANIP(). */
+	if (maniptype == NF_NAT_MANIP_SRC)
+		hooknum = NF_INET_LOCAL_IN; /* Source NAT */
+	else
+		hooknum = NF_INET_LOCAL_OUT; /* Destination NAT */
+
+	switch (ctinfo) {
+	case IP_CT_RELATED:
+	case IP_CT_RELATED_REPLY:
+		if (IS_ENABLED(CONFIG_NF_NAT_IPV4) &&
+		    skb->protocol == htons(ETH_P_IP) &&
+		    ip_hdr(skb)->protocol == IPPROTO_ICMP) {
+			if (!nf_nat_icmp_reply_translation(skb, ct, ctinfo,
+							   hooknum))
+				err = NF_DROP;
+			goto push;
+		} else if (IS_ENABLED(CONFIG_NF_NAT_IPV6) &&
+			   skb->protocol == htons(ETH_P_IPV6)) {
+			__be16 frag_off;
+			u8 nexthdr = ipv6_hdr(skb)->nexthdr;
+			int hdrlen = ipv6_skip_exthdr(skb,
+						      sizeof(struct ipv6hdr),
+						      &nexthdr, &frag_off);
+
+			if (hdrlen >= 0 && nexthdr == IPPROTO_ICMPV6) {
+				if (!nf_nat_icmpv6_reply_translation(skb, ct,
+								     ctinfo,
+								     hooknum,
+								     hdrlen))
+					err = NF_DROP;
+				goto push;
+			}
+		}
+		/* Non-ICMP, fall thru to initialize if needed. */
+		/* fall through */
+	case IP_CT_NEW:
+		/* Seen it before?  This can happen for loopback, retrans,
+		 * or local packets.
+		 */
+		if (!nf_nat_initialized(ct, maniptype)) {
+			/* Initialize according to the NAT action. */
+			err = (range && range->flags & NF_NAT_RANGE_MAP_IPS)
+				/* Action is set up to establish a new
+				 * mapping.
+				 */
+				? nf_nat_setup_info(ct, range, maniptype)
+				: nf_nat_alloc_null_binding(ct, hooknum);
+			if (err != NF_ACCEPT)
+				goto push;
+		}
+		break;
+
+	case IP_CT_ESTABLISHED:
+	case IP_CT_ESTABLISHED_REPLY:
+		break;
+
+	default:
+		err = NF_DROP;
+		goto push;
+	}
+
+	err = nf_nat_packet(ct, ctinfo, hooknum, skb);
+push:
+	skb_push(skb, nh_off);
+	skb_postpush_rcsum(skb, skb->data, nh_off);
+
+	return err;
+}
+
+static void ovs_nat_update_key(struct sw_flow_key *key,
+			       const struct sk_buff *skb,
+			       enum nf_nat_manip_type maniptype)
+{
+	if (maniptype == NF_NAT_MANIP_SRC) {
+		__be16 src;
+
+		key->ct_state |= OVS_CS_F_SRC_NAT;
+		if (key->eth.type == htons(ETH_P_IP))
+			key->ipv4.addr.src = ip_hdr(skb)->saddr;
+		else if (key->eth.type == htons(ETH_P_IPV6))
+			memcpy(&key->ipv6.addr.src, &ipv6_hdr(skb)->saddr,
+			       sizeof(key->ipv6.addr.src));
+		else
+			return;
+
+		if (key->ip.proto == IPPROTO_UDP)
+			src = udp_hdr(skb)->source;
+		else if (key->ip.proto == IPPROTO_TCP)
+			src = tcp_hdr(skb)->source;
+		else if (key->ip.proto == IPPROTO_SCTP)
+			src = sctp_hdr(skb)->source;
+		else
+			return;
+
+		key->tp.src = src;
+	} else {
+		__be16 dst;
+
+		key->ct_state |= OVS_CS_F_DST_NAT;
+		if (key->eth.type == htons(ETH_P_IP))
+			key->ipv4.addr.dst = ip_hdr(skb)->daddr;
+		else if (key->eth.type == htons(ETH_P_IPV6))
+			memcpy(&key->ipv6.addr.dst, &ipv6_hdr(skb)->daddr,
+			       sizeof(key->ipv6.addr.dst));
+		else
+			return;
+
+		if (key->ip.proto == IPPROTO_UDP)
+			dst = udp_hdr(skb)->dest;
+		else if (key->ip.proto == IPPROTO_TCP)
+			dst = tcp_hdr(skb)->dest;
+		else if (key->ip.proto == IPPROTO_SCTP)
+			dst = sctp_hdr(skb)->dest;
+		else
+			return;
+
+		key->tp.dst = dst;
+	}
+}
+
+/* Returns NF_DROP if the packet should be dropped, NF_ACCEPT otherwise. */
+static int ovs_ct_nat(struct net *net, struct sw_flow_key *key,
+		      const struct ovs_conntrack_info *info,
+		      struct sk_buff *skb, struct nf_conn *ct,
+		      enum ip_conntrack_info ctinfo)
+{
+	enum nf_nat_manip_type maniptype;
+	int err;
+
+	/* Add NAT extension if not confirmed yet. */
+	if (!nf_ct_is_confirmed(ct) && !nf_ct_nat_ext_add(ct))
+		return NF_ACCEPT;   /* Can't NAT. */
+
+	/* Determine NAT type.
+	 * Check if the NAT type can be deduced from the tracked connection.
+	 * Make sure new expected connections (IP_CT_RELATED) are NATted only
+	 * when committing.
+	 */
+	if (info->nat & OVS_CT_NAT && ctinfo != IP_CT_NEW &&
+	    ct->status & IPS_NAT_MASK &&
+	    (ctinfo != IP_CT_RELATED || info->commit)) {
+		/* NAT an established or related connection like before. */
+		if (CTINFO2DIR(ctinfo) == IP_CT_DIR_REPLY)
+			/* This is the REPLY direction for a connection
+			 * for which NAT was applied in the forward
+			 * direction.  Do the reverse NAT.
+			 */
+			maniptype = ct->status & IPS_SRC_NAT
+				? NF_NAT_MANIP_DST : NF_NAT_MANIP_SRC;
+		else
+			maniptype = ct->status & IPS_SRC_NAT
+				? NF_NAT_MANIP_SRC : NF_NAT_MANIP_DST;
+	} else if (info->nat & OVS_CT_SRC_NAT) {
+		maniptype = NF_NAT_MANIP_SRC;
+	} else if (info->nat & OVS_CT_DST_NAT) {
+		maniptype = NF_NAT_MANIP_DST;
+	} else {
+		return NF_ACCEPT; /* Connection is not NATed. */
+	}
+	err = ovs_ct_nat_execute(skb, ct, ctinfo, &info->range, maniptype);
+
+	if (err == NF_ACCEPT && ct->status & IPS_DST_NAT) {
+		if (ct->status & IPS_SRC_NAT) {
+			if (maniptype == NF_NAT_MANIP_SRC)
+				maniptype = NF_NAT_MANIP_DST;
+			else
+				maniptype = NF_NAT_MANIP_SRC;
+
+			err = ovs_ct_nat_execute(skb, ct, ctinfo, &info->range,
+						 maniptype);
+		} else if (CTINFO2DIR(ctinfo) == IP_CT_DIR_ORIGINAL) {
+			err = ovs_ct_nat_execute(skb, ct, ctinfo, NULL,
+						 NF_NAT_MANIP_SRC);
+		}
+	}
+
+	/* Mark NAT done if successful and update the flow key. */
+	if (err == NF_ACCEPT)
+		ovs_nat_update_key(key, skb, maniptype);
+
+	return err;
+}
+#else /* !CONFIG_NF_NAT_NEEDED */
+static int ovs_ct_nat(struct net *net, struct sw_flow_key *key,
+		      const struct ovs_conntrack_info *info,
+		      struct sk_buff *skb, struct nf_conn *ct,
+		      enum ip_conntrack_info ctinfo)
+{
+	return NF_ACCEPT;
+}
+#endif
+
+/* Pass 'skb' through conntrack in 'net', using zone configured in 'info', if
+ * not done already.  Update key with new CT state after passing the packet
+ * through conntrack.
+ * Note that if the packet is deemed invalid by conntrack, skb->_nfct will be
+ * set to NULL and 0 will be returned.
+ */
+static int __ovs_ct_lookup(struct net *net, struct sw_flow_key *key,
+			   const struct ovs_conntrack_info *info,
+			   struct sk_buff *skb)
+{
+	/* If we are recirculating packets to match on conntrack fields and
+	 * committing with a separate conntrack action,  then we don't need to
+	 * actually run the packet through conntrack twice unless it's for a
+	 * different zone.
+	 */
+	bool cached = skb_nfct_cached(net, key, info, skb);
+	enum ip_conntrack_info ctinfo;
+	struct nf_conn *ct;
+
+	if (!cached) {
+		struct nf_conn *tmpl = info->ct;
+		int err;
+
+		/* Associate skb with specified zone. */
+		if (tmpl) {
+			if (skb_nfct(skb))
+				nf_conntrack_put(skb_nfct(skb));
+			nf_conntrack_get(&tmpl->ct_general);
+			nf_ct_set(skb, tmpl, IP_CT_NEW);
+		}
+
+		err = nf_conntrack_in(net, info->family,
+				      NF_INET_PRE_ROUTING, skb);
+		if (err != NF_ACCEPT)
+			return -ENOENT;
+
+		/* Clear CT state NAT flags to mark that we have not yet done
+		 * NAT after the nf_conntrack_in() call.  We can actually clear
+		 * the whole state, as it will be re-initialized below.
+		 */
+		key->ct_state = 0;
+
+		/* Update the key, but keep the NAT flags. */
+		ovs_ct_update_key(skb, info, key, true, true);
+	}
+
+	ct = nf_ct_get(skb, &ctinfo);
+	if (ct) {
+		/* Packets starting a new connection must be NATted before the
+		 * helper, so that the helper knows about the NAT.  We enforce
+		 * this by delaying both NAT and helper calls for unconfirmed
+		 * connections until the committing CT action.  For later
+		 * packets NAT and Helper may be called in either order.
+		 *
+		 * NAT will be done only if the CT action has NAT, and only
+		 * once per packet (per zone), as guarded by the NAT bits in
+		 * the key->ct_state.
+		 */
+		if (info->nat && !(key->ct_state & OVS_CS_F_NAT_MASK) &&
+		    (nf_ct_is_confirmed(ct) || info->commit) &&
+		    ovs_ct_nat(net, key, info, skb, ct, ctinfo) != NF_ACCEPT) {
+			return -EINVAL;
+		}
+
+		/* Userspace may decide to perform a ct lookup without a helper
+		 * specified followed by a (recirculate and) commit with one.
+		 * Therefore, for unconfirmed connections which we will commit,
+		 * we need to attach the helper here.
+		 */
+		if (!nf_ct_is_confirmed(ct) && info->commit &&
+		    info->helper && !nfct_help(ct)) {
+			int err = __nf_ct_try_assign_helper(ct, info->ct,
+							    GFP_ATOMIC);
+			if (err)
+				return err;
+		}
+
+		/* Call the helper only if:
+		 * - nf_conntrack_in() was executed above ("!cached") for a
+		 *   confirmed connection, or
+		 * - When committing an unconfirmed connection.
+		 */
+		if ((nf_ct_is_confirmed(ct) ? !cached : info->commit) &&
+		    ovs_ct_helper(skb, info->family) != NF_ACCEPT) {
+			return -EINVAL;
+		}
+	}
+
+	return 0;
+}
+
+/* Lookup connection and read fields into key. */
+static int ovs_ct_lookup(struct net *net, struct sw_flow_key *key,
+			 const struct ovs_conntrack_info *info,
+			 struct sk_buff *skb)
+{
+	struct nf_conntrack_expect *exp;
+
+	/* If we pass an expected packet through nf_conntrack_in() the
+	 * expectation is typically removed, but the packet could still be
+	 * lost in upcall processing.  To prevent this from happening we
+	 * perform an explicit expectation lookup.  Expected connections are
+	 * always new, and will be passed through conntrack only when they are
+	 * committed, as it is OK to remove the expectation at that time.
+	 */
+	exp = ovs_ct_expect_find(net, &info->zone, info->family, skb);
+	if (exp) {
+		u8 state;
+
+		/* NOTE: New connections are NATted and Helped only when
+		 * committed, so we are not calling into NAT here.
+		 */
+		state = OVS_CS_F_TRACKED | OVS_CS_F_NEW | OVS_CS_F_RELATED;
+		__ovs_ct_update_key(key, state, &info->zone, exp->master);
+	} else {
+		struct nf_conn *ct;
+		int err;
+
+		err = __ovs_ct_lookup(net, key, info, skb);
+		if (err)
+			return err;
+
+		ct = (struct nf_conn *)skb_nfct(skb);
+		if (ct)
+			nf_ct_deliver_cached_events(ct);
+	}
+
+	return 0;
+}
+
+static bool labels_nonzero(const struct ovs_key_ct_labels *labels)
+{
+	size_t i;
+
+	for (i = 0; i < OVS_CT_LABELS_LEN_32; i++)
+		if (labels->ct_labels_32[i])
+			return true;
+
+	return false;
+}
+
+#if	IS_ENABLED(CONFIG_NETFILTER_CONNCOUNT)
+static struct hlist_head *ct_limit_hash_bucket(
+	const struct ovs_ct_limit_info *info, u16 zone)
+{
+	return &info->limits[zone & (CT_LIMIT_HASH_BUCKETS - 1)];
+}
+
+/* Call with ovs_mutex */
+static void ct_limit_set(const struct ovs_ct_limit_info *info,
+			 struct ovs_ct_limit *new_ct_limit)
+{
+	struct ovs_ct_limit *ct_limit;
+	struct hlist_head *head;
+
+	head = ct_limit_hash_bucket(info, new_ct_limit->zone);
+	hlist_for_each_entry_rcu(ct_limit, head, hlist_node) {
+		if (ct_limit->zone == new_ct_limit->zone) {
+			hlist_replace_rcu(&ct_limit->hlist_node,
+					  &new_ct_limit->hlist_node);
+			kfree_rcu(ct_limit, rcu);
+			return;
+		}
+	}
+
+	hlist_add_head_rcu(&new_ct_limit->hlist_node, head);
+}
+
+/* Call with ovs_mutex */
+static void ct_limit_del(const struct ovs_ct_limit_info *info, u16 zone)
+{
+	struct ovs_ct_limit *ct_limit;
+	struct hlist_head *head;
+	struct hlist_node *n;
+
+	head = ct_limit_hash_bucket(info, zone);
+	hlist_for_each_entry_safe(ct_limit, n, head, hlist_node) {
+		if (ct_limit->zone == zone) {
+			hlist_del_rcu(&ct_limit->hlist_node);
+			kfree_rcu(ct_limit, rcu);
+			return;
+		}
+	}
+}
+
+/* Call with RCU read lock */
+static u32 ct_limit_get(const struct ovs_ct_limit_info *info, u16 zone)
+{
+	struct ovs_ct_limit *ct_limit;
+	struct hlist_head *head;
+
+	head = ct_limit_hash_bucket(info, zone);
+	hlist_for_each_entry_rcu(ct_limit, head, hlist_node) {
+		if (ct_limit->zone == zone)
+			return ct_limit->limit;
+	}
+
+	return info->default_limit;
+}
+
+static int ovs_ct_check_limit(struct net *net,
+			      const struct ovs_conntrack_info *info,
+			      const struct nf_conntrack_tuple *tuple)
+{
+	struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
+	const struct ovs_ct_limit_info *ct_limit_info = ovs_net->ct_limit_info;
+	u32 per_zone_limit, connections;
+	u32 conncount_key;
+
+	conncount_key = info->zone.id;
+
+	per_zone_limit = ct_limit_get(ct_limit_info, info->zone.id);
+	if (per_zone_limit == OVS_CT_LIMIT_UNLIMITED)
+		return 0;
+
+	connections = nf_conncount_count(net, ct_limit_info->data,
+					 &conncount_key, tuple, &info->zone);
+	if (connections > per_zone_limit)
+		return -ENOMEM;
+
+	return 0;
+}
+#endif
+
+/* Lookup connection and confirm if unconfirmed. */
+static int ovs_ct_commit(struct net *net, struct sw_flow_key *key,
+			 const struct ovs_conntrack_info *info,
+			 struct sk_buff *skb)
+{
+	enum ip_conntrack_info ctinfo;
+	struct nf_conn *ct;
+	int err;
+
+	err = __ovs_ct_lookup(net, key, info, skb);
+	if (err)
+		return err;
+
+	/* The connection could be invalid, in which case this is a no-op.*/
+	ct = nf_ct_get(skb, &ctinfo);
+	if (!ct)
+		return 0;
+
+#if	IS_ENABLED(CONFIG_NETFILTER_CONNCOUNT)
+	if (static_branch_unlikely(&ovs_ct_limit_enabled)) {
+		if (!nf_ct_is_confirmed(ct)) {
+			err = ovs_ct_check_limit(net, info,
+				&ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple);
+			if (err) {
+				net_warn_ratelimited("openvswitch: zone: %u "
+					"execeeds conntrack limit\n",
+					info->zone.id);
+				return err;
+			}
+		}
+	}
+#endif
+
+	/* Set the conntrack event mask if given.  NEW and DELETE events have
+	 * their own groups, but the NFNLGRP_CONNTRACK_UPDATE group listener
+	 * typically would receive many kinds of updates.  Setting the event
+	 * mask allows those events to be filtered.  The set event mask will
+	 * remain in effect for the lifetime of the connection unless changed
+	 * by a further CT action with both the commit flag and the eventmask
+	 * option. */
+	if (info->have_eventmask) {
+		struct nf_conntrack_ecache *cache = nf_ct_ecache_find(ct);
+
+		if (cache)
+			cache->ctmask = info->eventmask;
+	}
+
+	/* Apply changes before confirming the connection so that the initial
+	 * conntrack NEW netlink event carries the values given in the CT
+	 * action.
+	 */
+	if (info->mark.mask) {
+		err = ovs_ct_set_mark(ct, key, info->mark.value,
+				      info->mark.mask);
+		if (err)
+			return err;
+	}
+	if (!nf_ct_is_confirmed(ct)) {
+		err = ovs_ct_init_labels(ct, key, &info->labels.value,
+					 &info->labels.mask);
+		if (err)
+			return err;
+	} else if (IS_ENABLED(CONFIG_NF_CONNTRACK_LABELS) &&
+		   labels_nonzero(&info->labels.mask)) {
+		err = ovs_ct_set_labels(ct, key, &info->labels.value,
+					&info->labels.mask);
+		if (err)
+			return err;
+	}
+	/* This will take care of sending queued events even if the connection
+	 * is already confirmed.
+	 */
+	if (nf_conntrack_confirm(skb) != NF_ACCEPT)
+		return -EINVAL;
+
+	return 0;
+}
+
+/* Trim the skb to the length specified by the IP/IPv6 header,
+ * removing any trailing lower-layer padding. This prepares the skb
+ * for higher-layer processing that assumes skb->len excludes padding
+ * (such as nf_ip_checksum). The caller needs to pull the skb to the
+ * network header, and ensure ip_hdr/ipv6_hdr points to valid data.
+ */
+static int ovs_skb_network_trim(struct sk_buff *skb)
+{
+	unsigned int len;
+	int err;
+
+	switch (skb->protocol) {
+	case htons(ETH_P_IP):
+		len = ntohs(ip_hdr(skb)->tot_len);
+		break;
+	case htons(ETH_P_IPV6):
+		len = sizeof(struct ipv6hdr)
+			+ ntohs(ipv6_hdr(skb)->payload_len);
+		break;
+	default:
+		len = skb->len;
+	}
+
+	err = pskb_trim_rcsum(skb, len);
+	if (err)
+		kfree_skb(skb);
+
+	return err;
+}
+
+/* Returns 0 on success, -EINPROGRESS if 'skb' is stolen, or other nonzero
+ * value if 'skb' is freed.
+ */
+int ovs_ct_execute(struct net *net, struct sk_buff *skb,
+		   struct sw_flow_key *key,
+		   const struct ovs_conntrack_info *info)
+{
+	int nh_ofs;
+	int err;
+
+	/* The conntrack module expects to be working at L3. */
+	nh_ofs = skb_network_offset(skb);
+	skb_pull_rcsum(skb, nh_ofs);
+
+	err = ovs_skb_network_trim(skb);
+	if (err)
+		return err;
+
+	if (key->ip.frag != OVS_FRAG_TYPE_NONE) {
+		err = handle_fragments(net, key, info->zone.id, skb);
+		if (err)
+			return err;
+	}
+
+	if (info->commit)
+		err = ovs_ct_commit(net, key, info, skb);
+	else
+		err = ovs_ct_lookup(net, key, info, skb);
+
+	skb_push(skb, nh_ofs);
+	skb_postpush_rcsum(skb, skb->data, nh_ofs);
+	if (err)
+		kfree_skb(skb);
+	return err;
+}
+
+int ovs_ct_clear(struct sk_buff *skb, struct sw_flow_key *key)
+{
+	if (skb_nfct(skb)) {
+		nf_conntrack_put(skb_nfct(skb));
+		nf_ct_set(skb, NULL, IP_CT_UNTRACKED);
+		if (key)
+			ovs_ct_fill_key(skb, key);
+	}
+
+	return 0;
+}
+
+static int ovs_ct_add_helper(struct ovs_conntrack_info *info, const char *name,
+			     const struct sw_flow_key *key, bool log)
+{
+	struct nf_conntrack_helper *helper;
+	struct nf_conn_help *help;
+
+	helper = nf_conntrack_helper_try_module_get(name, info->family,
+						    key->ip.proto);
+	if (!helper) {
+		OVS_NLERR(log, "Unknown helper \"%s\"", name);
+		return -EINVAL;
+	}
+
+	help = nf_ct_helper_ext_add(info->ct, GFP_KERNEL);
+	if (!help) {
+		nf_conntrack_helper_put(helper);
+		return -ENOMEM;
+	}
+
+	rcu_assign_pointer(help->helper, helper);
+	info->helper = helper;
+
+	if (info->nat)
+		request_module("ip_nat_%s", name);
+
+	return 0;
+}
+
+#ifdef CONFIG_NF_NAT_NEEDED
+static int parse_nat(const struct nlattr *attr,
+		     struct ovs_conntrack_info *info, bool log)
+{
+	struct nlattr *a;
+	int rem;
+	bool have_ip_max = false;
+	bool have_proto_max = false;
+	bool ip_vers = (info->family == NFPROTO_IPV6);
+
+	nla_for_each_nested(a, attr, rem) {
+		static const int ovs_nat_attr_lens[OVS_NAT_ATTR_MAX + 1][2] = {
+			[OVS_NAT_ATTR_SRC] = {0, 0},
+			[OVS_NAT_ATTR_DST] = {0, 0},
+			[OVS_NAT_ATTR_IP_MIN] = {sizeof(struct in_addr),
+						 sizeof(struct in6_addr)},
+			[OVS_NAT_ATTR_IP_MAX] = {sizeof(struct in_addr),
+						 sizeof(struct in6_addr)},
+			[OVS_NAT_ATTR_PROTO_MIN] = {sizeof(u16), sizeof(u16)},
+			[OVS_NAT_ATTR_PROTO_MAX] = {sizeof(u16), sizeof(u16)},
+			[OVS_NAT_ATTR_PERSISTENT] = {0, 0},
+			[OVS_NAT_ATTR_PROTO_HASH] = {0, 0},
+			[OVS_NAT_ATTR_PROTO_RANDOM] = {0, 0},
+		};
+		int type = nla_type(a);
+
+		if (type > OVS_NAT_ATTR_MAX) {
+			OVS_NLERR(log, "Unknown NAT attribute (type=%d, max=%d)",
+				  type, OVS_NAT_ATTR_MAX);
+			return -EINVAL;
+		}
+
+		if (nla_len(a) != ovs_nat_attr_lens[type][ip_vers]) {
+			OVS_NLERR(log, "NAT attribute type %d has unexpected length (%d != %d)",
+				  type, nla_len(a),
+				  ovs_nat_attr_lens[type][ip_vers]);
+			return -EINVAL;
+		}
+
+		switch (type) {
+		case OVS_NAT_ATTR_SRC:
+		case OVS_NAT_ATTR_DST:
+			if (info->nat) {
+				OVS_NLERR(log, "Only one type of NAT may be specified");
+				return -ERANGE;
+			}
+			info->nat |= OVS_CT_NAT;
+			info->nat |= ((type == OVS_NAT_ATTR_SRC)
+					? OVS_CT_SRC_NAT : OVS_CT_DST_NAT);
+			break;
+
+		case OVS_NAT_ATTR_IP_MIN:
+			nla_memcpy(&info->range.min_addr, a,
+				   sizeof(info->range.min_addr));
+			info->range.flags |= NF_NAT_RANGE_MAP_IPS;
+			break;
+
+		case OVS_NAT_ATTR_IP_MAX:
+			have_ip_max = true;
+			nla_memcpy(&info->range.max_addr, a,
+				   sizeof(info->range.max_addr));
+			info->range.flags |= NF_NAT_RANGE_MAP_IPS;
+			break;
+
+		case OVS_NAT_ATTR_PROTO_MIN:
+			info->range.min_proto.all = htons(nla_get_u16(a));
+			info->range.flags |= NF_NAT_RANGE_PROTO_SPECIFIED;
+			break;
+
+		case OVS_NAT_ATTR_PROTO_MAX:
+			have_proto_max = true;
+			info->range.max_proto.all = htons(nla_get_u16(a));
+			info->range.flags |= NF_NAT_RANGE_PROTO_SPECIFIED;
+			break;
+
+		case OVS_NAT_ATTR_PERSISTENT:
+			info->range.flags |= NF_NAT_RANGE_PERSISTENT;
+			break;
+
+		case OVS_NAT_ATTR_PROTO_HASH:
+			info->range.flags |= NF_NAT_RANGE_PROTO_RANDOM;
+			break;
+
+		case OVS_NAT_ATTR_PROTO_RANDOM:
+			info->range.flags |= NF_NAT_RANGE_PROTO_RANDOM_FULLY;
+			break;
+
+		default:
+			OVS_NLERR(log, "Unknown nat attribute (%d)", type);
+			return -EINVAL;
+		}
+	}
+
+	if (rem > 0) {
+		OVS_NLERR(log, "NAT attribute has %d unknown bytes", rem);
+		return -EINVAL;
+	}
+	if (!info->nat) {
+		/* Do not allow flags if no type is given. */
+		if (info->range.flags) {
+			OVS_NLERR(log,
+				  "NAT flags may be given only when NAT range (SRC or DST) is also specified."
+				  );
+			return -EINVAL;
+		}
+		info->nat = OVS_CT_NAT;   /* NAT existing connections. */
+	} else if (!info->commit) {
+		OVS_NLERR(log,
+			  "NAT attributes may be specified only when CT COMMIT flag is also specified."
+			  );
+		return -EINVAL;
+	}
+	/* Allow missing IP_MAX. */
+	if (info->range.flags & NF_NAT_RANGE_MAP_IPS && !have_ip_max) {
+		memcpy(&info->range.max_addr, &info->range.min_addr,
+		       sizeof(info->range.max_addr));
+	}
+	/* Allow missing PROTO_MAX. */
+	if (info->range.flags & NF_NAT_RANGE_PROTO_SPECIFIED &&
+	    !have_proto_max) {
+		info->range.max_proto.all = info->range.min_proto.all;
+	}
+	return 0;
+}
+#endif
+
+static const struct ovs_ct_len_tbl ovs_ct_attr_lens[OVS_CT_ATTR_MAX + 1] = {
+	[OVS_CT_ATTR_COMMIT]	= { .minlen = 0, .maxlen = 0 },
+	[OVS_CT_ATTR_FORCE_COMMIT]	= { .minlen = 0, .maxlen = 0 },
+	[OVS_CT_ATTR_ZONE]	= { .minlen = sizeof(u16),
+				    .maxlen = sizeof(u16) },
+	[OVS_CT_ATTR_MARK]	= { .minlen = sizeof(struct md_mark),
+				    .maxlen = sizeof(struct md_mark) },
+	[OVS_CT_ATTR_LABELS]	= { .minlen = sizeof(struct md_labels),
+				    .maxlen = sizeof(struct md_labels) },
+	[OVS_CT_ATTR_HELPER]	= { .minlen = 1,
+				    .maxlen = NF_CT_HELPER_NAME_LEN },
+#ifdef CONFIG_NF_NAT_NEEDED
+	/* NAT length is checked when parsing the nested attributes. */
+	[OVS_CT_ATTR_NAT]	= { .minlen = 0, .maxlen = INT_MAX },
+#endif
+	[OVS_CT_ATTR_EVENTMASK]	= { .minlen = sizeof(u32),
+				    .maxlen = sizeof(u32) },
+};
+
+static int parse_ct(const struct nlattr *attr, struct ovs_conntrack_info *info,
+		    const char **helper, bool log)
+{
+	struct nlattr *a;
+	int rem;
+
+	nla_for_each_nested(a, attr, rem) {
+		int type = nla_type(a);
+		int maxlen;
+		int minlen;
+
+		if (type > OVS_CT_ATTR_MAX) {
+			OVS_NLERR(log,
+				  "Unknown conntrack attr (type=%d, max=%d)",
+				  type, OVS_CT_ATTR_MAX);
+			return -EINVAL;
+		}
+
+		maxlen = ovs_ct_attr_lens[type].maxlen;
+		minlen = ovs_ct_attr_lens[type].minlen;
+		if (nla_len(a) < minlen || nla_len(a) > maxlen) {
+			OVS_NLERR(log,
+				  "Conntrack attr type has unexpected length (type=%d, length=%d, expected=%d)",
+				  type, nla_len(a), maxlen);
+			return -EINVAL;
+		}
+
+		switch (type) {
+		case OVS_CT_ATTR_FORCE_COMMIT:
+			info->force = true;
+			/* fall through. */
+		case OVS_CT_ATTR_COMMIT:
+			info->commit = true;
+			break;
+#ifdef CONFIG_NF_CONNTRACK_ZONES
+		case OVS_CT_ATTR_ZONE:
+			info->zone.id = nla_get_u16(a);
+			break;
+#endif
+#ifdef CONFIG_NF_CONNTRACK_MARK
+		case OVS_CT_ATTR_MARK: {
+			struct md_mark *mark = nla_data(a);
+
+			if (!mark->mask) {
+				OVS_NLERR(log, "ct_mark mask cannot be 0");
+				return -EINVAL;
+			}
+			info->mark = *mark;
+			break;
+		}
+#endif
+#ifdef CONFIG_NF_CONNTRACK_LABELS
+		case OVS_CT_ATTR_LABELS: {
+			struct md_labels *labels = nla_data(a);
+
+			if (!labels_nonzero(&labels->mask)) {
+				OVS_NLERR(log, "ct_labels mask cannot be 0");
+				return -EINVAL;
+			}
+			info->labels = *labels;
+			break;
+		}
+#endif
+		case OVS_CT_ATTR_HELPER:
+			*helper = nla_data(a);
+			if (!memchr(*helper, '\0', nla_len(a))) {
+				OVS_NLERR(log, "Invalid conntrack helper");
+				return -EINVAL;
+			}
+			break;
+#ifdef CONFIG_NF_NAT_NEEDED
+		case OVS_CT_ATTR_NAT: {
+			int err = parse_nat(a, info, log);
+
+			if (err)
+				return err;
+			break;
+		}
+#endif
+		case OVS_CT_ATTR_EVENTMASK:
+			info->have_eventmask = true;
+			info->eventmask = nla_get_u32(a);
+			break;
+
+		default:
+			OVS_NLERR(log, "Unknown conntrack attr (%d)",
+				  type);
+			return -EINVAL;
+		}
+	}
+
+#ifdef CONFIG_NF_CONNTRACK_MARK
+	if (!info->commit && info->mark.mask) {
+		OVS_NLERR(log,
+			  "Setting conntrack mark requires 'commit' flag.");
+		return -EINVAL;
+	}
+#endif
+#ifdef CONFIG_NF_CONNTRACK_LABELS
+	if (!info->commit && labels_nonzero(&info->labels.mask)) {
+		OVS_NLERR(log,
+			  "Setting conntrack labels requires 'commit' flag.");
+		return -EINVAL;
+	}
+#endif
+	if (rem > 0) {
+		OVS_NLERR(log, "Conntrack attr has %d unknown bytes", rem);
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+bool ovs_ct_verify(struct net *net, enum ovs_key_attr attr)
+{
+	if (attr == OVS_KEY_ATTR_CT_STATE)
+		return true;
+	if (IS_ENABLED(CONFIG_NF_CONNTRACK_ZONES) &&
+	    attr == OVS_KEY_ATTR_CT_ZONE)
+		return true;
+	if (IS_ENABLED(CONFIG_NF_CONNTRACK_MARK) &&
+	    attr == OVS_KEY_ATTR_CT_MARK)
+		return true;
+	if (IS_ENABLED(CONFIG_NF_CONNTRACK_LABELS) &&
+	    attr == OVS_KEY_ATTR_CT_LABELS) {
+		struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
+
+		return ovs_net->xt_label;
+	}
+
+	return false;
+}
+
+int ovs_ct_copy_action(struct net *net, const struct nlattr *attr,
+		       const struct sw_flow_key *key,
+		       struct sw_flow_actions **sfa,  bool log)
+{
+	struct ovs_conntrack_info ct_info;
+	const char *helper = NULL;
+	u16 family;
+	int err;
+
+	family = key_to_nfproto(key);
+	if (family == NFPROTO_UNSPEC) {
+		OVS_NLERR(log, "ct family unspecified");
+		return -EINVAL;
+	}
+
+	memset(&ct_info, 0, sizeof(ct_info));
+	ct_info.family = family;
+
+	nf_ct_zone_init(&ct_info.zone, NF_CT_DEFAULT_ZONE_ID,
+			NF_CT_DEFAULT_ZONE_DIR, 0);
+
+	err = parse_ct(attr, &ct_info, &helper, log);
+	if (err)
+		return err;
+
+	/* Set up template for tracking connections in specific zones. */
+	ct_info.ct = nf_ct_tmpl_alloc(net, &ct_info.zone, GFP_KERNEL);
+	if (!ct_info.ct) {
+		OVS_NLERR(log, "Failed to allocate conntrack template");
+		return -ENOMEM;
+	}
+	if (helper) {
+		err = ovs_ct_add_helper(&ct_info, helper, key, log);
+		if (err)
+			goto err_free_ct;
+	}
+
+	err = ovs_nla_add_action(sfa, OVS_ACTION_ATTR_CT, &ct_info,
+				 sizeof(ct_info), log);
+	if (err)
+		goto err_free_ct;
+
+	__set_bit(IPS_CONFIRMED_BIT, &ct_info.ct->status);
+	nf_conntrack_get(&ct_info.ct->ct_general);
+	return 0;
+err_free_ct:
+	__ovs_ct_free_action(&ct_info);
+	return err;
+}
+
+#ifdef CONFIG_NF_NAT_NEEDED
+static bool ovs_ct_nat_to_attr(const struct ovs_conntrack_info *info,
+			       struct sk_buff *skb)
+{
+	struct nlattr *start;
+
+	start = nla_nest_start(skb, OVS_CT_ATTR_NAT);
+	if (!start)
+		return false;
+
+	if (info->nat & OVS_CT_SRC_NAT) {
+		if (nla_put_flag(skb, OVS_NAT_ATTR_SRC))
+			return false;
+	} else if (info->nat & OVS_CT_DST_NAT) {
+		if (nla_put_flag(skb, OVS_NAT_ATTR_DST))
+			return false;
+	} else {
+		goto out;
+	}
+
+	if (info->range.flags & NF_NAT_RANGE_MAP_IPS) {
+		if (IS_ENABLED(CONFIG_NF_NAT_IPV4) &&
+		    info->family == NFPROTO_IPV4) {
+			if (nla_put_in_addr(skb, OVS_NAT_ATTR_IP_MIN,
+					    info->range.min_addr.ip) ||
+			    (info->range.max_addr.ip
+			     != info->range.min_addr.ip &&
+			     (nla_put_in_addr(skb, OVS_NAT_ATTR_IP_MAX,
+					      info->range.max_addr.ip))))
+				return false;
+		} else if (IS_ENABLED(CONFIG_NF_NAT_IPV6) &&
+			   info->family == NFPROTO_IPV6) {
+			if (nla_put_in6_addr(skb, OVS_NAT_ATTR_IP_MIN,
+					     &info->range.min_addr.in6) ||
+			    (memcmp(&info->range.max_addr.in6,
+				    &info->range.min_addr.in6,
+				    sizeof(info->range.max_addr.in6)) &&
+			     (nla_put_in6_addr(skb, OVS_NAT_ATTR_IP_MAX,
+					       &info->range.max_addr.in6))))
+				return false;
+		} else {
+			return false;
+		}
+	}
+	if (info->range.flags & NF_NAT_RANGE_PROTO_SPECIFIED &&
+	    (nla_put_u16(skb, OVS_NAT_ATTR_PROTO_MIN,
+			 ntohs(info->range.min_proto.all)) ||
+	     (info->range.max_proto.all != info->range.min_proto.all &&
+	      nla_put_u16(skb, OVS_NAT_ATTR_PROTO_MAX,
+			  ntohs(info->range.max_proto.all)))))
+		return false;
+
+	if (info->range.flags & NF_NAT_RANGE_PERSISTENT &&
+	    nla_put_flag(skb, OVS_NAT_ATTR_PERSISTENT))
+		return false;
+	if (info->range.flags & NF_NAT_RANGE_PROTO_RANDOM &&
+	    nla_put_flag(skb, OVS_NAT_ATTR_PROTO_HASH))
+		return false;
+	if (info->range.flags & NF_NAT_RANGE_PROTO_RANDOM_FULLY &&
+	    nla_put_flag(skb, OVS_NAT_ATTR_PROTO_RANDOM))
+		return false;
+out:
+	nla_nest_end(skb, start);
+
+	return true;
+}
+#endif
+
+int ovs_ct_action_to_attr(const struct ovs_conntrack_info *ct_info,
+			  struct sk_buff *skb)
+{
+	struct nlattr *start;
+
+	start = nla_nest_start(skb, OVS_ACTION_ATTR_CT);
+	if (!start)
+		return -EMSGSIZE;
+
+	if (ct_info->commit && nla_put_flag(skb, ct_info->force
+					    ? OVS_CT_ATTR_FORCE_COMMIT
+					    : OVS_CT_ATTR_COMMIT))
+		return -EMSGSIZE;
+	if (IS_ENABLED(CONFIG_NF_CONNTRACK_ZONES) &&
+	    nla_put_u16(skb, OVS_CT_ATTR_ZONE, ct_info->zone.id))
+		return -EMSGSIZE;
+	if (IS_ENABLED(CONFIG_NF_CONNTRACK_MARK) && ct_info->mark.mask &&
+	    nla_put(skb, OVS_CT_ATTR_MARK, sizeof(ct_info->mark),
+		    &ct_info->mark))
+		return -EMSGSIZE;
+	if (IS_ENABLED(CONFIG_NF_CONNTRACK_LABELS) &&
+	    labels_nonzero(&ct_info->labels.mask) &&
+	    nla_put(skb, OVS_CT_ATTR_LABELS, sizeof(ct_info->labels),
+		    &ct_info->labels))
+		return -EMSGSIZE;
+	if (ct_info->helper) {
+		if (nla_put_string(skb, OVS_CT_ATTR_HELPER,
+				   ct_info->helper->name))
+			return -EMSGSIZE;
+	}
+	if (ct_info->have_eventmask &&
+	    nla_put_u32(skb, OVS_CT_ATTR_EVENTMASK, ct_info->eventmask))
+		return -EMSGSIZE;
+
+#ifdef CONFIG_NF_NAT_NEEDED
+	if (ct_info->nat && !ovs_ct_nat_to_attr(ct_info, skb))
+		return -EMSGSIZE;
+#endif
+	nla_nest_end(skb, start);
+
+	return 0;
+}
+
+void ovs_ct_free_action(const struct nlattr *a)
+{
+	struct ovs_conntrack_info *ct_info = nla_data(a);
+
+	__ovs_ct_free_action(ct_info);
+}
+
+static void __ovs_ct_free_action(struct ovs_conntrack_info *ct_info)
+{
+	if (ct_info->helper)
+		nf_conntrack_helper_put(ct_info->helper);
+	if (ct_info->ct)
+		nf_ct_tmpl_free(ct_info->ct);
+}
+
+#if	IS_ENABLED(CONFIG_NETFILTER_CONNCOUNT)
+static int ovs_ct_limit_init(struct net *net, struct ovs_net *ovs_net)
+{
+	int i, err;
+
+	ovs_net->ct_limit_info = kmalloc(sizeof(*ovs_net->ct_limit_info),
+					 GFP_KERNEL);
+	if (!ovs_net->ct_limit_info)
+		return -ENOMEM;
+
+	ovs_net->ct_limit_info->default_limit = OVS_CT_LIMIT_DEFAULT;
+	ovs_net->ct_limit_info->limits =
+		kmalloc_array(CT_LIMIT_HASH_BUCKETS, sizeof(struct hlist_head),
+			      GFP_KERNEL);
+	if (!ovs_net->ct_limit_info->limits) {
+		kfree(ovs_net->ct_limit_info);
+		return -ENOMEM;
+	}
+
+	for (i = 0; i < CT_LIMIT_HASH_BUCKETS; i++)
+		INIT_HLIST_HEAD(&ovs_net->ct_limit_info->limits[i]);
+
+	ovs_net->ct_limit_info->data =
+		nf_conncount_init(net, NFPROTO_INET, sizeof(u32));
+
+	if (IS_ERR(ovs_net->ct_limit_info->data)) {
+		err = PTR_ERR(ovs_net->ct_limit_info->data);
+		kfree(ovs_net->ct_limit_info->limits);
+		kfree(ovs_net->ct_limit_info);
+		pr_err("openvswitch: failed to init nf_conncount %d\n", err);
+		return err;
+	}
+	return 0;
+}
+
+static void ovs_ct_limit_exit(struct net *net, struct ovs_net *ovs_net)
+{
+	const struct ovs_ct_limit_info *info = ovs_net->ct_limit_info;
+	int i;
+
+	nf_conncount_destroy(net, NFPROTO_INET, info->data);
+	for (i = 0; i < CT_LIMIT_HASH_BUCKETS; ++i) {
+		struct hlist_head *head = &info->limits[i];
+		struct ovs_ct_limit *ct_limit;
+
+		hlist_for_each_entry_rcu(ct_limit, head, hlist_node)
+			kfree_rcu(ct_limit, rcu);
+	}
+	kfree(ovs_net->ct_limit_info->limits);
+	kfree(ovs_net->ct_limit_info);
+}
+
+static struct sk_buff *
+ovs_ct_limit_cmd_reply_start(struct genl_info *info, u8 cmd,
+			     struct ovs_header **ovs_reply_header)
+{
+	struct ovs_header *ovs_header = info->userhdr;
+	struct sk_buff *skb;
+
+	skb = genlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
+	if (!skb)
+		return ERR_PTR(-ENOMEM);
+
+	*ovs_reply_header = genlmsg_put(skb, info->snd_portid,
+					info->snd_seq,
+					&dp_ct_limit_genl_family, 0, cmd);
+
+	if (!*ovs_reply_header) {
+		nlmsg_free(skb);
+		return ERR_PTR(-EMSGSIZE);
+	}
+	(*ovs_reply_header)->dp_ifindex = ovs_header->dp_ifindex;
+
+	return skb;
+}
+
+static bool check_zone_id(int zone_id, u16 *pzone)
+{
+	if (zone_id >= 0 && zone_id <= 65535) {
+		*pzone = (u16)zone_id;
+		return true;
+	}
+	return false;
+}
+
+static int ovs_ct_limit_set_zone_limit(struct nlattr *nla_zone_limit,
+				       struct ovs_ct_limit_info *info)
+{
+	struct ovs_zone_limit *zone_limit;
+	int rem;
+	u16 zone;
+
+	rem = NLA_ALIGN(nla_len(nla_zone_limit));
+	zone_limit = (struct ovs_zone_limit *)nla_data(nla_zone_limit);
+
+	while (rem >= sizeof(*zone_limit)) {
+		if (unlikely(zone_limit->zone_id ==
+				OVS_ZONE_LIMIT_DEFAULT_ZONE)) {
+			ovs_lock();
+			info->default_limit = zone_limit->limit;
+			ovs_unlock();
+		} else if (unlikely(!check_zone_id(
+				zone_limit->zone_id, &zone))) {
+			OVS_NLERR(true, "zone id is out of range");
+		} else {
+			struct ovs_ct_limit *ct_limit;
+
+			ct_limit = kmalloc(sizeof(*ct_limit), GFP_KERNEL);
+			if (!ct_limit)
+				return -ENOMEM;
+
+			ct_limit->zone = zone;
+			ct_limit->limit = zone_limit->limit;
+
+			ovs_lock();
+			ct_limit_set(info, ct_limit);
+			ovs_unlock();
+		}
+		rem -= NLA_ALIGN(sizeof(*zone_limit));
+		zone_limit = (struct ovs_zone_limit *)((u8 *)zone_limit +
+				NLA_ALIGN(sizeof(*zone_limit)));
+	}
+
+	if (rem)
+		OVS_NLERR(true, "set zone limit has %d unknown bytes", rem);
+
+	return 0;
+}
+
+static int ovs_ct_limit_del_zone_limit(struct nlattr *nla_zone_limit,
+				       struct ovs_ct_limit_info *info)
+{
+	struct ovs_zone_limit *zone_limit;
+	int rem;
+	u16 zone;
+
+	rem = NLA_ALIGN(nla_len(nla_zone_limit));
+	zone_limit = (struct ovs_zone_limit *)nla_data(nla_zone_limit);
+
+	while (rem >= sizeof(*zone_limit)) {
+		if (unlikely(zone_limit->zone_id ==
+				OVS_ZONE_LIMIT_DEFAULT_ZONE)) {
+			ovs_lock();
+			info->default_limit = OVS_CT_LIMIT_DEFAULT;
+			ovs_unlock();
+		} else if (unlikely(!check_zone_id(
+				zone_limit->zone_id, &zone))) {
+			OVS_NLERR(true, "zone id is out of range");
+		} else {
+			ovs_lock();
+			ct_limit_del(info, zone);
+			ovs_unlock();
+		}
+		rem -= NLA_ALIGN(sizeof(*zone_limit));
+		zone_limit = (struct ovs_zone_limit *)((u8 *)zone_limit +
+				NLA_ALIGN(sizeof(*zone_limit)));
+	}
+
+	if (rem)
+		OVS_NLERR(true, "del zone limit has %d unknown bytes", rem);
+
+	return 0;
+}
+
+static int ovs_ct_limit_get_default_limit(struct ovs_ct_limit_info *info,
+					  struct sk_buff *reply)
+{
+	struct ovs_zone_limit zone_limit;
+	int err;
+
+	zone_limit.zone_id = OVS_ZONE_LIMIT_DEFAULT_ZONE;
+	zone_limit.limit = info->default_limit;
+	err = nla_put_nohdr(reply, sizeof(zone_limit), &zone_limit);
+	if (err)
+		return err;
+
+	return 0;
+}
+
+static int __ovs_ct_limit_get_zone_limit(struct net *net,
+					 struct nf_conncount_data *data,
+					 u16 zone_id, u32 limit,
+					 struct sk_buff *reply)
+{
+	struct nf_conntrack_zone ct_zone;
+	struct ovs_zone_limit zone_limit;
+	u32 conncount_key = zone_id;
+
+	zone_limit.zone_id = zone_id;
+	zone_limit.limit = limit;
+	nf_ct_zone_init(&ct_zone, zone_id, NF_CT_DEFAULT_ZONE_DIR, 0);
+
+	zone_limit.count = nf_conncount_count(net, data, &conncount_key, NULL,
+					      &ct_zone);
+	return nla_put_nohdr(reply, sizeof(zone_limit), &zone_limit);
+}
+
+static int ovs_ct_limit_get_zone_limit(struct net *net,
+				       struct nlattr *nla_zone_limit,
+				       struct ovs_ct_limit_info *info,
+				       struct sk_buff *reply)
+{
+	struct ovs_zone_limit *zone_limit;
+	int rem, err;
+	u32 limit;
+	u16 zone;
+
+	rem = NLA_ALIGN(nla_len(nla_zone_limit));
+	zone_limit = (struct ovs_zone_limit *)nla_data(nla_zone_limit);
+
+	while (rem >= sizeof(*zone_limit)) {
+		if (unlikely(zone_limit->zone_id ==
+				OVS_ZONE_LIMIT_DEFAULT_ZONE)) {
+			err = ovs_ct_limit_get_default_limit(info, reply);
+			if (err)
+				return err;
+		} else if (unlikely(!check_zone_id(zone_limit->zone_id,
+							&zone))) {
+			OVS_NLERR(true, "zone id is out of range");
+		} else {
+			rcu_read_lock();
+			limit = ct_limit_get(info, zone);
+			rcu_read_unlock();
+
+			err = __ovs_ct_limit_get_zone_limit(
+				net, info->data, zone, limit, reply);
+			if (err)
+				return err;
+		}
+		rem -= NLA_ALIGN(sizeof(*zone_limit));
+		zone_limit = (struct ovs_zone_limit *)((u8 *)zone_limit +
+				NLA_ALIGN(sizeof(*zone_limit)));
+	}
+
+	if (rem)
+		OVS_NLERR(true, "get zone limit has %d unknown bytes", rem);
+
+	return 0;
+}
+
+static int ovs_ct_limit_get_all_zone_limit(struct net *net,
+					   struct ovs_ct_limit_info *info,
+					   struct sk_buff *reply)
+{
+	struct ovs_ct_limit *ct_limit;
+	struct hlist_head *head;
+	int i, err = 0;
+
+	err = ovs_ct_limit_get_default_limit(info, reply);
+	if (err)
+		return err;
+
+	rcu_read_lock();
+	for (i = 0; i < CT_LIMIT_HASH_BUCKETS; ++i) {
+		head = &info->limits[i];
+		hlist_for_each_entry_rcu(ct_limit, head, hlist_node) {
+			err = __ovs_ct_limit_get_zone_limit(net, info->data,
+				ct_limit->zone, ct_limit->limit, reply);
+			if (err)
+				goto exit_err;
+		}
+	}
+
+exit_err:
+	rcu_read_unlock();
+	return err;
+}
+
+static int ovs_ct_limit_cmd_set(struct sk_buff *skb, struct genl_info *info)
+{
+	struct nlattr **a = info->attrs;
+	struct sk_buff *reply;
+	struct ovs_header *ovs_reply_header;
+	struct ovs_net *ovs_net = net_generic(sock_net(skb->sk), ovs_net_id);
+	struct ovs_ct_limit_info *ct_limit_info = ovs_net->ct_limit_info;
+	int err;
+
+	reply = ovs_ct_limit_cmd_reply_start(info, OVS_CT_LIMIT_CMD_SET,
+					     &ovs_reply_header);
+	if (IS_ERR(reply))
+		return PTR_ERR(reply);
+
+	if (!a[OVS_CT_LIMIT_ATTR_ZONE_LIMIT]) {
+		err = -EINVAL;
+		goto exit_err;
+	}
+
+	err = ovs_ct_limit_set_zone_limit(a[OVS_CT_LIMIT_ATTR_ZONE_LIMIT],
+					  ct_limit_info);
+	if (err)
+		goto exit_err;
+
+	static_branch_enable(&ovs_ct_limit_enabled);
+
+	genlmsg_end(reply, ovs_reply_header);
+	return genlmsg_reply(reply, info);
+
+exit_err:
+	nlmsg_free(reply);
+	return err;
+}
+
+static int ovs_ct_limit_cmd_del(struct sk_buff *skb, struct genl_info *info)
+{
+	struct nlattr **a = info->attrs;
+	struct sk_buff *reply;
+	struct ovs_header *ovs_reply_header;
+	struct ovs_net *ovs_net = net_generic(sock_net(skb->sk), ovs_net_id);
+	struct ovs_ct_limit_info *ct_limit_info = ovs_net->ct_limit_info;
+	int err;
+
+	reply = ovs_ct_limit_cmd_reply_start(info, OVS_CT_LIMIT_CMD_DEL,
+					     &ovs_reply_header);
+	if (IS_ERR(reply))
+		return PTR_ERR(reply);
+
+	if (!a[OVS_CT_LIMIT_ATTR_ZONE_LIMIT]) {
+		err = -EINVAL;
+		goto exit_err;
+	}
+
+	err = ovs_ct_limit_del_zone_limit(a[OVS_CT_LIMIT_ATTR_ZONE_LIMIT],
+					  ct_limit_info);
+	if (err)
+		goto exit_err;
+
+	genlmsg_end(reply, ovs_reply_header);
+	return genlmsg_reply(reply, info);
+
+exit_err:
+	nlmsg_free(reply);
+	return err;
+}
+
+static int ovs_ct_limit_cmd_get(struct sk_buff *skb, struct genl_info *info)
+{
+	struct nlattr **a = info->attrs;
+	struct nlattr *nla_reply;
+	struct sk_buff *reply;
+	struct ovs_header *ovs_reply_header;
+	struct net *net = sock_net(skb->sk);
+	struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
+	struct ovs_ct_limit_info *ct_limit_info = ovs_net->ct_limit_info;
+	int err;
+
+	reply = ovs_ct_limit_cmd_reply_start(info, OVS_CT_LIMIT_CMD_GET,
+					     &ovs_reply_header);
+	if (IS_ERR(reply))
+		return PTR_ERR(reply);
+
+	nla_reply = nla_nest_start(reply, OVS_CT_LIMIT_ATTR_ZONE_LIMIT);
+
+	if (a[OVS_CT_LIMIT_ATTR_ZONE_LIMIT]) {
+		err = ovs_ct_limit_get_zone_limit(
+			net, a[OVS_CT_LIMIT_ATTR_ZONE_LIMIT], ct_limit_info,
+			reply);
+		if (err)
+			goto exit_err;
+	} else {
+		err = ovs_ct_limit_get_all_zone_limit(net, ct_limit_info,
+						      reply);
+		if (err)
+			goto exit_err;
+	}
+
+	nla_nest_end(reply, nla_reply);
+	genlmsg_end(reply, ovs_reply_header);
+	return genlmsg_reply(reply, info);
+
+exit_err:
+	nlmsg_free(reply);
+	return err;
+}
+
+static struct genl_ops ct_limit_genl_ops[] = {
+	{ .cmd = OVS_CT_LIMIT_CMD_SET,
+		.flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN
+					   * privilege. */
+		.policy = ct_limit_policy,
+		.doit = ovs_ct_limit_cmd_set,
+	},
+	{ .cmd = OVS_CT_LIMIT_CMD_DEL,
+		.flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN
+					   * privilege. */
+		.policy = ct_limit_policy,
+		.doit = ovs_ct_limit_cmd_del,
+	},
+	{ .cmd = OVS_CT_LIMIT_CMD_GET,
+		.flags = 0,		  /* OK for unprivileged users. */
+		.policy = ct_limit_policy,
+		.doit = ovs_ct_limit_cmd_get,
+	},
+};
+
+static const struct genl_multicast_group ovs_ct_limit_multicast_group = {
+	.name = OVS_CT_LIMIT_MCGROUP,
+};
+
+struct genl_family dp_ct_limit_genl_family __ro_after_init = {
+	.hdrsize = sizeof(struct ovs_header),
+	.name = OVS_CT_LIMIT_FAMILY,
+	.version = OVS_CT_LIMIT_VERSION,
+	.maxattr = OVS_CT_LIMIT_ATTR_MAX,
+	.netnsok = true,
+	.parallel_ops = true,
+	.ops = ct_limit_genl_ops,
+	.n_ops = ARRAY_SIZE(ct_limit_genl_ops),
+	.mcgrps = &ovs_ct_limit_multicast_group,
+	.n_mcgrps = 1,
+	.module = THIS_MODULE,
+};
+#endif
+
+int ovs_ct_init(struct net *net)
+{
+	unsigned int n_bits = sizeof(struct ovs_key_ct_labels) * BITS_PER_BYTE;
+	struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
+
+	if (nf_connlabels_get(net, n_bits - 1)) {
+		ovs_net->xt_label = false;
+		OVS_NLERR(true, "Failed to set connlabel length");
+	} else {
+		ovs_net->xt_label = true;
+	}
+
+#if	IS_ENABLED(CONFIG_NETFILTER_CONNCOUNT)
+	return ovs_ct_limit_init(net, ovs_net);
+#else
+	return 0;
+#endif
+}
+
+void ovs_ct_exit(struct net *net)
+{
+	struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
+
+#if	IS_ENABLED(CONFIG_NETFILTER_CONNCOUNT)
+	ovs_ct_limit_exit(net, ovs_net);
+#endif
+
+	if (ovs_net->xt_label)
+		nf_connlabels_put(net);
+}
diff --git a/net/openvswitch/conntrack.h b/net/openvswitch/conntrack.h
new file mode 100644
index 000000000..900dadd70
--- /dev/null
+++ b/net/openvswitch/conntrack.h
@@ -0,0 +1,112 @@
+/*
+ * Copyright (c) 2015 Nicira, Inc.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of version 2 of the GNU General Public
+ * License as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ */
+
+#ifndef OVS_CONNTRACK_H
+#define OVS_CONNTRACK_H 1
+
+#include "flow.h"
+
+struct ovs_conntrack_info;
+struct ovs_ct_limit_info;
+enum ovs_key_attr;
+
+#if IS_ENABLED(CONFIG_NF_CONNTRACK)
+int ovs_ct_init(struct net *);
+void ovs_ct_exit(struct net *);
+bool ovs_ct_verify(struct net *, enum ovs_key_attr attr);
+int ovs_ct_copy_action(struct net *, const struct nlattr *,
+		       const struct sw_flow_key *, struct sw_flow_actions **,
+		       bool log);
+int ovs_ct_action_to_attr(const struct ovs_conntrack_info *, struct sk_buff *);
+
+int ovs_ct_execute(struct net *, struct sk_buff *, struct sw_flow_key *,
+		   const struct ovs_conntrack_info *);
+int ovs_ct_clear(struct sk_buff *skb, struct sw_flow_key *key);
+
+void ovs_ct_fill_key(const struct sk_buff *skb, struct sw_flow_key *key);
+int ovs_ct_put_key(const struct sw_flow_key *swkey,
+		   const struct sw_flow_key *output, struct sk_buff *skb);
+void ovs_ct_free_action(const struct nlattr *a);
+
+#define CT_SUPPORTED_MASK (OVS_CS_F_NEW | OVS_CS_F_ESTABLISHED | \
+			   OVS_CS_F_RELATED | OVS_CS_F_REPLY_DIR | \
+			   OVS_CS_F_INVALID | OVS_CS_F_TRACKED | \
+			   OVS_CS_F_SRC_NAT | OVS_CS_F_DST_NAT)
+#else
+#include <linux/errno.h>
+
+static inline int ovs_ct_init(struct net *net) { return 0; }
+
+static inline void ovs_ct_exit(struct net *net) { }
+
+static inline bool ovs_ct_verify(struct net *net, int attr)
+{
+	return false;
+}
+
+static inline int ovs_ct_copy_action(struct net *net, const struct nlattr *nla,
+				     const struct sw_flow_key *key,
+				     struct sw_flow_actions **acts, bool log)
+{
+	return -ENOTSUPP;
+}
+
+static inline int ovs_ct_action_to_attr(const struct ovs_conntrack_info *info,
+					struct sk_buff *skb)
+{
+	return -ENOTSUPP;
+}
+
+static inline int ovs_ct_execute(struct net *net, struct sk_buff *skb,
+				 struct sw_flow_key *key,
+				 const struct ovs_conntrack_info *info)
+{
+	kfree_skb(skb);
+	return -ENOTSUPP;
+}
+
+static inline int ovs_ct_clear(struct sk_buff *skb,
+			       struct sw_flow_key *key)
+{
+	return -ENOTSUPP;
+}
+
+static inline void ovs_ct_fill_key(const struct sk_buff *skb,
+				   struct sw_flow_key *key)
+{
+	key->ct_state = 0;
+	key->ct_zone = 0;
+	key->ct.mark = 0;
+	memset(&key->ct.labels, 0, sizeof(key->ct.labels));
+	/* Clear 'ct_orig_proto' to mark the non-existence of original
+	 * direction key fields.
+	 */
+	key->ct_orig_proto = 0;
+}
+
+static inline int ovs_ct_put_key(const struct sw_flow_key *swkey,
+				 const struct sw_flow_key *output,
+				 struct sk_buff *skb)
+{
+	return 0;
+}
+
+static inline void ovs_ct_free_action(const struct nlattr *a) { }
+
+#define CT_SUPPORTED_MASK 0
+#endif /* CONFIG_NF_CONNTRACK */
+
+#if IS_ENABLED(CONFIG_NETFILTER_CONNCOUNT)
+extern struct genl_family dp_ct_limit_genl_family;
+#endif
+#endif /* ovs_conntrack.h */
diff --git a/net/openvswitch/datapath.c b/net/openvswitch/datapath.c
new file mode 100644
index 000000000..f350faef0
--- /dev/null
+++ b/net/openvswitch/datapath.c
@@ -0,0 +1,2488 @@
+/*
+ * Copyright (c) 2007-2014 Nicira, Inc.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of version 2 of the GNU General Public
+ * License as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/if_arp.h>
+#include <linux/if_vlan.h>
+#include <linux/in.h>
+#include <linux/ip.h>
+#include <linux/jhash.h>
+#include <linux/delay.h>
+#include <linux/time.h>
+#include <linux/etherdevice.h>
+#include <linux/genetlink.h>
+#include <linux/kernel.h>
+#include <linux/kthread.h>
+#include <linux/mutex.h>
+#include <linux/percpu.h>
+#include <linux/rcupdate.h>
+#include <linux/tcp.h>
+#include <linux/udp.h>
+#include <linux/ethtool.h>
+#include <linux/wait.h>
+#include <asm/div64.h>
+#include <linux/highmem.h>
+#include <linux/netfilter_bridge.h>
+#include <linux/netfilter_ipv4.h>
+#include <linux/inetdevice.h>
+#include <linux/list.h>
+#include <linux/openvswitch.h>
+#include <linux/rculist.h>
+#include <linux/dmi.h>
+#include <net/genetlink.h>
+#include <net/net_namespace.h>
+#include <net/netns/generic.h>
+
+#include "datapath.h"
+#include "flow.h"
+#include "flow_table.h"
+#include "flow_netlink.h"
+#include "meter.h"
+#include "vport-internal_dev.h"
+#include "vport-netdev.h"
+
+unsigned int ovs_net_id __read_mostly;
+
+static struct genl_family dp_packet_genl_family;
+static struct genl_family dp_flow_genl_family;
+static struct genl_family dp_datapath_genl_family;
+
+static const struct nla_policy flow_policy[];
+
+static const struct genl_multicast_group ovs_dp_flow_multicast_group = {
+	.name = OVS_FLOW_MCGROUP,
+};
+
+static const struct genl_multicast_group ovs_dp_datapath_multicast_group = {
+	.name = OVS_DATAPATH_MCGROUP,
+};
+
+static const struct genl_multicast_group ovs_dp_vport_multicast_group = {
+	.name = OVS_VPORT_MCGROUP,
+};
+
+/* Check if need to build a reply message.
+ * OVS userspace sets the NLM_F_ECHO flag if it needs the reply. */
+static bool ovs_must_notify(struct genl_family *family, struct genl_info *info,
+			    unsigned int group)
+{
+	return info->nlhdr->nlmsg_flags & NLM_F_ECHO ||
+	       genl_has_listeners(family, genl_info_net(info), group);
+}
+
+static void ovs_notify(struct genl_family *family,
+		       struct sk_buff *skb, struct genl_info *info)
+{
+	genl_notify(family, skb, info, 0, GFP_KERNEL);
+}
+
+/**
+ * DOC: Locking:
+ *
+ * All writes e.g. Writes to device state (add/remove datapath, port, set
+ * operations on vports, etc.), Writes to other state (flow table
+ * modifications, set miscellaneous datapath parameters, etc.) are protected
+ * by ovs_lock.
+ *
+ * Reads are protected by RCU.
+ *
+ * There are a few special cases (mostly stats) that have their own
+ * synchronization but they nest under all of above and don't interact with
+ * each other.
+ *
+ * The RTNL lock nests inside ovs_mutex.
+ */
+
+static DEFINE_MUTEX(ovs_mutex);
+
+void ovs_lock(void)
+{
+	mutex_lock(&ovs_mutex);
+}
+
+void ovs_unlock(void)
+{
+	mutex_unlock(&ovs_mutex);
+}
+
+#ifdef CONFIG_LOCKDEP
+int lockdep_ovsl_is_held(void)
+{
+	if (debug_locks)
+		return lockdep_is_held(&ovs_mutex);
+	else
+		return 1;
+}
+#endif
+
+static struct vport *new_vport(const struct vport_parms *);
+static int queue_gso_packets(struct datapath *dp, struct sk_buff *,
+			     const struct sw_flow_key *,
+			     const struct dp_upcall_info *,
+			     uint32_t cutlen);
+static int queue_userspace_packet(struct datapath *dp, struct sk_buff *,
+				  const struct sw_flow_key *,
+				  const struct dp_upcall_info *,
+				  uint32_t cutlen);
+
+/* Must be called with rcu_read_lock or ovs_mutex. */
+const char *ovs_dp_name(const struct datapath *dp)
+{
+	struct vport *vport = ovs_vport_ovsl_rcu(dp, OVSP_LOCAL);
+	return ovs_vport_name(vport);
+}
+
+static int get_dpifindex(const struct datapath *dp)
+{
+	struct vport *local;
+	int ifindex;
+
+	rcu_read_lock();
+
+	local = ovs_vport_rcu(dp, OVSP_LOCAL);
+	if (local)
+		ifindex = local->dev->ifindex;
+	else
+		ifindex = 0;
+
+	rcu_read_unlock();
+
+	return ifindex;
+}
+
+static void destroy_dp_rcu(struct rcu_head *rcu)
+{
+	struct datapath *dp = container_of(rcu, struct datapath, rcu);
+
+	ovs_flow_tbl_destroy(&dp->table);
+	free_percpu(dp->stats_percpu);
+	kfree(dp->ports);
+	ovs_meters_exit(dp);
+	kfree(dp);
+}
+
+static struct hlist_head *vport_hash_bucket(const struct datapath *dp,
+					    u16 port_no)
+{
+	return &dp->ports[port_no & (DP_VPORT_HASH_BUCKETS - 1)];
+}
+
+/* Called with ovs_mutex or RCU read lock. */
+struct vport *ovs_lookup_vport(const struct datapath *dp, u16 port_no)
+{
+	struct vport *vport;
+	struct hlist_head *head;
+
+	head = vport_hash_bucket(dp, port_no);
+	hlist_for_each_entry_rcu(vport, head, dp_hash_node) {
+		if (vport->port_no == port_no)
+			return vport;
+	}
+	return NULL;
+}
+
+/* Called with ovs_mutex. */
+static struct vport *new_vport(const struct vport_parms *parms)
+{
+	struct vport *vport;
+
+	vport = ovs_vport_add(parms);
+	if (!IS_ERR(vport)) {
+		struct datapath *dp = parms->dp;
+		struct hlist_head *head = vport_hash_bucket(dp, vport->port_no);
+
+		hlist_add_head_rcu(&vport->dp_hash_node, head);
+	}
+	return vport;
+}
+
+void ovs_dp_detach_port(struct vport *p)
+{
+	ASSERT_OVSL();
+
+	/* First drop references to device. */
+	hlist_del_rcu(&p->dp_hash_node);
+
+	/* Then destroy it. */
+	ovs_vport_del(p);
+}
+
+/* Must be called with rcu_read_lock. */
+void ovs_dp_process_packet(struct sk_buff *skb, struct sw_flow_key *key)
+{
+	const struct vport *p = OVS_CB(skb)->input_vport;
+	struct datapath *dp = p->dp;
+	struct sw_flow *flow;
+	struct sw_flow_actions *sf_acts;
+	struct dp_stats_percpu *stats;
+	u64 *stats_counter;
+	u32 n_mask_hit;
+
+	stats = this_cpu_ptr(dp->stats_percpu);
+
+	/* Look up flow. */
+	flow = ovs_flow_tbl_lookup_stats(&dp->table, key, &n_mask_hit);
+	if (unlikely(!flow)) {
+		struct dp_upcall_info upcall;
+		int error;
+
+		memset(&upcall, 0, sizeof(upcall));
+		upcall.cmd = OVS_PACKET_CMD_MISS;
+		upcall.portid = ovs_vport_find_upcall_portid(p, skb);
+		upcall.mru = OVS_CB(skb)->mru;
+		error = ovs_dp_upcall(dp, skb, key, &upcall, 0);
+		if (unlikely(error))
+			kfree_skb(skb);
+		else
+			consume_skb(skb);
+		stats_counter = &stats->n_missed;
+		goto out;
+	}
+
+	ovs_flow_stats_update(flow, key->tp.flags, skb);
+	sf_acts = rcu_dereference(flow->sf_acts);
+	ovs_execute_actions(dp, skb, sf_acts, key);
+
+	stats_counter = &stats->n_hit;
+
+out:
+	/* Update datapath statistics. */
+	u64_stats_update_begin(&stats->syncp);
+	(*stats_counter)++;
+	stats->n_mask_hit += n_mask_hit;
+	u64_stats_update_end(&stats->syncp);
+}
+
+int ovs_dp_upcall(struct datapath *dp, struct sk_buff *skb,
+		  const struct sw_flow_key *key,
+		  const struct dp_upcall_info *upcall_info,
+		  uint32_t cutlen)
+{
+	struct dp_stats_percpu *stats;
+	int err;
+
+	if (upcall_info->portid == 0) {
+		err = -ENOTCONN;
+		goto err;
+	}
+
+	if (!skb_is_gso(skb))
+		err = queue_userspace_packet(dp, skb, key, upcall_info, cutlen);
+	else
+		err = queue_gso_packets(dp, skb, key, upcall_info, cutlen);
+	if (err)
+		goto err;
+
+	return 0;
+
+err:
+	stats = this_cpu_ptr(dp->stats_percpu);
+
+	u64_stats_update_begin(&stats->syncp);
+	stats->n_lost++;
+	u64_stats_update_end(&stats->syncp);
+
+	return err;
+}
+
+static int queue_gso_packets(struct datapath *dp, struct sk_buff *skb,
+			     const struct sw_flow_key *key,
+			     const struct dp_upcall_info *upcall_info,
+				 uint32_t cutlen)
+{
+	unsigned int gso_type = skb_shinfo(skb)->gso_type;
+	struct sw_flow_key later_key;
+	struct sk_buff *segs, *nskb;
+	int err;
+
+	BUILD_BUG_ON(sizeof(*OVS_CB(skb)) > SKB_SGO_CB_OFFSET);
+	segs = __skb_gso_segment(skb, NETIF_F_SG, false);
+	if (IS_ERR(segs))
+		return PTR_ERR(segs);
+	if (segs == NULL)
+		return -EINVAL;
+
+	if (gso_type & SKB_GSO_UDP) {
+		/* The initial flow key extracted by ovs_flow_key_extract()
+		 * in this case is for a first fragment, so we need to
+		 * properly mark later fragments.
+		 */
+		later_key = *key;
+		later_key.ip.frag = OVS_FRAG_TYPE_LATER;
+	}
+
+	/* Queue all of the segments. */
+	skb = segs;
+	do {
+		if (gso_type & SKB_GSO_UDP && skb != segs)
+			key = &later_key;
+
+		err = queue_userspace_packet(dp, skb, key, upcall_info, cutlen);
+		if (err)
+			break;
+
+	} while ((skb = skb->next));
+
+	/* Free all of the segments. */
+	skb = segs;
+	do {
+		nskb = skb->next;
+		if (err)
+			kfree_skb(skb);
+		else
+			consume_skb(skb);
+	} while ((skb = nskb));
+	return err;
+}
+
+static size_t upcall_msg_size(const struct dp_upcall_info *upcall_info,
+			      unsigned int hdrlen, int actions_attrlen)
+{
+	size_t size = NLMSG_ALIGN(sizeof(struct ovs_header))
+		+ nla_total_size(hdrlen) /* OVS_PACKET_ATTR_PACKET */
+		+ nla_total_size(ovs_key_attr_size()) /* OVS_PACKET_ATTR_KEY */
+		+ nla_total_size(sizeof(unsigned int)); /* OVS_PACKET_ATTR_LEN */
+
+	/* OVS_PACKET_ATTR_USERDATA */
+	if (upcall_info->userdata)
+		size += NLA_ALIGN(upcall_info->userdata->nla_len);
+
+	/* OVS_PACKET_ATTR_EGRESS_TUN_KEY */
+	if (upcall_info->egress_tun_info)
+		size += nla_total_size(ovs_tun_key_attr_size());
+
+	/* OVS_PACKET_ATTR_ACTIONS */
+	if (upcall_info->actions_len)
+		size += nla_total_size(actions_attrlen);
+
+	/* OVS_PACKET_ATTR_MRU */
+	if (upcall_info->mru)
+		size += nla_total_size(sizeof(upcall_info->mru));
+
+	return size;
+}
+
+static void pad_packet(struct datapath *dp, struct sk_buff *skb)
+{
+	if (!(dp->user_features & OVS_DP_F_UNALIGNED)) {
+		size_t plen = NLA_ALIGN(skb->len) - skb->len;
+
+		if (plen > 0)
+			skb_put_zero(skb, plen);
+	}
+}
+
+static int queue_userspace_packet(struct datapath *dp, struct sk_buff *skb,
+				  const struct sw_flow_key *key,
+				  const struct dp_upcall_info *upcall_info,
+				  uint32_t cutlen)
+{
+	struct ovs_header *upcall;
+	struct sk_buff *nskb = NULL;
+	struct sk_buff *user_skb = NULL; /* to be queued to userspace */
+	struct nlattr *nla;
+	size_t len;
+	unsigned int hlen;
+	int err, dp_ifindex;
+
+	dp_ifindex = get_dpifindex(dp);
+	if (!dp_ifindex)
+		return -ENODEV;
+
+	if (skb_vlan_tag_present(skb)) {
+		nskb = skb_clone(skb, GFP_ATOMIC);
+		if (!nskb)
+			return -ENOMEM;
+
+		nskb = __vlan_hwaccel_push_inside(nskb);
+		if (!nskb)
+			return -ENOMEM;
+
+		skb = nskb;
+	}
+
+	if (nla_attr_size(skb->len) > USHRT_MAX) {
+		err = -EFBIG;
+		goto out;
+	}
+
+	/* Complete checksum if needed */
+	if (skb->ip_summed == CHECKSUM_PARTIAL &&
+	    (err = skb_csum_hwoffload_help(skb, 0)))
+		goto out;
+
+	/* Older versions of OVS user space enforce alignment of the last
+	 * Netlink attribute to NLA_ALIGNTO which would require extensive
+	 * padding logic. Only perform zerocopy if padding is not required.
+	 */
+	if (dp->user_features & OVS_DP_F_UNALIGNED)
+		hlen = skb_zerocopy_headlen(skb);
+	else
+		hlen = skb->len;
+
+	len = upcall_msg_size(upcall_info, hlen - cutlen,
+			      OVS_CB(skb)->acts_origlen);
+	user_skb = genlmsg_new(len, GFP_ATOMIC);
+	if (!user_skb) {
+		err = -ENOMEM;
+		goto out;
+	}
+
+	upcall = genlmsg_put(user_skb, 0, 0, &dp_packet_genl_family,
+			     0, upcall_info->cmd);
+	upcall->dp_ifindex = dp_ifindex;
+
+	err = ovs_nla_put_key(key, key, OVS_PACKET_ATTR_KEY, false, user_skb);
+	BUG_ON(err);
+
+	if (upcall_info->userdata)
+		__nla_put(user_skb, OVS_PACKET_ATTR_USERDATA,
+			  nla_len(upcall_info->userdata),
+			  nla_data(upcall_info->userdata));
+
+	if (upcall_info->egress_tun_info) {
+		nla = nla_nest_start(user_skb, OVS_PACKET_ATTR_EGRESS_TUN_KEY);
+		err = ovs_nla_put_tunnel_info(user_skb,
+					      upcall_info->egress_tun_info);
+		BUG_ON(err);
+		nla_nest_end(user_skb, nla);
+	}
+
+	if (upcall_info->actions_len) {
+		nla = nla_nest_start(user_skb, OVS_PACKET_ATTR_ACTIONS);
+		err = ovs_nla_put_actions(upcall_info->actions,
+					  upcall_info->actions_len,
+					  user_skb);
+		if (!err)
+			nla_nest_end(user_skb, nla);
+		else
+			nla_nest_cancel(user_skb, nla);
+	}
+
+	/* Add OVS_PACKET_ATTR_MRU */
+	if (upcall_info->mru) {
+		if (nla_put_u16(user_skb, OVS_PACKET_ATTR_MRU,
+				upcall_info->mru)) {
+			err = -ENOBUFS;
+			goto out;
+		}
+		pad_packet(dp, user_skb);
+	}
+
+	/* Add OVS_PACKET_ATTR_LEN when packet is truncated */
+	if (cutlen > 0) {
+		if (nla_put_u32(user_skb, OVS_PACKET_ATTR_LEN,
+				skb->len)) {
+			err = -ENOBUFS;
+			goto out;
+		}
+		pad_packet(dp, user_skb);
+	}
+
+	/* Only reserve room for attribute header, packet data is added
+	 * in skb_zerocopy() */
+	if (!(nla = nla_reserve(user_skb, OVS_PACKET_ATTR_PACKET, 0))) {
+		err = -ENOBUFS;
+		goto out;
+	}
+	nla->nla_len = nla_attr_size(skb->len - cutlen);
+
+	err = skb_zerocopy(user_skb, skb, skb->len - cutlen, hlen);
+	if (err)
+		goto out;
+
+	/* Pad OVS_PACKET_ATTR_PACKET if linear copy was performed */
+	pad_packet(dp, user_skb);
+
+	((struct nlmsghdr *) user_skb->data)->nlmsg_len = user_skb->len;
+
+	err = genlmsg_unicast(ovs_dp_get_net(dp), user_skb, upcall_info->portid);
+	user_skb = NULL;
+out:
+	if (err)
+		skb_tx_error(skb);
+	kfree_skb(user_skb);
+	kfree_skb(nskb);
+	return err;
+}
+
+static int ovs_packet_cmd_execute(struct sk_buff *skb, struct genl_info *info)
+{
+	struct ovs_header *ovs_header = info->userhdr;
+	struct net *net = sock_net(skb->sk);
+	struct nlattr **a = info->attrs;
+	struct sw_flow_actions *acts;
+	struct sk_buff *packet;
+	struct sw_flow *flow;
+	struct sw_flow_actions *sf_acts;
+	struct datapath *dp;
+	struct vport *input_vport;
+	u16 mru = 0;
+	int len;
+	int err;
+	bool log = !a[OVS_PACKET_ATTR_PROBE];
+
+	err = -EINVAL;
+	if (!a[OVS_PACKET_ATTR_PACKET] || !a[OVS_PACKET_ATTR_KEY] ||
+	    !a[OVS_PACKET_ATTR_ACTIONS])
+		goto err;
+
+	len = nla_len(a[OVS_PACKET_ATTR_PACKET]);
+	packet = __dev_alloc_skb(NET_IP_ALIGN + len, GFP_KERNEL);
+	err = -ENOMEM;
+	if (!packet)
+		goto err;
+	skb_reserve(packet, NET_IP_ALIGN);
+
+	nla_memcpy(__skb_put(packet, len), a[OVS_PACKET_ATTR_PACKET], len);
+
+	/* Set packet's mru */
+	if (a[OVS_PACKET_ATTR_MRU]) {
+		mru = nla_get_u16(a[OVS_PACKET_ATTR_MRU]);
+		packet->ignore_df = 1;
+	}
+	OVS_CB(packet)->mru = mru;
+
+	/* Build an sw_flow for sending this packet. */
+	flow = ovs_flow_alloc();
+	err = PTR_ERR(flow);
+	if (IS_ERR(flow))
+		goto err_kfree_skb;
+
+	err = ovs_flow_key_extract_userspace(net, a[OVS_PACKET_ATTR_KEY],
+					     packet, &flow->key, log);
+	if (err)
+		goto err_flow_free;
+
+	err = ovs_nla_copy_actions(net, a[OVS_PACKET_ATTR_ACTIONS],
+				   &flow->key, &acts, log);
+	if (err)
+		goto err_flow_free;
+
+	rcu_assign_pointer(flow->sf_acts, acts);
+	packet->priority = flow->key.phy.priority;
+	packet->mark = flow->key.phy.skb_mark;
+
+	rcu_read_lock();
+	dp = get_dp_rcu(net, ovs_header->dp_ifindex);
+	err = -ENODEV;
+	if (!dp)
+		goto err_unlock;
+
+	input_vport = ovs_vport_rcu(dp, flow->key.phy.in_port);
+	if (!input_vport)
+		input_vport = ovs_vport_rcu(dp, OVSP_LOCAL);
+
+	if (!input_vport)
+		goto err_unlock;
+
+	packet->dev = input_vport->dev;
+	OVS_CB(packet)->input_vport = input_vport;
+	sf_acts = rcu_dereference(flow->sf_acts);
+
+	local_bh_disable();
+	err = ovs_execute_actions(dp, packet, sf_acts, &flow->key);
+	local_bh_enable();
+	rcu_read_unlock();
+
+	ovs_flow_free(flow, false);
+	return err;
+
+err_unlock:
+	rcu_read_unlock();
+err_flow_free:
+	ovs_flow_free(flow, false);
+err_kfree_skb:
+	kfree_skb(packet);
+err:
+	return err;
+}
+
+static const struct nla_policy packet_policy[OVS_PACKET_ATTR_MAX + 1] = {
+	[OVS_PACKET_ATTR_PACKET] = { .len = ETH_HLEN },
+	[OVS_PACKET_ATTR_KEY] = { .type = NLA_NESTED },
+	[OVS_PACKET_ATTR_ACTIONS] = { .type = NLA_NESTED },
+	[OVS_PACKET_ATTR_PROBE] = { .type = NLA_FLAG },
+	[OVS_PACKET_ATTR_MRU] = { .type = NLA_U16 },
+};
+
+static const struct genl_ops dp_packet_genl_ops[] = {
+	{ .cmd = OVS_PACKET_CMD_EXECUTE,
+	  .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
+	  .policy = packet_policy,
+	  .doit = ovs_packet_cmd_execute
+	}
+};
+
+static struct genl_family dp_packet_genl_family __ro_after_init = {
+	.hdrsize = sizeof(struct ovs_header),
+	.name = OVS_PACKET_FAMILY,
+	.version = OVS_PACKET_VERSION,
+	.maxattr = OVS_PACKET_ATTR_MAX,
+	.netnsok = true,
+	.parallel_ops = true,
+	.ops = dp_packet_genl_ops,
+	.n_ops = ARRAY_SIZE(dp_packet_genl_ops),
+	.module = THIS_MODULE,
+};
+
+static void get_dp_stats(const struct datapath *dp, struct ovs_dp_stats *stats,
+			 struct ovs_dp_megaflow_stats *mega_stats)
+{
+	int i;
+
+	memset(mega_stats, 0, sizeof(*mega_stats));
+
+	stats->n_flows = ovs_flow_tbl_count(&dp->table);
+	mega_stats->n_masks = ovs_flow_tbl_num_masks(&dp->table);
+
+	stats->n_hit = stats->n_missed = stats->n_lost = 0;
+
+	for_each_possible_cpu(i) {
+		const struct dp_stats_percpu *percpu_stats;
+		struct dp_stats_percpu local_stats;
+		unsigned int start;
+
+		percpu_stats = per_cpu_ptr(dp->stats_percpu, i);
+
+		do {
+			start = u64_stats_fetch_begin_irq(&percpu_stats->syncp);
+			local_stats = *percpu_stats;
+		} while (u64_stats_fetch_retry_irq(&percpu_stats->syncp, start));
+
+		stats->n_hit += local_stats.n_hit;
+		stats->n_missed += local_stats.n_missed;
+		stats->n_lost += local_stats.n_lost;
+		mega_stats->n_mask_hit += local_stats.n_mask_hit;
+	}
+}
+
+static bool should_fill_key(const struct sw_flow_id *sfid, uint32_t ufid_flags)
+{
+	return ovs_identifier_is_ufid(sfid) &&
+	       !(ufid_flags & OVS_UFID_F_OMIT_KEY);
+}
+
+static bool should_fill_mask(uint32_t ufid_flags)
+{
+	return !(ufid_flags & OVS_UFID_F_OMIT_MASK);
+}
+
+static bool should_fill_actions(uint32_t ufid_flags)
+{
+	return !(ufid_flags & OVS_UFID_F_OMIT_ACTIONS);
+}
+
+static size_t ovs_flow_cmd_msg_size(const struct sw_flow_actions *acts,
+				    const struct sw_flow_id *sfid,
+				    uint32_t ufid_flags)
+{
+	size_t len = NLMSG_ALIGN(sizeof(struct ovs_header));
+
+	/* OVS_FLOW_ATTR_UFID, or unmasked flow key as fallback
+	 * see ovs_nla_put_identifier()
+	 */
+	if (sfid && ovs_identifier_is_ufid(sfid))
+		len += nla_total_size(sfid->ufid_len);
+	else
+		len += nla_total_size(ovs_key_attr_size());
+
+	/* OVS_FLOW_ATTR_KEY */
+	if (!sfid || should_fill_key(sfid, ufid_flags))
+		len += nla_total_size(ovs_key_attr_size());
+
+	/* OVS_FLOW_ATTR_MASK */
+	if (should_fill_mask(ufid_flags))
+		len += nla_total_size(ovs_key_attr_size());
+
+	/* OVS_FLOW_ATTR_ACTIONS */
+	if (should_fill_actions(ufid_flags))
+		len += nla_total_size(acts->orig_len);
+
+	return len
+		+ nla_total_size_64bit(sizeof(struct ovs_flow_stats)) /* OVS_FLOW_ATTR_STATS */
+		+ nla_total_size(1) /* OVS_FLOW_ATTR_TCP_FLAGS */
+		+ nla_total_size_64bit(8); /* OVS_FLOW_ATTR_USED */
+}
+
+/* Called with ovs_mutex or RCU read lock. */
+static int ovs_flow_cmd_fill_stats(const struct sw_flow *flow,
+				   struct sk_buff *skb)
+{
+	struct ovs_flow_stats stats;
+	__be16 tcp_flags;
+	unsigned long used;
+
+	ovs_flow_stats_get(flow, &stats, &used, &tcp_flags);
+
+	if (used &&
+	    nla_put_u64_64bit(skb, OVS_FLOW_ATTR_USED, ovs_flow_used_time(used),
+			      OVS_FLOW_ATTR_PAD))
+		return -EMSGSIZE;
+
+	if (stats.n_packets &&
+	    nla_put_64bit(skb, OVS_FLOW_ATTR_STATS,
+			  sizeof(struct ovs_flow_stats), &stats,
+			  OVS_FLOW_ATTR_PAD))
+		return -EMSGSIZE;
+
+	if ((u8)ntohs(tcp_flags) &&
+	     nla_put_u8(skb, OVS_FLOW_ATTR_TCP_FLAGS, (u8)ntohs(tcp_flags)))
+		return -EMSGSIZE;
+
+	return 0;
+}
+
+/* Called with ovs_mutex or RCU read lock. */
+static int ovs_flow_cmd_fill_actions(const struct sw_flow *flow,
+				     struct sk_buff *skb, int skb_orig_len)
+{
+	struct nlattr *start;
+	int err;
+
+	/* If OVS_FLOW_ATTR_ACTIONS doesn't fit, skip dumping the actions if
+	 * this is the first flow to be dumped into 'skb'.  This is unusual for
+	 * Netlink but individual action lists can be longer than
+	 * NLMSG_GOODSIZE and thus entirely undumpable if we didn't do this.
+	 * The userspace caller can always fetch the actions separately if it
+	 * really wants them.  (Most userspace callers in fact don't care.)
+	 *
+	 * This can only fail for dump operations because the skb is always
+	 * properly sized for single flows.
+	 */
+	start = nla_nest_start(skb, OVS_FLOW_ATTR_ACTIONS);
+	if (start) {
+		const struct sw_flow_actions *sf_acts;
+
+		sf_acts = rcu_dereference_ovsl(flow->sf_acts);
+		err = ovs_nla_put_actions(sf_acts->actions,
+					  sf_acts->actions_len, skb);
+
+		if (!err)
+			nla_nest_end(skb, start);
+		else {
+			if (skb_orig_len)
+				return err;
+
+			nla_nest_cancel(skb, start);
+		}
+	} else if (skb_orig_len) {
+		return -EMSGSIZE;
+	}
+
+	return 0;
+}
+
+/* Called with ovs_mutex or RCU read lock. */
+static int ovs_flow_cmd_fill_info(const struct sw_flow *flow, int dp_ifindex,
+				  struct sk_buff *skb, u32 portid,
+				  u32 seq, u32 flags, u8 cmd, u32 ufid_flags)
+{
+	const int skb_orig_len = skb->len;
+	struct ovs_header *ovs_header;
+	int err;
+
+	ovs_header = genlmsg_put(skb, portid, seq, &dp_flow_genl_family,
+				 flags, cmd);
+	if (!ovs_header)
+		return -EMSGSIZE;
+
+	ovs_header->dp_ifindex = dp_ifindex;
+
+	err = ovs_nla_put_identifier(flow, skb);
+	if (err)
+		goto error;
+
+	if (should_fill_key(&flow->id, ufid_flags)) {
+		err = ovs_nla_put_masked_key(flow, skb);
+		if (err)
+			goto error;
+	}
+
+	if (should_fill_mask(ufid_flags)) {
+		err = ovs_nla_put_mask(flow, skb);
+		if (err)
+			goto error;
+	}
+
+	err = ovs_flow_cmd_fill_stats(flow, skb);
+	if (err)
+		goto error;
+
+	if (should_fill_actions(ufid_flags)) {
+		err = ovs_flow_cmd_fill_actions(flow, skb, skb_orig_len);
+		if (err)
+			goto error;
+	}
+
+	genlmsg_end(skb, ovs_header);
+	return 0;
+
+error:
+	genlmsg_cancel(skb, ovs_header);
+	return err;
+}
+
+/* May not be called with RCU read lock. */
+static struct sk_buff *ovs_flow_cmd_alloc_info(const struct sw_flow_actions *acts,
+					       const struct sw_flow_id *sfid,
+					       struct genl_info *info,
+					       bool always,
+					       uint32_t ufid_flags)
+{
+	struct sk_buff *skb;
+	size_t len;
+
+	if (!always && !ovs_must_notify(&dp_flow_genl_family, info, 0))
+		return NULL;
+
+	len = ovs_flow_cmd_msg_size(acts, sfid, ufid_flags);
+	skb = genlmsg_new(len, GFP_KERNEL);
+	if (!skb)
+		return ERR_PTR(-ENOMEM);
+
+	return skb;
+}
+
+/* Called with ovs_mutex. */
+static struct sk_buff *ovs_flow_cmd_build_info(const struct sw_flow *flow,
+					       int dp_ifindex,
+					       struct genl_info *info, u8 cmd,
+					       bool always, u32 ufid_flags)
+{
+	struct sk_buff *skb;
+	int retval;
+
+	skb = ovs_flow_cmd_alloc_info(ovsl_dereference(flow->sf_acts),
+				      &flow->id, info, always, ufid_flags);
+	if (IS_ERR_OR_NULL(skb))
+		return skb;
+
+	retval = ovs_flow_cmd_fill_info(flow, dp_ifindex, skb,
+					info->snd_portid, info->snd_seq, 0,
+					cmd, ufid_flags);
+	if (WARN_ON_ONCE(retval < 0)) {
+		kfree_skb(skb);
+		skb = ERR_PTR(retval);
+	}
+	return skb;
+}
+
+static int ovs_flow_cmd_new(struct sk_buff *skb, struct genl_info *info)
+{
+	struct net *net = sock_net(skb->sk);
+	struct nlattr **a = info->attrs;
+	struct ovs_header *ovs_header = info->userhdr;
+	struct sw_flow *flow = NULL, *new_flow;
+	struct sw_flow_mask mask;
+	struct sk_buff *reply;
+	struct datapath *dp;
+	struct sw_flow_actions *acts;
+	struct sw_flow_match match;
+	u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
+	int error;
+	bool log = !a[OVS_FLOW_ATTR_PROBE];
+
+	/* Must have key and actions. */
+	error = -EINVAL;
+	if (!a[OVS_FLOW_ATTR_KEY]) {
+		OVS_NLERR(log, "Flow key attr not present in new flow.");
+		goto error;
+	}
+	if (!a[OVS_FLOW_ATTR_ACTIONS]) {
+		OVS_NLERR(log, "Flow actions attr not present in new flow.");
+		goto error;
+	}
+
+	/* Most of the time we need to allocate a new flow, do it before
+	 * locking.
+	 */
+	new_flow = ovs_flow_alloc();
+	if (IS_ERR(new_flow)) {
+		error = PTR_ERR(new_flow);
+		goto error;
+	}
+
+	/* Extract key. */
+	ovs_match_init(&match, &new_flow->key, false, &mask);
+	error = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY],
+				  a[OVS_FLOW_ATTR_MASK], log);
+	if (error)
+		goto err_kfree_flow;
+
+	/* Extract flow identifier. */
+	error = ovs_nla_get_identifier(&new_flow->id, a[OVS_FLOW_ATTR_UFID],
+				       &new_flow->key, log);
+	if (error)
+		goto err_kfree_flow;
+
+	/* unmasked key is needed to match when ufid is not used. */
+	if (ovs_identifier_is_key(&new_flow->id))
+		match.key = new_flow->id.unmasked_key;
+
+	ovs_flow_mask_key(&new_flow->key, &new_flow->key, true, &mask);
+
+	/* Validate actions. */
+	error = ovs_nla_copy_actions(net, a[OVS_FLOW_ATTR_ACTIONS],
+				     &new_flow->key, &acts, log);
+	if (error) {
+		OVS_NLERR(log, "Flow actions may not be safe on all matching packets.");
+		goto err_kfree_flow;
+	}
+
+	reply = ovs_flow_cmd_alloc_info(acts, &new_flow->id, info, false,
+					ufid_flags);
+	if (IS_ERR(reply)) {
+		error = PTR_ERR(reply);
+		goto err_kfree_acts;
+	}
+
+	ovs_lock();
+	dp = get_dp(net, ovs_header->dp_ifindex);
+	if (unlikely(!dp)) {
+		error = -ENODEV;
+		goto err_unlock_ovs;
+	}
+
+	/* Check if this is a duplicate flow */
+	if (ovs_identifier_is_ufid(&new_flow->id))
+		flow = ovs_flow_tbl_lookup_ufid(&dp->table, &new_flow->id);
+	if (!flow)
+		flow = ovs_flow_tbl_lookup(&dp->table, &new_flow->key);
+	if (likely(!flow)) {
+		rcu_assign_pointer(new_flow->sf_acts, acts);
+
+		/* Put flow in bucket. */
+		error = ovs_flow_tbl_insert(&dp->table, new_flow, &mask);
+		if (unlikely(error)) {
+			acts = NULL;
+			goto err_unlock_ovs;
+		}
+
+		if (unlikely(reply)) {
+			error = ovs_flow_cmd_fill_info(new_flow,
+						       ovs_header->dp_ifindex,
+						       reply, info->snd_portid,
+						       info->snd_seq, 0,
+						       OVS_FLOW_CMD_NEW,
+						       ufid_flags);
+			BUG_ON(error < 0);
+		}
+		ovs_unlock();
+	} else {
+		struct sw_flow_actions *old_acts;
+
+		/* Bail out if we're not allowed to modify an existing flow.
+		 * We accept NLM_F_CREATE in place of the intended NLM_F_EXCL
+		 * because Generic Netlink treats the latter as a dump
+		 * request.  We also accept NLM_F_EXCL in case that bug ever
+		 * gets fixed.
+		 */
+		if (unlikely(info->nlhdr->nlmsg_flags & (NLM_F_CREATE
+							 | NLM_F_EXCL))) {
+			error = -EEXIST;
+			goto err_unlock_ovs;
+		}
+		/* The flow identifier has to be the same for flow updates.
+		 * Look for any overlapping flow.
+		 */
+		if (unlikely(!ovs_flow_cmp(flow, &match))) {
+			if (ovs_identifier_is_key(&flow->id))
+				flow = ovs_flow_tbl_lookup_exact(&dp->table,
+								 &match);
+			else /* UFID matches but key is different */
+				flow = NULL;
+			if (!flow) {
+				error = -ENOENT;
+				goto err_unlock_ovs;
+			}
+		}
+		/* Update actions. */
+		old_acts = ovsl_dereference(flow->sf_acts);
+		rcu_assign_pointer(flow->sf_acts, acts);
+
+		if (unlikely(reply)) {
+			error = ovs_flow_cmd_fill_info(flow,
+						       ovs_header->dp_ifindex,
+						       reply, info->snd_portid,
+						       info->snd_seq, 0,
+						       OVS_FLOW_CMD_NEW,
+						       ufid_flags);
+			BUG_ON(error < 0);
+		}
+		ovs_unlock();
+
+		ovs_nla_free_flow_actions_rcu(old_acts);
+		ovs_flow_free(new_flow, false);
+	}
+
+	if (reply)
+		ovs_notify(&dp_flow_genl_family, reply, info);
+	return 0;
+
+err_unlock_ovs:
+	ovs_unlock();
+	kfree_skb(reply);
+err_kfree_acts:
+	ovs_nla_free_flow_actions(acts);
+err_kfree_flow:
+	ovs_flow_free(new_flow, false);
+error:
+	return error;
+}
+
+/* Factor out action copy to avoid "Wframe-larger-than=1024" warning. */
+static struct sw_flow_actions *get_flow_actions(struct net *net,
+						const struct nlattr *a,
+						const struct sw_flow_key *key,
+						const struct sw_flow_mask *mask,
+						bool log)
+{
+	struct sw_flow_actions *acts;
+	struct sw_flow_key masked_key;
+	int error;
+
+	ovs_flow_mask_key(&masked_key, key, true, mask);
+	error = ovs_nla_copy_actions(net, a, &masked_key, &acts, log);
+	if (error) {
+		OVS_NLERR(log,
+			  "Actions may not be safe on all matching packets");
+		return ERR_PTR(error);
+	}
+
+	return acts;
+}
+
+/* Factor out match-init and action-copy to avoid
+ * "Wframe-larger-than=1024" warning. Because mask is only
+ * used to get actions, we new a function to save some
+ * stack space.
+ *
+ * If there are not key and action attrs, we return 0
+ * directly. In the case, the caller will also not use the
+ * match as before. If there is action attr, we try to get
+ * actions and save them to *acts. Before returning from
+ * the function, we reset the match->mask pointer. Because
+ * we should not to return match object with dangling reference
+ * to mask.
+ * */
+static int ovs_nla_init_match_and_action(struct net *net,
+					 struct sw_flow_match *match,
+					 struct sw_flow_key *key,
+					 struct nlattr **a,
+					 struct sw_flow_actions **acts,
+					 bool log)
+{
+	struct sw_flow_mask mask;
+	int error = 0;
+
+	if (a[OVS_FLOW_ATTR_KEY]) {
+		ovs_match_init(match, key, true, &mask);
+		error = ovs_nla_get_match(net, match, a[OVS_FLOW_ATTR_KEY],
+					  a[OVS_FLOW_ATTR_MASK], log);
+		if (error)
+			goto error;
+	}
+
+	if (a[OVS_FLOW_ATTR_ACTIONS]) {
+		if (!a[OVS_FLOW_ATTR_KEY]) {
+			OVS_NLERR(log,
+				  "Flow key attribute not present in set flow.");
+			error = -EINVAL;
+			goto error;
+		}
+
+		*acts = get_flow_actions(net, a[OVS_FLOW_ATTR_ACTIONS], key,
+					 &mask, log);
+		if (IS_ERR(*acts)) {
+			error = PTR_ERR(*acts);
+			goto error;
+		}
+	}
+
+	/* On success, error is 0. */
+error:
+	match->mask = NULL;
+	return error;
+}
+
+static int ovs_flow_cmd_set(struct sk_buff *skb, struct genl_info *info)
+{
+	struct net *net = sock_net(skb->sk);
+	struct nlattr **a = info->attrs;
+	struct ovs_header *ovs_header = info->userhdr;
+	struct sw_flow_key key;
+	struct sw_flow *flow;
+	struct sk_buff *reply = NULL;
+	struct datapath *dp;
+	struct sw_flow_actions *old_acts = NULL, *acts = NULL;
+	struct sw_flow_match match;
+	struct sw_flow_id sfid;
+	u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
+	int error = 0;
+	bool log = !a[OVS_FLOW_ATTR_PROBE];
+	bool ufid_present;
+
+	ufid_present = ovs_nla_get_ufid(&sfid, a[OVS_FLOW_ATTR_UFID], log);
+	if (!a[OVS_FLOW_ATTR_KEY] && !ufid_present) {
+		OVS_NLERR(log,
+			  "Flow set message rejected, Key attribute missing.");
+		return -EINVAL;
+	}
+
+	error = ovs_nla_init_match_and_action(net, &match, &key, a,
+					      &acts, log);
+	if (error)
+		goto error;
+
+	if (acts) {
+		/* Can allocate before locking if have acts. */
+		reply = ovs_flow_cmd_alloc_info(acts, &sfid, info, false,
+						ufid_flags);
+		if (IS_ERR(reply)) {
+			error = PTR_ERR(reply);
+			goto err_kfree_acts;
+		}
+	}
+
+	ovs_lock();
+	dp = get_dp(net, ovs_header->dp_ifindex);
+	if (unlikely(!dp)) {
+		error = -ENODEV;
+		goto err_unlock_ovs;
+	}
+	/* Check that the flow exists. */
+	if (ufid_present)
+		flow = ovs_flow_tbl_lookup_ufid(&dp->table, &sfid);
+	else
+		flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
+	if (unlikely(!flow)) {
+		error = -ENOENT;
+		goto err_unlock_ovs;
+	}
+
+	/* Update actions, if present. */
+	if (likely(acts)) {
+		old_acts = ovsl_dereference(flow->sf_acts);
+		rcu_assign_pointer(flow->sf_acts, acts);
+
+		if (unlikely(reply)) {
+			error = ovs_flow_cmd_fill_info(flow,
+						       ovs_header->dp_ifindex,
+						       reply, info->snd_portid,
+						       info->snd_seq, 0,
+						       OVS_FLOW_CMD_NEW,
+						       ufid_flags);
+			BUG_ON(error < 0);
+		}
+	} else {
+		/* Could not alloc without acts before locking. */
+		reply = ovs_flow_cmd_build_info(flow, ovs_header->dp_ifindex,
+						info, OVS_FLOW_CMD_NEW, false,
+						ufid_flags);
+
+		if (IS_ERR(reply)) {
+			error = PTR_ERR(reply);
+			goto err_unlock_ovs;
+		}
+	}
+
+	/* Clear stats. */
+	if (a[OVS_FLOW_ATTR_CLEAR])
+		ovs_flow_stats_clear(flow);
+	ovs_unlock();
+
+	if (reply)
+		ovs_notify(&dp_flow_genl_family, reply, info);
+	if (old_acts)
+		ovs_nla_free_flow_actions_rcu(old_acts);
+
+	return 0;
+
+err_unlock_ovs:
+	ovs_unlock();
+	kfree_skb(reply);
+err_kfree_acts:
+	ovs_nla_free_flow_actions(acts);
+error:
+	return error;
+}
+
+static int ovs_flow_cmd_get(struct sk_buff *skb, struct genl_info *info)
+{
+	struct nlattr **a = info->attrs;
+	struct ovs_header *ovs_header = info->userhdr;
+	struct net *net = sock_net(skb->sk);
+	struct sw_flow_key key;
+	struct sk_buff *reply;
+	struct sw_flow *flow;
+	struct datapath *dp;
+	struct sw_flow_match match;
+	struct sw_flow_id ufid;
+	u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
+	int err = 0;
+	bool log = !a[OVS_FLOW_ATTR_PROBE];
+	bool ufid_present;
+
+	ufid_present = ovs_nla_get_ufid(&ufid, a[OVS_FLOW_ATTR_UFID], log);
+	if (a[OVS_FLOW_ATTR_KEY]) {
+		ovs_match_init(&match, &key, true, NULL);
+		err = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY], NULL,
+					log);
+	} else if (!ufid_present) {
+		OVS_NLERR(log,
+			  "Flow get message rejected, Key attribute missing.");
+		err = -EINVAL;
+	}
+	if (err)
+		return err;
+
+	ovs_lock();
+	dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
+	if (!dp) {
+		err = -ENODEV;
+		goto unlock;
+	}
+
+	if (ufid_present)
+		flow = ovs_flow_tbl_lookup_ufid(&dp->table, &ufid);
+	else
+		flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
+	if (!flow) {
+		err = -ENOENT;
+		goto unlock;
+	}
+
+	reply = ovs_flow_cmd_build_info(flow, ovs_header->dp_ifindex, info,
+					OVS_FLOW_CMD_NEW, true, ufid_flags);
+	if (IS_ERR(reply)) {
+		err = PTR_ERR(reply);
+		goto unlock;
+	}
+
+	ovs_unlock();
+	return genlmsg_reply(reply, info);
+unlock:
+	ovs_unlock();
+	return err;
+}
+
+static int ovs_flow_cmd_del(struct sk_buff *skb, struct genl_info *info)
+{
+	struct nlattr **a = info->attrs;
+	struct ovs_header *ovs_header = info->userhdr;
+	struct net *net = sock_net(skb->sk);
+	struct sw_flow_key key;
+	struct sk_buff *reply;
+	struct sw_flow *flow = NULL;
+	struct datapath *dp;
+	struct sw_flow_match match;
+	struct sw_flow_id ufid;
+	u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
+	int err;
+	bool log = !a[OVS_FLOW_ATTR_PROBE];
+	bool ufid_present;
+
+	ufid_present = ovs_nla_get_ufid(&ufid, a[OVS_FLOW_ATTR_UFID], log);
+	if (a[OVS_FLOW_ATTR_KEY]) {
+		ovs_match_init(&match, &key, true, NULL);
+		err = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY],
+					NULL, log);
+		if (unlikely(err))
+			return err;
+	}
+
+	ovs_lock();
+	dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
+	if (unlikely(!dp)) {
+		err = -ENODEV;
+		goto unlock;
+	}
+
+	if (unlikely(!a[OVS_FLOW_ATTR_KEY] && !ufid_present)) {
+		err = ovs_flow_tbl_flush(&dp->table);
+		goto unlock;
+	}
+
+	if (ufid_present)
+		flow = ovs_flow_tbl_lookup_ufid(&dp->table, &ufid);
+	else
+		flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
+	if (unlikely(!flow)) {
+		err = -ENOENT;
+		goto unlock;
+	}
+
+	ovs_flow_tbl_remove(&dp->table, flow);
+	ovs_unlock();
+
+	reply = ovs_flow_cmd_alloc_info((const struct sw_flow_actions __force *) flow->sf_acts,
+					&flow->id, info, false, ufid_flags);
+	if (likely(reply)) {
+		if (likely(!IS_ERR(reply))) {
+			rcu_read_lock();	/*To keep RCU checker happy. */
+			err = ovs_flow_cmd_fill_info(flow, ovs_header->dp_ifindex,
+						     reply, info->snd_portid,
+						     info->snd_seq, 0,
+						     OVS_FLOW_CMD_DEL,
+						     ufid_flags);
+			rcu_read_unlock();
+			if (WARN_ON_ONCE(err < 0)) {
+				kfree_skb(reply);
+				goto out_free;
+			}
+
+			ovs_notify(&dp_flow_genl_family, reply, info);
+		} else {
+			netlink_set_err(sock_net(skb->sk)->genl_sock, 0, 0, PTR_ERR(reply));
+		}
+	}
+
+out_free:
+	ovs_flow_free(flow, true);
+	return 0;
+unlock:
+	ovs_unlock();
+	return err;
+}
+
+static int ovs_flow_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
+{
+	struct nlattr *a[__OVS_FLOW_ATTR_MAX];
+	struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
+	struct table_instance *ti;
+	struct datapath *dp;
+	u32 ufid_flags;
+	int err;
+
+	err = genlmsg_parse(cb->nlh, &dp_flow_genl_family, a,
+			    OVS_FLOW_ATTR_MAX, flow_policy, NULL);
+	if (err)
+		return err;
+	ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
+
+	rcu_read_lock();
+	dp = get_dp_rcu(sock_net(skb->sk), ovs_header->dp_ifindex);
+	if (!dp) {
+		rcu_read_unlock();
+		return -ENODEV;
+	}
+
+	ti = rcu_dereference(dp->table.ti);
+	for (;;) {
+		struct sw_flow *flow;
+		u32 bucket, obj;
+
+		bucket = cb->args[0];
+		obj = cb->args[1];
+		flow = ovs_flow_tbl_dump_next(ti, &bucket, &obj);
+		if (!flow)
+			break;
+
+		if (ovs_flow_cmd_fill_info(flow, ovs_header->dp_ifindex, skb,
+					   NETLINK_CB(cb->skb).portid,
+					   cb->nlh->nlmsg_seq, NLM_F_MULTI,
+					   OVS_FLOW_CMD_NEW, ufid_flags) < 0)
+			break;
+
+		cb->args[0] = bucket;
+		cb->args[1] = obj;
+	}
+	rcu_read_unlock();
+	return skb->len;
+}
+
+static const struct nla_policy flow_policy[OVS_FLOW_ATTR_MAX + 1] = {
+	[OVS_FLOW_ATTR_KEY] = { .type = NLA_NESTED },
+	[OVS_FLOW_ATTR_MASK] = { .type = NLA_NESTED },
+	[OVS_FLOW_ATTR_ACTIONS] = { .type = NLA_NESTED },
+	[OVS_FLOW_ATTR_CLEAR] = { .type = NLA_FLAG },
+	[OVS_FLOW_ATTR_PROBE] = { .type = NLA_FLAG },
+	[OVS_FLOW_ATTR_UFID] = { .type = NLA_UNSPEC, .len = 1 },
+	[OVS_FLOW_ATTR_UFID_FLAGS] = { .type = NLA_U32 },
+};
+
+static const struct genl_ops dp_flow_genl_ops[] = {
+	{ .cmd = OVS_FLOW_CMD_NEW,
+	  .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
+	  .policy = flow_policy,
+	  .doit = ovs_flow_cmd_new
+	},
+	{ .cmd = OVS_FLOW_CMD_DEL,
+	  .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
+	  .policy = flow_policy,
+	  .doit = ovs_flow_cmd_del
+	},
+	{ .cmd = OVS_FLOW_CMD_GET,
+	  .flags = 0,		    /* OK for unprivileged users. */
+	  .policy = flow_policy,
+	  .doit = ovs_flow_cmd_get,
+	  .dumpit = ovs_flow_cmd_dump
+	},
+	{ .cmd = OVS_FLOW_CMD_SET,
+	  .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
+	  .policy = flow_policy,
+	  .doit = ovs_flow_cmd_set,
+	},
+};
+
+static struct genl_family dp_flow_genl_family __ro_after_init = {
+	.hdrsize = sizeof(struct ovs_header),
+	.name = OVS_FLOW_FAMILY,
+	.version = OVS_FLOW_VERSION,
+	.maxattr = OVS_FLOW_ATTR_MAX,
+	.netnsok = true,
+	.parallel_ops = true,
+	.ops = dp_flow_genl_ops,
+	.n_ops = ARRAY_SIZE(dp_flow_genl_ops),
+	.mcgrps = &ovs_dp_flow_multicast_group,
+	.n_mcgrps = 1,
+	.module = THIS_MODULE,
+};
+
+static size_t ovs_dp_cmd_msg_size(void)
+{
+	size_t msgsize = NLMSG_ALIGN(sizeof(struct ovs_header));
+
+	msgsize += nla_total_size(IFNAMSIZ);
+	msgsize += nla_total_size_64bit(sizeof(struct ovs_dp_stats));
+	msgsize += nla_total_size_64bit(sizeof(struct ovs_dp_megaflow_stats));
+	msgsize += nla_total_size(sizeof(u32)); /* OVS_DP_ATTR_USER_FEATURES */
+
+	return msgsize;
+}
+
+/* Called with ovs_mutex. */
+static int ovs_dp_cmd_fill_info(struct datapath *dp, struct sk_buff *skb,
+				u32 portid, u32 seq, u32 flags, u8 cmd)
+{
+	struct ovs_header *ovs_header;
+	struct ovs_dp_stats dp_stats;
+	struct ovs_dp_megaflow_stats dp_megaflow_stats;
+	int err;
+
+	ovs_header = genlmsg_put(skb, portid, seq, &dp_datapath_genl_family,
+				   flags, cmd);
+	if (!ovs_header)
+		goto error;
+
+	ovs_header->dp_ifindex = get_dpifindex(dp);
+
+	err = nla_put_string(skb, OVS_DP_ATTR_NAME, ovs_dp_name(dp));
+	if (err)
+		goto nla_put_failure;
+
+	get_dp_stats(dp, &dp_stats, &dp_megaflow_stats);
+	if (nla_put_64bit(skb, OVS_DP_ATTR_STATS, sizeof(struct ovs_dp_stats),
+			  &dp_stats, OVS_DP_ATTR_PAD))
+		goto nla_put_failure;
+
+	if (nla_put_64bit(skb, OVS_DP_ATTR_MEGAFLOW_STATS,
+			  sizeof(struct ovs_dp_megaflow_stats),
+			  &dp_megaflow_stats, OVS_DP_ATTR_PAD))
+		goto nla_put_failure;
+
+	if (nla_put_u32(skb, OVS_DP_ATTR_USER_FEATURES, dp->user_features))
+		goto nla_put_failure;
+
+	genlmsg_end(skb, ovs_header);
+	return 0;
+
+nla_put_failure:
+	genlmsg_cancel(skb, ovs_header);
+error:
+	return -EMSGSIZE;
+}
+
+static struct sk_buff *ovs_dp_cmd_alloc_info(void)
+{
+	return genlmsg_new(ovs_dp_cmd_msg_size(), GFP_KERNEL);
+}
+
+/* Called with rcu_read_lock or ovs_mutex. */
+static struct datapath *lookup_datapath(struct net *net,
+					const struct ovs_header *ovs_header,
+					struct nlattr *a[OVS_DP_ATTR_MAX + 1])
+{
+	struct datapath *dp;
+
+	if (!a[OVS_DP_ATTR_NAME])
+		dp = get_dp(net, ovs_header->dp_ifindex);
+	else {
+		struct vport *vport;
+
+		vport = ovs_vport_locate(net, nla_data(a[OVS_DP_ATTR_NAME]));
+		dp = vport && vport->port_no == OVSP_LOCAL ? vport->dp : NULL;
+	}
+	return dp ? dp : ERR_PTR(-ENODEV);
+}
+
+static void ovs_dp_reset_user_features(struct sk_buff *skb, struct genl_info *info)
+{
+	struct datapath *dp;
+
+	dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
+	if (IS_ERR(dp))
+		return;
+
+	WARN(dp->user_features, "Dropping previously announced user features\n");
+	dp->user_features = 0;
+}
+
+static void ovs_dp_change(struct datapath *dp, struct nlattr *a[])
+{
+	if (a[OVS_DP_ATTR_USER_FEATURES])
+		dp->user_features = nla_get_u32(a[OVS_DP_ATTR_USER_FEATURES]);
+}
+
+static int ovs_dp_cmd_new(struct sk_buff *skb, struct genl_info *info)
+{
+	struct nlattr **a = info->attrs;
+	struct vport_parms parms;
+	struct sk_buff *reply;
+	struct datapath *dp;
+	struct vport *vport;
+	struct ovs_net *ovs_net;
+	int err, i;
+
+	err = -EINVAL;
+	if (!a[OVS_DP_ATTR_NAME] || !a[OVS_DP_ATTR_UPCALL_PID])
+		goto err;
+
+	reply = ovs_dp_cmd_alloc_info();
+	if (!reply)
+		return -ENOMEM;
+
+	err = -ENOMEM;
+	dp = kzalloc(sizeof(*dp), GFP_KERNEL);
+	if (dp == NULL)
+		goto err_free_reply;
+
+	ovs_dp_set_net(dp, sock_net(skb->sk));
+
+	/* Allocate table. */
+	err = ovs_flow_tbl_init(&dp->table);
+	if (err)
+		goto err_free_dp;
+
+	dp->stats_percpu = netdev_alloc_pcpu_stats(struct dp_stats_percpu);
+	if (!dp->stats_percpu) {
+		err = -ENOMEM;
+		goto err_destroy_table;
+	}
+
+	dp->ports = kmalloc_array(DP_VPORT_HASH_BUCKETS,
+				  sizeof(struct hlist_head),
+				  GFP_KERNEL);
+	if (!dp->ports) {
+		err = -ENOMEM;
+		goto err_destroy_percpu;
+	}
+
+	for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++)
+		INIT_HLIST_HEAD(&dp->ports[i]);
+
+	err = ovs_meters_init(dp);
+	if (err)
+		goto err_destroy_ports_array;
+
+	/* Set up our datapath device. */
+	parms.name = nla_data(a[OVS_DP_ATTR_NAME]);
+	parms.type = OVS_VPORT_TYPE_INTERNAL;
+	parms.options = NULL;
+	parms.dp = dp;
+	parms.port_no = OVSP_LOCAL;
+	parms.upcall_portids = a[OVS_DP_ATTR_UPCALL_PID];
+
+	ovs_dp_change(dp, a);
+
+	/* So far only local changes have been made, now need the lock. */
+	ovs_lock();
+
+	vport = new_vport(&parms);
+	if (IS_ERR(vport)) {
+		err = PTR_ERR(vport);
+		if (err == -EBUSY)
+			err = -EEXIST;
+
+		if (err == -EEXIST) {
+			/* An outdated user space instance that does not understand
+			 * the concept of user_features has attempted to create a new
+			 * datapath and is likely to reuse it. Drop all user features.
+			 */
+			if (info->genlhdr->version < OVS_DP_VER_FEATURES)
+				ovs_dp_reset_user_features(skb, info);
+		}
+
+		goto err_destroy_meters;
+	}
+
+	err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
+				   info->snd_seq, 0, OVS_DP_CMD_NEW);
+	BUG_ON(err < 0);
+
+	ovs_net = net_generic(ovs_dp_get_net(dp), ovs_net_id);
+	list_add_tail_rcu(&dp->list_node, &ovs_net->dps);
+
+	ovs_unlock();
+
+	ovs_notify(&dp_datapath_genl_family, reply, info);
+	return 0;
+
+err_destroy_meters:
+	ovs_unlock();
+	ovs_meters_exit(dp);
+err_destroy_ports_array:
+	kfree(dp->ports);
+err_destroy_percpu:
+	free_percpu(dp->stats_percpu);
+err_destroy_table:
+	ovs_flow_tbl_destroy(&dp->table);
+err_free_dp:
+	kfree(dp);
+err_free_reply:
+	kfree_skb(reply);
+err:
+	return err;
+}
+
+/* Called with ovs_mutex. */
+static void __dp_destroy(struct datapath *dp)
+{
+	int i;
+
+	for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
+		struct vport *vport;
+		struct hlist_node *n;
+
+		hlist_for_each_entry_safe(vport, n, &dp->ports[i], dp_hash_node)
+			if (vport->port_no != OVSP_LOCAL)
+				ovs_dp_detach_port(vport);
+	}
+
+	list_del_rcu(&dp->list_node);
+
+	/* OVSP_LOCAL is datapath internal port. We need to make sure that
+	 * all ports in datapath are destroyed first before freeing datapath.
+	 */
+	ovs_dp_detach_port(ovs_vport_ovsl(dp, OVSP_LOCAL));
+
+	/* RCU destroy the flow table */
+	call_rcu(&dp->rcu, destroy_dp_rcu);
+}
+
+static int ovs_dp_cmd_del(struct sk_buff *skb, struct genl_info *info)
+{
+	struct sk_buff *reply;
+	struct datapath *dp;
+	int err;
+
+	reply = ovs_dp_cmd_alloc_info();
+	if (!reply)
+		return -ENOMEM;
+
+	ovs_lock();
+	dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
+	err = PTR_ERR(dp);
+	if (IS_ERR(dp))
+		goto err_unlock_free;
+
+	err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
+				   info->snd_seq, 0, OVS_DP_CMD_DEL);
+	BUG_ON(err < 0);
+
+	__dp_destroy(dp);
+	ovs_unlock();
+
+	ovs_notify(&dp_datapath_genl_family, reply, info);
+
+	return 0;
+
+err_unlock_free:
+	ovs_unlock();
+	kfree_skb(reply);
+	return err;
+}
+
+static int ovs_dp_cmd_set(struct sk_buff *skb, struct genl_info *info)
+{
+	struct sk_buff *reply;
+	struct datapath *dp;
+	int err;
+
+	reply = ovs_dp_cmd_alloc_info();
+	if (!reply)
+		return -ENOMEM;
+
+	ovs_lock();
+	dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
+	err = PTR_ERR(dp);
+	if (IS_ERR(dp))
+		goto err_unlock_free;
+
+	ovs_dp_change(dp, info->attrs);
+
+	err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
+				   info->snd_seq, 0, OVS_DP_CMD_NEW);
+	BUG_ON(err < 0);
+
+	ovs_unlock();
+	ovs_notify(&dp_datapath_genl_family, reply, info);
+
+	return 0;
+
+err_unlock_free:
+	ovs_unlock();
+	kfree_skb(reply);
+	return err;
+}
+
+static int ovs_dp_cmd_get(struct sk_buff *skb, struct genl_info *info)
+{
+	struct sk_buff *reply;
+	struct datapath *dp;
+	int err;
+
+	reply = ovs_dp_cmd_alloc_info();
+	if (!reply)
+		return -ENOMEM;
+
+	ovs_lock();
+	dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
+	if (IS_ERR(dp)) {
+		err = PTR_ERR(dp);
+		goto err_unlock_free;
+	}
+	err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
+				   info->snd_seq, 0, OVS_DP_CMD_NEW);
+	BUG_ON(err < 0);
+	ovs_unlock();
+
+	return genlmsg_reply(reply, info);
+
+err_unlock_free:
+	ovs_unlock();
+	kfree_skb(reply);
+	return err;
+}
+
+static int ovs_dp_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
+{
+	struct ovs_net *ovs_net = net_generic(sock_net(skb->sk), ovs_net_id);
+	struct datapath *dp;
+	int skip = cb->args[0];
+	int i = 0;
+
+	ovs_lock();
+	list_for_each_entry(dp, &ovs_net->dps, list_node) {
+		if (i >= skip &&
+		    ovs_dp_cmd_fill_info(dp, skb, NETLINK_CB(cb->skb).portid,
+					 cb->nlh->nlmsg_seq, NLM_F_MULTI,
+					 OVS_DP_CMD_NEW) < 0)
+			break;
+		i++;
+	}
+	ovs_unlock();
+
+	cb->args[0] = i;
+
+	return skb->len;
+}
+
+static const struct nla_policy datapath_policy[OVS_DP_ATTR_MAX + 1] = {
+	[OVS_DP_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
+	[OVS_DP_ATTR_UPCALL_PID] = { .type = NLA_U32 },
+	[OVS_DP_ATTR_USER_FEATURES] = { .type = NLA_U32 },
+};
+
+static const struct genl_ops dp_datapath_genl_ops[] = {
+	{ .cmd = OVS_DP_CMD_NEW,
+	  .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
+	  .policy = datapath_policy,
+	  .doit = ovs_dp_cmd_new
+	},
+	{ .cmd = OVS_DP_CMD_DEL,
+	  .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
+	  .policy = datapath_policy,
+	  .doit = ovs_dp_cmd_del
+	},
+	{ .cmd = OVS_DP_CMD_GET,
+	  .flags = 0,		    /* OK for unprivileged users. */
+	  .policy = datapath_policy,
+	  .doit = ovs_dp_cmd_get,
+	  .dumpit = ovs_dp_cmd_dump
+	},
+	{ .cmd = OVS_DP_CMD_SET,
+	  .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
+	  .policy = datapath_policy,
+	  .doit = ovs_dp_cmd_set,
+	},
+};
+
+static struct genl_family dp_datapath_genl_family __ro_after_init = {
+	.hdrsize = sizeof(struct ovs_header),
+	.name = OVS_DATAPATH_FAMILY,
+	.version = OVS_DATAPATH_VERSION,
+	.maxattr = OVS_DP_ATTR_MAX,
+	.netnsok = true,
+	.parallel_ops = true,
+	.ops = dp_datapath_genl_ops,
+	.n_ops = ARRAY_SIZE(dp_datapath_genl_ops),
+	.mcgrps = &ovs_dp_datapath_multicast_group,
+	.n_mcgrps = 1,
+	.module = THIS_MODULE,
+};
+
+/* Called with ovs_mutex or RCU read lock. */
+static int ovs_vport_cmd_fill_info(struct vport *vport, struct sk_buff *skb,
+				   struct net *net, u32 portid, u32 seq,
+				   u32 flags, u8 cmd, gfp_t gfp)
+{
+	struct ovs_header *ovs_header;
+	struct ovs_vport_stats vport_stats;
+	int err;
+
+	ovs_header = genlmsg_put(skb, portid, seq, &dp_vport_genl_family,
+				 flags, cmd);
+	if (!ovs_header)
+		return -EMSGSIZE;
+
+	ovs_header->dp_ifindex = get_dpifindex(vport->dp);
+
+	if (nla_put_u32(skb, OVS_VPORT_ATTR_PORT_NO, vport->port_no) ||
+	    nla_put_u32(skb, OVS_VPORT_ATTR_TYPE, vport->ops->type) ||
+	    nla_put_string(skb, OVS_VPORT_ATTR_NAME,
+			   ovs_vport_name(vport)) ||
+	    nla_put_u32(skb, OVS_VPORT_ATTR_IFINDEX, vport->dev->ifindex))
+		goto nla_put_failure;
+
+	if (!net_eq(net, dev_net(vport->dev))) {
+		int id = peernet2id_alloc(net, dev_net(vport->dev), gfp);
+
+		if (nla_put_s32(skb, OVS_VPORT_ATTR_NETNSID, id))
+			goto nla_put_failure;
+	}
+
+	ovs_vport_get_stats(vport, &vport_stats);
+	if (nla_put_64bit(skb, OVS_VPORT_ATTR_STATS,
+			  sizeof(struct ovs_vport_stats), &vport_stats,
+			  OVS_VPORT_ATTR_PAD))
+		goto nla_put_failure;
+
+	if (ovs_vport_get_upcall_portids(vport, skb))
+		goto nla_put_failure;
+
+	err = ovs_vport_get_options(vport, skb);
+	if (err == -EMSGSIZE)
+		goto error;
+
+	genlmsg_end(skb, ovs_header);
+	return 0;
+
+nla_put_failure:
+	err = -EMSGSIZE;
+error:
+	genlmsg_cancel(skb, ovs_header);
+	return err;
+}
+
+static struct sk_buff *ovs_vport_cmd_alloc_info(void)
+{
+	return nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
+}
+
+/* Called with ovs_mutex, only via ovs_dp_notify_wq(). */
+struct sk_buff *ovs_vport_cmd_build_info(struct vport *vport, struct net *net,
+					 u32 portid, u32 seq, u8 cmd)
+{
+	struct sk_buff *skb;
+	int retval;
+
+	skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
+	if (!skb)
+		return ERR_PTR(-ENOMEM);
+
+	retval = ovs_vport_cmd_fill_info(vport, skb, net, portid, seq, 0, cmd,
+					 GFP_KERNEL);
+	BUG_ON(retval < 0);
+
+	return skb;
+}
+
+/* Called with ovs_mutex or RCU read lock. */
+static struct vport *lookup_vport(struct net *net,
+				  const struct ovs_header *ovs_header,
+				  struct nlattr *a[OVS_VPORT_ATTR_MAX + 1])
+{
+	struct datapath *dp;
+	struct vport *vport;
+
+	if (a[OVS_VPORT_ATTR_IFINDEX])
+		return ERR_PTR(-EOPNOTSUPP);
+	if (a[OVS_VPORT_ATTR_NAME]) {
+		vport = ovs_vport_locate(net, nla_data(a[OVS_VPORT_ATTR_NAME]));
+		if (!vport)
+			return ERR_PTR(-ENODEV);
+		if (ovs_header->dp_ifindex &&
+		    ovs_header->dp_ifindex != get_dpifindex(vport->dp))
+			return ERR_PTR(-ENODEV);
+		return vport;
+	} else if (a[OVS_VPORT_ATTR_PORT_NO]) {
+		u32 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]);
+
+		if (port_no >= DP_MAX_PORTS)
+			return ERR_PTR(-EFBIG);
+
+		dp = get_dp(net, ovs_header->dp_ifindex);
+		if (!dp)
+			return ERR_PTR(-ENODEV);
+
+		vport = ovs_vport_ovsl_rcu(dp, port_no);
+		if (!vport)
+			return ERR_PTR(-ENODEV);
+		return vport;
+	} else
+		return ERR_PTR(-EINVAL);
+
+}
+
+/* Called with ovs_mutex */
+static void update_headroom(struct datapath *dp)
+{
+	unsigned dev_headroom, max_headroom = 0;
+	struct net_device *dev;
+	struct vport *vport;
+	int i;
+
+	for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
+		hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node) {
+			dev = vport->dev;
+			dev_headroom = netdev_get_fwd_headroom(dev);
+			if (dev_headroom > max_headroom)
+				max_headroom = dev_headroom;
+		}
+	}
+
+	dp->max_headroom = max_headroom;
+	for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++)
+		hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node)
+			netdev_set_rx_headroom(vport->dev, max_headroom);
+}
+
+static int ovs_vport_cmd_new(struct sk_buff *skb, struct genl_info *info)
+{
+	struct nlattr **a = info->attrs;
+	struct ovs_header *ovs_header = info->userhdr;
+	struct vport_parms parms;
+	struct sk_buff *reply;
+	struct vport *vport;
+	struct datapath *dp;
+	u32 port_no;
+	int err;
+
+	if (!a[OVS_VPORT_ATTR_NAME] || !a[OVS_VPORT_ATTR_TYPE] ||
+	    !a[OVS_VPORT_ATTR_UPCALL_PID])
+		return -EINVAL;
+	if (a[OVS_VPORT_ATTR_IFINDEX])
+		return -EOPNOTSUPP;
+
+	port_no = a[OVS_VPORT_ATTR_PORT_NO]
+		? nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]) : 0;
+	if (port_no >= DP_MAX_PORTS)
+		return -EFBIG;
+
+	reply = ovs_vport_cmd_alloc_info();
+	if (!reply)
+		return -ENOMEM;
+
+	ovs_lock();
+restart:
+	dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
+	err = -ENODEV;
+	if (!dp)
+		goto exit_unlock_free;
+
+	if (port_no) {
+		vport = ovs_vport_ovsl(dp, port_no);
+		err = -EBUSY;
+		if (vport)
+			goto exit_unlock_free;
+	} else {
+		for (port_no = 1; ; port_no++) {
+			if (port_no >= DP_MAX_PORTS) {
+				err = -EFBIG;
+				goto exit_unlock_free;
+			}
+			vport = ovs_vport_ovsl(dp, port_no);
+			if (!vport)
+				break;
+		}
+	}
+
+	parms.name = nla_data(a[OVS_VPORT_ATTR_NAME]);
+	parms.type = nla_get_u32(a[OVS_VPORT_ATTR_TYPE]);
+	parms.options = a[OVS_VPORT_ATTR_OPTIONS];
+	parms.dp = dp;
+	parms.port_no = port_no;
+	parms.upcall_portids = a[OVS_VPORT_ATTR_UPCALL_PID];
+
+	vport = new_vport(&parms);
+	err = PTR_ERR(vport);
+	if (IS_ERR(vport)) {
+		if (err == -EAGAIN)
+			goto restart;
+		goto exit_unlock_free;
+	}
+
+	err = ovs_vport_cmd_fill_info(vport, reply, genl_info_net(info),
+				      info->snd_portid, info->snd_seq, 0,
+				      OVS_VPORT_CMD_NEW, GFP_KERNEL);
+
+	if (netdev_get_fwd_headroom(vport->dev) > dp->max_headroom)
+		update_headroom(dp);
+	else
+		netdev_set_rx_headroom(vport->dev, dp->max_headroom);
+
+	BUG_ON(err < 0);
+	ovs_unlock();
+
+	ovs_notify(&dp_vport_genl_family, reply, info);
+	return 0;
+
+exit_unlock_free:
+	ovs_unlock();
+	kfree_skb(reply);
+	return err;
+}
+
+static int ovs_vport_cmd_set(struct sk_buff *skb, struct genl_info *info)
+{
+	struct nlattr **a = info->attrs;
+	struct sk_buff *reply;
+	struct vport *vport;
+	int err;
+
+	reply = ovs_vport_cmd_alloc_info();
+	if (!reply)
+		return -ENOMEM;
+
+	ovs_lock();
+	vport = lookup_vport(sock_net(skb->sk), info->userhdr, a);
+	err = PTR_ERR(vport);
+	if (IS_ERR(vport))
+		goto exit_unlock_free;
+
+	if (a[OVS_VPORT_ATTR_TYPE] &&
+	    nla_get_u32(a[OVS_VPORT_ATTR_TYPE]) != vport->ops->type) {
+		err = -EINVAL;
+		goto exit_unlock_free;
+	}
+
+	if (a[OVS_VPORT_ATTR_OPTIONS]) {
+		err = ovs_vport_set_options(vport, a[OVS_VPORT_ATTR_OPTIONS]);
+		if (err)
+			goto exit_unlock_free;
+	}
+
+
+	if (a[OVS_VPORT_ATTR_UPCALL_PID]) {
+		struct nlattr *ids = a[OVS_VPORT_ATTR_UPCALL_PID];
+
+		err = ovs_vport_set_upcall_portids(vport, ids);
+		if (err)
+			goto exit_unlock_free;
+	}
+
+	err = ovs_vport_cmd_fill_info(vport, reply, genl_info_net(info),
+				      info->snd_portid, info->snd_seq, 0,
+				      OVS_VPORT_CMD_NEW, GFP_ATOMIC);
+	BUG_ON(err < 0);
+
+	ovs_unlock();
+	ovs_notify(&dp_vport_genl_family, reply, info);
+	return 0;
+
+exit_unlock_free:
+	ovs_unlock();
+	kfree_skb(reply);
+	return err;
+}
+
+static int ovs_vport_cmd_del(struct sk_buff *skb, struct genl_info *info)
+{
+	bool must_update_headroom = false;
+	struct nlattr **a = info->attrs;
+	struct sk_buff *reply;
+	struct datapath *dp;
+	struct vport *vport;
+	int err;
+
+	reply = ovs_vport_cmd_alloc_info();
+	if (!reply)
+		return -ENOMEM;
+
+	ovs_lock();
+	vport = lookup_vport(sock_net(skb->sk), info->userhdr, a);
+	err = PTR_ERR(vport);
+	if (IS_ERR(vport))
+		goto exit_unlock_free;
+
+	if (vport->port_no == OVSP_LOCAL) {
+		err = -EINVAL;
+		goto exit_unlock_free;
+	}
+
+	err = ovs_vport_cmd_fill_info(vport, reply, genl_info_net(info),
+				      info->snd_portid, info->snd_seq, 0,
+				      OVS_VPORT_CMD_DEL, GFP_KERNEL);
+	BUG_ON(err < 0);
+
+	/* the vport deletion may trigger dp headroom update */
+	dp = vport->dp;
+	if (netdev_get_fwd_headroom(vport->dev) == dp->max_headroom)
+		must_update_headroom = true;
+	netdev_reset_rx_headroom(vport->dev);
+	ovs_dp_detach_port(vport);
+
+	if (must_update_headroom)
+		update_headroom(dp);
+	ovs_unlock();
+
+	ovs_notify(&dp_vport_genl_family, reply, info);
+	return 0;
+
+exit_unlock_free:
+	ovs_unlock();
+	kfree_skb(reply);
+	return err;
+}
+
+static int ovs_vport_cmd_get(struct sk_buff *skb, struct genl_info *info)
+{
+	struct nlattr **a = info->attrs;
+	struct ovs_header *ovs_header = info->userhdr;
+	struct sk_buff *reply;
+	struct vport *vport;
+	int err;
+
+	reply = ovs_vport_cmd_alloc_info();
+	if (!reply)
+		return -ENOMEM;
+
+	rcu_read_lock();
+	vport = lookup_vport(sock_net(skb->sk), ovs_header, a);
+	err = PTR_ERR(vport);
+	if (IS_ERR(vport))
+		goto exit_unlock_free;
+	err = ovs_vport_cmd_fill_info(vport, reply, genl_info_net(info),
+				      info->snd_portid, info->snd_seq, 0,
+				      OVS_VPORT_CMD_NEW, GFP_ATOMIC);
+	BUG_ON(err < 0);
+	rcu_read_unlock();
+
+	return genlmsg_reply(reply, info);
+
+exit_unlock_free:
+	rcu_read_unlock();
+	kfree_skb(reply);
+	return err;
+}
+
+static int ovs_vport_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
+{
+	struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
+	struct datapath *dp;
+	int bucket = cb->args[0], skip = cb->args[1];
+	int i, j = 0;
+
+	rcu_read_lock();
+	dp = get_dp_rcu(sock_net(skb->sk), ovs_header->dp_ifindex);
+	if (!dp) {
+		rcu_read_unlock();
+		return -ENODEV;
+	}
+	for (i = bucket; i < DP_VPORT_HASH_BUCKETS; i++) {
+		struct vport *vport;
+
+		j = 0;
+		hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node) {
+			if (j >= skip &&
+			    ovs_vport_cmd_fill_info(vport, skb,
+						    sock_net(skb->sk),
+						    NETLINK_CB(cb->skb).portid,
+						    cb->nlh->nlmsg_seq,
+						    NLM_F_MULTI,
+						    OVS_VPORT_CMD_NEW,
+						    GFP_ATOMIC) < 0)
+				goto out;
+
+			j++;
+		}
+		skip = 0;
+	}
+out:
+	rcu_read_unlock();
+
+	cb->args[0] = i;
+	cb->args[1] = j;
+
+	return skb->len;
+}
+
+static const struct nla_policy vport_policy[OVS_VPORT_ATTR_MAX + 1] = {
+	[OVS_VPORT_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
+	[OVS_VPORT_ATTR_STATS] = { .len = sizeof(struct ovs_vport_stats) },
+	[OVS_VPORT_ATTR_PORT_NO] = { .type = NLA_U32 },
+	[OVS_VPORT_ATTR_TYPE] = { .type = NLA_U32 },
+	[OVS_VPORT_ATTR_UPCALL_PID] = { .type = NLA_UNSPEC },
+	[OVS_VPORT_ATTR_OPTIONS] = { .type = NLA_NESTED },
+	[OVS_VPORT_ATTR_IFINDEX] = { .type = NLA_U32 },
+	[OVS_VPORT_ATTR_NETNSID] = { .type = NLA_S32 },
+};
+
+static const struct genl_ops dp_vport_genl_ops[] = {
+	{ .cmd = OVS_VPORT_CMD_NEW,
+	  .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
+	  .policy = vport_policy,
+	  .doit = ovs_vport_cmd_new
+	},
+	{ .cmd = OVS_VPORT_CMD_DEL,
+	  .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
+	  .policy = vport_policy,
+	  .doit = ovs_vport_cmd_del
+	},
+	{ .cmd = OVS_VPORT_CMD_GET,
+	  .flags = 0,		    /* OK for unprivileged users. */
+	  .policy = vport_policy,
+	  .doit = ovs_vport_cmd_get,
+	  .dumpit = ovs_vport_cmd_dump
+	},
+	{ .cmd = OVS_VPORT_CMD_SET,
+	  .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
+	  .policy = vport_policy,
+	  .doit = ovs_vport_cmd_set,
+	},
+};
+
+struct genl_family dp_vport_genl_family __ro_after_init = {
+	.hdrsize = sizeof(struct ovs_header),
+	.name = OVS_VPORT_FAMILY,
+	.version = OVS_VPORT_VERSION,
+	.maxattr = OVS_VPORT_ATTR_MAX,
+	.netnsok = true,
+	.parallel_ops = true,
+	.ops = dp_vport_genl_ops,
+	.n_ops = ARRAY_SIZE(dp_vport_genl_ops),
+	.mcgrps = &ovs_dp_vport_multicast_group,
+	.n_mcgrps = 1,
+	.module = THIS_MODULE,
+};
+
+static struct genl_family * const dp_genl_families[] = {
+	&dp_datapath_genl_family,
+	&dp_vport_genl_family,
+	&dp_flow_genl_family,
+	&dp_packet_genl_family,
+	&dp_meter_genl_family,
+#if	IS_ENABLED(CONFIG_NETFILTER_CONNCOUNT)
+	&dp_ct_limit_genl_family,
+#endif
+};
+
+static void dp_unregister_genl(int n_families)
+{
+	int i;
+
+	for (i = 0; i < n_families; i++)
+		genl_unregister_family(dp_genl_families[i]);
+}
+
+static int __init dp_register_genl(void)
+{
+	int err;
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(dp_genl_families); i++) {
+
+		err = genl_register_family(dp_genl_families[i]);
+		if (err)
+			goto error;
+	}
+
+	return 0;
+
+error:
+	dp_unregister_genl(i);
+	return err;
+}
+
+static int __net_init ovs_init_net(struct net *net)
+{
+	struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
+
+	INIT_LIST_HEAD(&ovs_net->dps);
+	INIT_WORK(&ovs_net->dp_notify_work, ovs_dp_notify_wq);
+	return ovs_ct_init(net);
+}
+
+static void __net_exit list_vports_from_net(struct net *net, struct net *dnet,
+					    struct list_head *head)
+{
+	struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
+	struct datapath *dp;
+
+	list_for_each_entry(dp, &ovs_net->dps, list_node) {
+		int i;
+
+		for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
+			struct vport *vport;
+
+			hlist_for_each_entry(vport, &dp->ports[i], dp_hash_node) {
+				if (vport->ops->type != OVS_VPORT_TYPE_INTERNAL)
+					continue;
+
+				if (dev_net(vport->dev) == dnet)
+					list_add(&vport->detach_list, head);
+			}
+		}
+	}
+}
+
+static void __net_exit ovs_exit_net(struct net *dnet)
+{
+	struct datapath *dp, *dp_next;
+	struct ovs_net *ovs_net = net_generic(dnet, ovs_net_id);
+	struct vport *vport, *vport_next;
+	struct net *net;
+	LIST_HEAD(head);
+
+	ovs_ct_exit(dnet);
+	ovs_lock();
+	list_for_each_entry_safe(dp, dp_next, &ovs_net->dps, list_node)
+		__dp_destroy(dp);
+
+	down_read(&net_rwsem);
+	for_each_net(net)
+		list_vports_from_net(net, dnet, &head);
+	up_read(&net_rwsem);
+
+	/* Detach all vports from given namespace. */
+	list_for_each_entry_safe(vport, vport_next, &head, detach_list) {
+		list_del(&vport->detach_list);
+		ovs_dp_detach_port(vport);
+	}
+
+	ovs_unlock();
+
+	cancel_work_sync(&ovs_net->dp_notify_work);
+}
+
+static struct pernet_operations ovs_net_ops = {
+	.init = ovs_init_net,
+	.exit = ovs_exit_net,
+	.id   = &ovs_net_id,
+	.size = sizeof(struct ovs_net),
+};
+
+static int __init dp_init(void)
+{
+	int err;
+
+	BUILD_BUG_ON(sizeof(struct ovs_skb_cb) > FIELD_SIZEOF(struct sk_buff, cb));
+
+	pr_info("Open vSwitch switching datapath\n");
+
+	err = action_fifos_init();
+	if (err)
+		goto error;
+
+	err = ovs_internal_dev_rtnl_link_register();
+	if (err)
+		goto error_action_fifos_exit;
+
+	err = ovs_flow_init();
+	if (err)
+		goto error_unreg_rtnl_link;
+
+	err = ovs_vport_init();
+	if (err)
+		goto error_flow_exit;
+
+	err = register_pernet_device(&ovs_net_ops);
+	if (err)
+		goto error_vport_exit;
+
+	err = register_netdevice_notifier(&ovs_dp_device_notifier);
+	if (err)
+		goto error_netns_exit;
+
+	err = ovs_netdev_init();
+	if (err)
+		goto error_unreg_notifier;
+
+	err = dp_register_genl();
+	if (err < 0)
+		goto error_unreg_netdev;
+
+	return 0;
+
+error_unreg_netdev:
+	ovs_netdev_exit();
+error_unreg_notifier:
+	unregister_netdevice_notifier(&ovs_dp_device_notifier);
+error_netns_exit:
+	unregister_pernet_device(&ovs_net_ops);
+error_vport_exit:
+	ovs_vport_exit();
+error_flow_exit:
+	ovs_flow_exit();
+error_unreg_rtnl_link:
+	ovs_internal_dev_rtnl_link_unregister();
+error_action_fifos_exit:
+	action_fifos_exit();
+error:
+	return err;
+}
+
+static void dp_cleanup(void)
+{
+	dp_unregister_genl(ARRAY_SIZE(dp_genl_families));
+	ovs_netdev_exit();
+	unregister_netdevice_notifier(&ovs_dp_device_notifier);
+	unregister_pernet_device(&ovs_net_ops);
+	rcu_barrier();
+	ovs_vport_exit();
+	ovs_flow_exit();
+	ovs_internal_dev_rtnl_link_unregister();
+	action_fifos_exit();
+}
+
+module_init(dp_init);
+module_exit(dp_cleanup);
+
+MODULE_DESCRIPTION("Open vSwitch switching datapath");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS_GENL_FAMILY(OVS_DATAPATH_FAMILY);
+MODULE_ALIAS_GENL_FAMILY(OVS_VPORT_FAMILY);
+MODULE_ALIAS_GENL_FAMILY(OVS_FLOW_FAMILY);
+MODULE_ALIAS_GENL_FAMILY(OVS_PACKET_FAMILY);
+MODULE_ALIAS_GENL_FAMILY(OVS_METER_FAMILY);
+MODULE_ALIAS_GENL_FAMILY(OVS_CT_LIMIT_FAMILY);
diff --git a/net/openvswitch/datapath.h b/net/openvswitch/datapath.h
new file mode 100644
index 000000000..c9eb267c6
--- /dev/null
+++ b/net/openvswitch/datapath.h
@@ -0,0 +1,261 @@
+/*
+ * Copyright (c) 2007-2014 Nicira, Inc.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of version 2 of the GNU General Public
+ * License as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA
+ */
+
+#ifndef DATAPATH_H
+#define DATAPATH_H 1
+
+#include <asm/page.h>
+#include <linux/kernel.h>
+#include <linux/mutex.h>
+#include <linux/netdevice.h>
+#include <linux/skbuff.h>
+#include <linux/u64_stats_sync.h>
+#include <net/ip_tunnels.h>
+
+#include "conntrack.h"
+#include "flow.h"
+#include "flow_table.h"
+#include "meter.h"
+#include "vport-internal_dev.h"
+
+#define DP_MAX_PORTS           USHRT_MAX
+#define DP_VPORT_HASH_BUCKETS  1024
+
+/**
+ * struct dp_stats_percpu - per-cpu packet processing statistics for a given
+ * datapath.
+ * @n_hit: Number of received packets for which a matching flow was found in
+ * the flow table.
+ * @n_miss: Number of received packets that had no matching flow in the flow
+ * table.  The sum of @n_hit and @n_miss is the number of packets that have
+ * been received by the datapath.
+ * @n_lost: Number of received packets that had no matching flow in the flow
+ * table that could not be sent to userspace (normally due to an overflow in
+ * one of the datapath's queues).
+ * @n_mask_hit: Number of masks looked up for flow match.
+ *   @n_mask_hit / (@n_hit + @n_missed)  will be the average masks looked
+ *   up per packet.
+ */
+struct dp_stats_percpu {
+	u64 n_hit;
+	u64 n_missed;
+	u64 n_lost;
+	u64 n_mask_hit;
+	struct u64_stats_sync syncp;
+};
+
+/**
+ * struct datapath - datapath for flow-based packet switching
+ * @rcu: RCU callback head for deferred destruction.
+ * @list_node: Element in global 'dps' list.
+ * @table: flow table.
+ * @ports: Hash table for ports.  %OVSP_LOCAL port always exists.  Protected by
+ * ovs_mutex and RCU.
+ * @stats_percpu: Per-CPU datapath statistics.
+ * @net: Reference to net namespace.
+ * @max_headroom: the maximum headroom of all vports in this datapath; it will
+ * be used by all the internal vports in this dp.
+ *
+ * Context: See the comment on locking at the top of datapath.c for additional
+ * locking information.
+ */
+struct datapath {
+	struct rcu_head rcu;
+	struct list_head list_node;
+
+	/* Flow table. */
+	struct flow_table table;
+
+	/* Switch ports. */
+	struct hlist_head *ports;
+
+	/* Stats. */
+	struct dp_stats_percpu __percpu *stats_percpu;
+
+	/* Network namespace ref. */
+	possible_net_t net;
+
+	u32 user_features;
+
+	u32 max_headroom;
+
+	/* Switch meters. */
+	struct hlist_head *meters;
+};
+
+/**
+ * struct ovs_skb_cb - OVS data in skb CB
+ * @input_vport: The original vport packet came in on. This value is cached
+ * when a packet is received by OVS.
+ * @mru: The maximum received fragement size; 0 if the packet is not
+ * fragmented.
+ * @acts_origlen: The netlink size of the flow actions applied to this skb.
+ * @cutlen: The number of bytes from the packet end to be removed.
+ */
+struct ovs_skb_cb {
+	struct vport		*input_vport;
+	u16			mru;
+	u16			acts_origlen;
+	u32			cutlen;
+};
+#define OVS_CB(skb) ((struct ovs_skb_cb *)(skb)->cb)
+
+/**
+ * struct dp_upcall - metadata to include with a packet to send to userspace
+ * @cmd: One of %OVS_PACKET_CMD_*.
+ * @userdata: If nonnull, its variable-length value is passed to userspace as
+ * %OVS_PACKET_ATTR_USERDATA.
+ * @portid: Netlink portid to which packet should be sent.  If @portid is 0
+ * then no packet is sent and the packet is accounted in the datapath's @n_lost
+ * counter.
+ * @egress_tun_info: If nonnull, becomes %OVS_PACKET_ATTR_EGRESS_TUN_KEY.
+ * @mru: If not zero, Maximum received IP fragment size.
+ */
+struct dp_upcall_info {
+	struct ip_tunnel_info *egress_tun_info;
+	const struct nlattr *userdata;
+	const struct nlattr *actions;
+	int actions_len;
+	u32 portid;
+	u8 cmd;
+	u16 mru;
+};
+
+/**
+ * struct ovs_net - Per net-namespace data for ovs.
+ * @dps: List of datapaths to enable dumping them all out.
+ * Protected by genl_mutex.
+ */
+struct ovs_net {
+	struct list_head dps;
+	struct work_struct dp_notify_work;
+#if	IS_ENABLED(CONFIG_NETFILTER_CONNCOUNT)
+	struct ovs_ct_limit_info *ct_limit_info;
+#endif
+
+	/* Module reference for configuring conntrack. */
+	bool xt_label;
+};
+
+extern unsigned int ovs_net_id;
+void ovs_lock(void);
+void ovs_unlock(void);
+
+#ifdef CONFIG_LOCKDEP
+int lockdep_ovsl_is_held(void);
+#else
+#define lockdep_ovsl_is_held()	1
+#endif
+
+#define ASSERT_OVSL()		WARN_ON(!lockdep_ovsl_is_held())
+#define ovsl_dereference(p)					\
+	rcu_dereference_protected(p, lockdep_ovsl_is_held())
+#define rcu_dereference_ovsl(p)					\
+	rcu_dereference_check(p, lockdep_ovsl_is_held())
+
+static inline struct net *ovs_dp_get_net(const struct datapath *dp)
+{
+	return read_pnet(&dp->net);
+}
+
+static inline void ovs_dp_set_net(struct datapath *dp, struct net *net)
+{
+	write_pnet(&dp->net, net);
+}
+
+struct vport *ovs_lookup_vport(const struct datapath *dp, u16 port_no);
+
+static inline struct vport *ovs_vport_rcu(const struct datapath *dp, int port_no)
+{
+	WARN_ON_ONCE(!rcu_read_lock_held());
+	return ovs_lookup_vport(dp, port_no);
+}
+
+static inline struct vport *ovs_vport_ovsl_rcu(const struct datapath *dp, int port_no)
+{
+	WARN_ON_ONCE(!rcu_read_lock_held() && !lockdep_ovsl_is_held());
+	return ovs_lookup_vport(dp, port_no);
+}
+
+static inline struct vport *ovs_vport_ovsl(const struct datapath *dp, int port_no)
+{
+	ASSERT_OVSL();
+	return ovs_lookup_vport(dp, port_no);
+}
+
+/* Must be called with rcu_read_lock. */
+static inline struct datapath *get_dp_rcu(struct net *net, int dp_ifindex)
+{
+	struct net_device *dev = dev_get_by_index_rcu(net, dp_ifindex);
+
+	if (dev) {
+		struct vport *vport = ovs_internal_dev_get_vport(dev);
+
+		if (vport)
+			return vport->dp;
+	}
+
+	return NULL;
+}
+
+/* The caller must hold either ovs_mutex or rcu_read_lock to keep the
+ * returned dp pointer valid.
+ */
+static inline struct datapath *get_dp(struct net *net, int dp_ifindex)
+{
+	struct datapath *dp;
+
+	WARN_ON_ONCE(!rcu_read_lock_held() && !lockdep_ovsl_is_held());
+	rcu_read_lock();
+	dp = get_dp_rcu(net, dp_ifindex);
+	rcu_read_unlock();
+
+	return dp;
+}
+
+extern struct notifier_block ovs_dp_device_notifier;
+extern struct genl_family dp_vport_genl_family;
+
+void ovs_dp_process_packet(struct sk_buff *skb, struct sw_flow_key *key);
+void ovs_dp_detach_port(struct vport *);
+int ovs_dp_upcall(struct datapath *, struct sk_buff *,
+		  const struct sw_flow_key *, const struct dp_upcall_info *,
+		  uint32_t cutlen);
+
+const char *ovs_dp_name(const struct datapath *dp);
+struct sk_buff *ovs_vport_cmd_build_info(struct vport *vport, struct net *net,
+					 u32 portid, u32 seq, u8 cmd);
+
+int ovs_execute_actions(struct datapath *dp, struct sk_buff *skb,
+			const struct sw_flow_actions *, struct sw_flow_key *);
+
+void ovs_dp_notify_wq(struct work_struct *work);
+
+int action_fifos_init(void);
+void action_fifos_exit(void);
+
+/* 'KEY' must not have any bits set outside of the 'MASK' */
+#define OVS_MASKED(OLD, KEY, MASK) ((KEY) | ((OLD) & ~(MASK)))
+#define OVS_SET_MASKED(OLD, KEY, MASK) ((OLD) = OVS_MASKED(OLD, KEY, MASK))
+
+#define OVS_NLERR(logging_allowed, fmt, ...)			\
+do {								\
+	if (logging_allowed && net_ratelimit())			\
+		pr_info("netlink: " fmt "\n", ##__VA_ARGS__);	\
+} while (0)
+#endif /* datapath.h */
diff --git a/net/openvswitch/dp_notify.c b/net/openvswitch/dp_notify.c
new file mode 100644
index 000000000..f3ee2f282
--- /dev/null
+++ b/net/openvswitch/dp_notify.c
@@ -0,0 +1,99 @@
+/*
+ * Copyright (c) 2007-2012 Nicira, Inc.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of version 2 of the GNU General Public
+ * License as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA
+ */
+
+#include <linux/netdevice.h>
+#include <net/genetlink.h>
+#include <net/netns/generic.h>
+
+#include "datapath.h"
+#include "vport-internal_dev.h"
+#include "vport-netdev.h"
+
+static void dp_detach_port_notify(struct vport *vport)
+{
+	struct sk_buff *notify;
+	struct datapath *dp;
+
+	dp = vport->dp;
+	notify = ovs_vport_cmd_build_info(vport, ovs_dp_get_net(dp),
+					  0, 0, OVS_VPORT_CMD_DEL);
+	ovs_dp_detach_port(vport);
+	if (IS_ERR(notify)) {
+		genl_set_err(&dp_vport_genl_family, ovs_dp_get_net(dp), 0,
+			     0, PTR_ERR(notify));
+		return;
+	}
+
+	genlmsg_multicast_netns(&dp_vport_genl_family,
+				ovs_dp_get_net(dp), notify, 0,
+				0, GFP_KERNEL);
+}
+
+void ovs_dp_notify_wq(struct work_struct *work)
+{
+	struct ovs_net *ovs_net = container_of(work, struct ovs_net, dp_notify_work);
+	struct datapath *dp;
+
+	ovs_lock();
+	list_for_each_entry(dp, &ovs_net->dps, list_node) {
+		int i;
+
+		for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
+			struct vport *vport;
+			struct hlist_node *n;
+
+			hlist_for_each_entry_safe(vport, n, &dp->ports[i], dp_hash_node) {
+				if (vport->ops->type == OVS_VPORT_TYPE_INTERNAL)
+					continue;
+
+				if (!(vport->dev->priv_flags & IFF_OVS_DATAPATH))
+					dp_detach_port_notify(vport);
+			}
+		}
+	}
+	ovs_unlock();
+}
+
+static int dp_device_event(struct notifier_block *unused, unsigned long event,
+			   void *ptr)
+{
+	struct ovs_net *ovs_net;
+	struct net_device *dev = netdev_notifier_info_to_dev(ptr);
+	struct vport *vport = NULL;
+
+	if (!ovs_is_internal_dev(dev))
+		vport = ovs_netdev_get_vport(dev);
+
+	if (!vport)
+		return NOTIFY_DONE;
+
+	if (event == NETDEV_UNREGISTER) {
+		/* upper_dev_unlink and decrement promisc immediately */
+		ovs_netdev_detach_dev(vport);
+
+		/* schedule vport destroy, dev_put and genl notification */
+		ovs_net = net_generic(dev_net(dev), ovs_net_id);
+		queue_work(system_wq, &ovs_net->dp_notify_work);
+	}
+
+	return NOTIFY_DONE;
+}
+
+struct notifier_block ovs_dp_device_notifier = {
+	.notifier_call = dp_device_event
+};
diff --git a/net/openvswitch/flow.c b/net/openvswitch/flow.c
new file mode 100644
index 000000000..56b8e7167
--- /dev/null
+++ b/net/openvswitch/flow.c
@@ -0,0 +1,918 @@
+/*
+ * Copyright (c) 2007-2014 Nicira, Inc.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of version 2 of the GNU General Public
+ * License as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA
+ */
+
+#include <linux/uaccess.h>
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/if_ether.h>
+#include <linux/if_vlan.h>
+#include <net/llc_pdu.h>
+#include <linux/kernel.h>
+#include <linux/jhash.h>
+#include <linux/jiffies.h>
+#include <linux/llc.h>
+#include <linux/module.h>
+#include <linux/in.h>
+#include <linux/rcupdate.h>
+#include <linux/cpumask.h>
+#include <linux/if_arp.h>
+#include <linux/ip.h>
+#include <linux/ipv6.h>
+#include <linux/mpls.h>
+#include <linux/sctp.h>
+#include <linux/smp.h>
+#include <linux/tcp.h>
+#include <linux/udp.h>
+#include <linux/icmp.h>
+#include <linux/icmpv6.h>
+#include <linux/rculist.h>
+#include <net/ip.h>
+#include <net/ip_tunnels.h>
+#include <net/ipv6.h>
+#include <net/mpls.h>
+#include <net/ndisc.h>
+#include <net/nsh.h>
+
+#include "conntrack.h"
+#include "datapath.h"
+#include "flow.h"
+#include "flow_netlink.h"
+#include "vport.h"
+
+u64 ovs_flow_used_time(unsigned long flow_jiffies)
+{
+	struct timespec64 cur_ts;
+	u64 cur_ms, idle_ms;
+
+	ktime_get_ts64(&cur_ts);
+	idle_ms = jiffies_to_msecs(jiffies - flow_jiffies);
+	cur_ms = (u64)(u32)cur_ts.tv_sec * MSEC_PER_SEC +
+		 cur_ts.tv_nsec / NSEC_PER_MSEC;
+
+	return cur_ms - idle_ms;
+}
+
+#define TCP_FLAGS_BE16(tp) (*(__be16 *)&tcp_flag_word(tp) & htons(0x0FFF))
+
+void ovs_flow_stats_update(struct sw_flow *flow, __be16 tcp_flags,
+			   const struct sk_buff *skb)
+{
+	struct flow_stats *stats;
+	unsigned int cpu = smp_processor_id();
+	int len = skb->len + (skb_vlan_tag_present(skb) ? VLAN_HLEN : 0);
+
+	stats = rcu_dereference(flow->stats[cpu]);
+
+	/* Check if already have CPU-specific stats. */
+	if (likely(stats)) {
+		spin_lock(&stats->lock);
+		/* Mark if we write on the pre-allocated stats. */
+		if (cpu == 0 && unlikely(flow->stats_last_writer != cpu))
+			flow->stats_last_writer = cpu;
+	} else {
+		stats = rcu_dereference(flow->stats[0]); /* Pre-allocated. */
+		spin_lock(&stats->lock);
+
+		/* If the current CPU is the only writer on the
+		 * pre-allocated stats keep using them.
+		 */
+		if (unlikely(flow->stats_last_writer != cpu)) {
+			/* A previous locker may have already allocated the
+			 * stats, so we need to check again.  If CPU-specific
+			 * stats were already allocated, we update the pre-
+			 * allocated stats as we have already locked them.
+			 */
+			if (likely(flow->stats_last_writer != -1) &&
+			    likely(!rcu_access_pointer(flow->stats[cpu]))) {
+				/* Try to allocate CPU-specific stats. */
+				struct flow_stats *new_stats;
+
+				new_stats =
+					kmem_cache_alloc_node(flow_stats_cache,
+							      GFP_NOWAIT |
+							      __GFP_THISNODE |
+							      __GFP_NOWARN |
+							      __GFP_NOMEMALLOC,
+							      numa_node_id());
+				if (likely(new_stats)) {
+					new_stats->used = jiffies;
+					new_stats->packet_count = 1;
+					new_stats->byte_count = len;
+					new_stats->tcp_flags = tcp_flags;
+					spin_lock_init(&new_stats->lock);
+
+					rcu_assign_pointer(flow->stats[cpu],
+							   new_stats);
+					cpumask_set_cpu(cpu, &flow->cpu_used_mask);
+					goto unlock;
+				}
+			}
+			flow->stats_last_writer = cpu;
+		}
+	}
+
+	stats->used = jiffies;
+	stats->packet_count++;
+	stats->byte_count += len;
+	stats->tcp_flags |= tcp_flags;
+unlock:
+	spin_unlock(&stats->lock);
+}
+
+/* Must be called with rcu_read_lock or ovs_mutex. */
+void ovs_flow_stats_get(const struct sw_flow *flow,
+			struct ovs_flow_stats *ovs_stats,
+			unsigned long *used, __be16 *tcp_flags)
+{
+	int cpu;
+
+	*used = 0;
+	*tcp_flags = 0;
+	memset(ovs_stats, 0, sizeof(*ovs_stats));
+
+	/* We open code this to make sure cpu 0 is always considered */
+	for (cpu = 0; cpu < nr_cpu_ids; cpu = cpumask_next(cpu, &flow->cpu_used_mask)) {
+		struct flow_stats *stats = rcu_dereference_ovsl(flow->stats[cpu]);
+
+		if (stats) {
+			/* Local CPU may write on non-local stats, so we must
+			 * block bottom-halves here.
+			 */
+			spin_lock_bh(&stats->lock);
+			if (!*used || time_after(stats->used, *used))
+				*used = stats->used;
+			*tcp_flags |= stats->tcp_flags;
+			ovs_stats->n_packets += stats->packet_count;
+			ovs_stats->n_bytes += stats->byte_count;
+			spin_unlock_bh(&stats->lock);
+		}
+	}
+}
+
+/* Called with ovs_mutex. */
+void ovs_flow_stats_clear(struct sw_flow *flow)
+{
+	int cpu;
+
+	/* We open code this to make sure cpu 0 is always considered */
+	for (cpu = 0; cpu < nr_cpu_ids; cpu = cpumask_next(cpu, &flow->cpu_used_mask)) {
+		struct flow_stats *stats = ovsl_dereference(flow->stats[cpu]);
+
+		if (stats) {
+			spin_lock_bh(&stats->lock);
+			stats->used = 0;
+			stats->packet_count = 0;
+			stats->byte_count = 0;
+			stats->tcp_flags = 0;
+			spin_unlock_bh(&stats->lock);
+		}
+	}
+}
+
+static int check_header(struct sk_buff *skb, int len)
+{
+	if (unlikely(skb->len < len))
+		return -EINVAL;
+	if (unlikely(!pskb_may_pull(skb, len)))
+		return -ENOMEM;
+	return 0;
+}
+
+static bool arphdr_ok(struct sk_buff *skb)
+{
+	return pskb_may_pull(skb, skb_network_offset(skb) +
+				  sizeof(struct arp_eth_header));
+}
+
+static int check_iphdr(struct sk_buff *skb)
+{
+	unsigned int nh_ofs = skb_network_offset(skb);
+	unsigned int ip_len;
+	int err;
+
+	err = check_header(skb, nh_ofs + sizeof(struct iphdr));
+	if (unlikely(err))
+		return err;
+
+	ip_len = ip_hdrlen(skb);
+	if (unlikely(ip_len < sizeof(struct iphdr) ||
+		     skb->len < nh_ofs + ip_len))
+		return -EINVAL;
+
+	skb_set_transport_header(skb, nh_ofs + ip_len);
+	return 0;
+}
+
+static bool tcphdr_ok(struct sk_buff *skb)
+{
+	int th_ofs = skb_transport_offset(skb);
+	int tcp_len;
+
+	if (unlikely(!pskb_may_pull(skb, th_ofs + sizeof(struct tcphdr))))
+		return false;
+
+	tcp_len = tcp_hdrlen(skb);
+	if (unlikely(tcp_len < sizeof(struct tcphdr) ||
+		     skb->len < th_ofs + tcp_len))
+		return false;
+
+	return true;
+}
+
+static bool udphdr_ok(struct sk_buff *skb)
+{
+	return pskb_may_pull(skb, skb_transport_offset(skb) +
+				  sizeof(struct udphdr));
+}
+
+static bool sctphdr_ok(struct sk_buff *skb)
+{
+	return pskb_may_pull(skb, skb_transport_offset(skb) +
+				  sizeof(struct sctphdr));
+}
+
+static bool icmphdr_ok(struct sk_buff *skb)
+{
+	return pskb_may_pull(skb, skb_transport_offset(skb) +
+				  sizeof(struct icmphdr));
+}
+
+static int parse_ipv6hdr(struct sk_buff *skb, struct sw_flow_key *key)
+{
+	unsigned int nh_ofs = skb_network_offset(skb);
+	unsigned int nh_len;
+	int payload_ofs;
+	struct ipv6hdr *nh;
+	uint8_t nexthdr;
+	__be16 frag_off;
+	int err;
+
+	err = check_header(skb, nh_ofs + sizeof(*nh));
+	if (unlikely(err))
+		return err;
+
+	nh = ipv6_hdr(skb);
+	nexthdr = nh->nexthdr;
+	payload_ofs = (u8 *)(nh + 1) - skb->data;
+
+	key->ip.proto = NEXTHDR_NONE;
+	key->ip.tos = ipv6_get_dsfield(nh);
+	key->ip.ttl = nh->hop_limit;
+	key->ipv6.label = *(__be32 *)nh & htonl(IPV6_FLOWINFO_FLOWLABEL);
+	key->ipv6.addr.src = nh->saddr;
+	key->ipv6.addr.dst = nh->daddr;
+
+	payload_ofs = ipv6_skip_exthdr(skb, payload_ofs, &nexthdr, &frag_off);
+
+	if (frag_off) {
+		if (frag_off & htons(~0x7))
+			key->ip.frag = OVS_FRAG_TYPE_LATER;
+		else
+			key->ip.frag = OVS_FRAG_TYPE_FIRST;
+	} else {
+		key->ip.frag = OVS_FRAG_TYPE_NONE;
+	}
+
+	/* Delayed handling of error in ipv6_skip_exthdr() as it
+	 * always sets frag_off to a valid value which may be
+	 * used to set key->ip.frag above.
+	 */
+	if (unlikely(payload_ofs < 0))
+		return -EPROTO;
+
+	nh_len = payload_ofs - nh_ofs;
+	skb_set_transport_header(skb, nh_ofs + nh_len);
+	key->ip.proto = nexthdr;
+	return nh_len;
+}
+
+static bool icmp6hdr_ok(struct sk_buff *skb)
+{
+	return pskb_may_pull(skb, skb_transport_offset(skb) +
+				  sizeof(struct icmp6hdr));
+}
+
+/**
+ * Parse vlan tag from vlan header.
+ * Returns ERROR on memory error.
+ * Returns 0 if it encounters a non-vlan or incomplete packet.
+ * Returns 1 after successfully parsing vlan tag.
+ */
+static int parse_vlan_tag(struct sk_buff *skb, struct vlan_head *key_vh,
+			  bool untag_vlan)
+{
+	struct vlan_head *vh = (struct vlan_head *)skb->data;
+
+	if (likely(!eth_type_vlan(vh->tpid)))
+		return 0;
+
+	if (unlikely(skb->len < sizeof(struct vlan_head) + sizeof(__be16)))
+		return 0;
+
+	if (unlikely(!pskb_may_pull(skb, sizeof(struct vlan_head) +
+				 sizeof(__be16))))
+		return -ENOMEM;
+
+	vh = (struct vlan_head *)skb->data;
+	key_vh->tci = vh->tci | htons(VLAN_TAG_PRESENT);
+	key_vh->tpid = vh->tpid;
+
+	if (unlikely(untag_vlan)) {
+		int offset = skb->data - skb_mac_header(skb);
+		u16 tci;
+		int err;
+
+		__skb_push(skb, offset);
+		err = __skb_vlan_pop(skb, &tci);
+		__skb_pull(skb, offset);
+		if (err)
+			return err;
+		__vlan_hwaccel_put_tag(skb, key_vh->tpid, tci);
+	} else {
+		__skb_pull(skb, sizeof(struct vlan_head));
+	}
+	return 1;
+}
+
+static void clear_vlan(struct sw_flow_key *key)
+{
+	key->eth.vlan.tci = 0;
+	key->eth.vlan.tpid = 0;
+	key->eth.cvlan.tci = 0;
+	key->eth.cvlan.tpid = 0;
+}
+
+static int parse_vlan(struct sk_buff *skb, struct sw_flow_key *key)
+{
+	int res;
+
+	if (skb_vlan_tag_present(skb)) {
+		key->eth.vlan.tci = htons(skb->vlan_tci);
+		key->eth.vlan.tpid = skb->vlan_proto;
+	} else {
+		/* Parse outer vlan tag in the non-accelerated case. */
+		res = parse_vlan_tag(skb, &key->eth.vlan, true);
+		if (res <= 0)
+			return res;
+	}
+
+	/* Parse inner vlan tag. */
+	res = parse_vlan_tag(skb, &key->eth.cvlan, false);
+	if (res <= 0)
+		return res;
+
+	return 0;
+}
+
+static __be16 parse_ethertype(struct sk_buff *skb)
+{
+	struct llc_snap_hdr {
+		u8  dsap;  /* Always 0xAA */
+		u8  ssap;  /* Always 0xAA */
+		u8  ctrl;
+		u8  oui[3];
+		__be16 ethertype;
+	};
+	struct llc_snap_hdr *llc;
+	__be16 proto;
+
+	proto = *(__be16 *) skb->data;
+	__skb_pull(skb, sizeof(__be16));
+
+	if (eth_proto_is_802_3(proto))
+		return proto;
+
+	if (skb->len < sizeof(struct llc_snap_hdr))
+		return htons(ETH_P_802_2);
+
+	if (unlikely(!pskb_may_pull(skb, sizeof(struct llc_snap_hdr))))
+		return htons(0);
+
+	llc = (struct llc_snap_hdr *) skb->data;
+	if (llc->dsap != LLC_SAP_SNAP ||
+	    llc->ssap != LLC_SAP_SNAP ||
+	    (llc->oui[0] | llc->oui[1] | llc->oui[2]) != 0)
+		return htons(ETH_P_802_2);
+
+	__skb_pull(skb, sizeof(struct llc_snap_hdr));
+
+	if (eth_proto_is_802_3(llc->ethertype))
+		return llc->ethertype;
+
+	return htons(ETH_P_802_2);
+}
+
+static int parse_icmpv6(struct sk_buff *skb, struct sw_flow_key *key,
+			int nh_len)
+{
+	struct icmp6hdr *icmp = icmp6_hdr(skb);
+
+	/* The ICMPv6 type and code fields use the 16-bit transport port
+	 * fields, so we need to store them in 16-bit network byte order.
+	 */
+	key->tp.src = htons(icmp->icmp6_type);
+	key->tp.dst = htons(icmp->icmp6_code);
+	memset(&key->ipv6.nd, 0, sizeof(key->ipv6.nd));
+
+	if (icmp->icmp6_code == 0 &&
+	    (icmp->icmp6_type == NDISC_NEIGHBOUR_SOLICITATION ||
+	     icmp->icmp6_type == NDISC_NEIGHBOUR_ADVERTISEMENT)) {
+		int icmp_len = skb->len - skb_transport_offset(skb);
+		struct nd_msg *nd;
+		int offset;
+
+		/* In order to process neighbor discovery options, we need the
+		 * entire packet.
+		 */
+		if (unlikely(icmp_len < sizeof(*nd)))
+			return 0;
+
+		if (unlikely(skb_linearize(skb)))
+			return -ENOMEM;
+
+		nd = (struct nd_msg *)skb_transport_header(skb);
+		key->ipv6.nd.target = nd->target;
+
+		icmp_len -= sizeof(*nd);
+		offset = 0;
+		while (icmp_len >= 8) {
+			struct nd_opt_hdr *nd_opt =
+				 (struct nd_opt_hdr *)(nd->opt + offset);
+			int opt_len = nd_opt->nd_opt_len * 8;
+
+			if (unlikely(!opt_len || opt_len > icmp_len))
+				return 0;
+
+			/* Store the link layer address if the appropriate
+			 * option is provided.  It is considered an error if
+			 * the same link layer option is specified twice.
+			 */
+			if (nd_opt->nd_opt_type == ND_OPT_SOURCE_LL_ADDR
+			    && opt_len == 8) {
+				if (unlikely(!is_zero_ether_addr(key->ipv6.nd.sll)))
+					goto invalid;
+				ether_addr_copy(key->ipv6.nd.sll,
+						&nd->opt[offset+sizeof(*nd_opt)]);
+			} else if (nd_opt->nd_opt_type == ND_OPT_TARGET_LL_ADDR
+				   && opt_len == 8) {
+				if (unlikely(!is_zero_ether_addr(key->ipv6.nd.tll)))
+					goto invalid;
+				ether_addr_copy(key->ipv6.nd.tll,
+						&nd->opt[offset+sizeof(*nd_opt)]);
+			}
+
+			icmp_len -= opt_len;
+			offset += opt_len;
+		}
+	}
+
+	return 0;
+
+invalid:
+	memset(&key->ipv6.nd.target, 0, sizeof(key->ipv6.nd.target));
+	memset(key->ipv6.nd.sll, 0, sizeof(key->ipv6.nd.sll));
+	memset(key->ipv6.nd.tll, 0, sizeof(key->ipv6.nd.tll));
+
+	return 0;
+}
+
+static int parse_nsh(struct sk_buff *skb, struct sw_flow_key *key)
+{
+	struct nshhdr *nh;
+	unsigned int nh_ofs = skb_network_offset(skb);
+	u8 version, length;
+	int err;
+
+	err = check_header(skb, nh_ofs + NSH_BASE_HDR_LEN);
+	if (unlikely(err))
+		return err;
+
+	nh = nsh_hdr(skb);
+	version = nsh_get_ver(nh);
+	length = nsh_hdr_len(nh);
+
+	if (version != 0)
+		return -EINVAL;
+
+	err = check_header(skb, nh_ofs + length);
+	if (unlikely(err))
+		return err;
+
+	nh = nsh_hdr(skb);
+	key->nsh.base.flags = nsh_get_flags(nh);
+	key->nsh.base.ttl = nsh_get_ttl(nh);
+	key->nsh.base.mdtype = nh->mdtype;
+	key->nsh.base.np = nh->np;
+	key->nsh.base.path_hdr = nh->path_hdr;
+	switch (key->nsh.base.mdtype) {
+	case NSH_M_TYPE1:
+		if (length != NSH_M_TYPE1_LEN)
+			return -EINVAL;
+		memcpy(key->nsh.context, nh->md1.context,
+		       sizeof(nh->md1));
+		break;
+	case NSH_M_TYPE2:
+		memset(key->nsh.context, 0,
+		       sizeof(nh->md1));
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+/**
+ * key_extract - extracts a flow key from an Ethernet frame.
+ * @skb: sk_buff that contains the frame, with skb->data pointing to the
+ * Ethernet header
+ * @key: output flow key
+ *
+ * The caller must ensure that skb->len >= ETH_HLEN.
+ *
+ * Returns 0 if successful, otherwise a negative errno value.
+ *
+ * Initializes @skb header fields as follows:
+ *
+ *    - skb->mac_header: the L2 header.
+ *
+ *    - skb->network_header: just past the L2 header, or just past the
+ *      VLAN header, to the first byte of the L2 payload.
+ *
+ *    - skb->transport_header: If key->eth.type is ETH_P_IP or ETH_P_IPV6
+ *      on output, then just past the IP header, if one is present and
+ *      of a correct length, otherwise the same as skb->network_header.
+ *      For other key->eth.type values it is left untouched.
+ *
+ *    - skb->protocol: the type of the data starting at skb->network_header.
+ *      Equals to key->eth.type.
+ */
+static int key_extract(struct sk_buff *skb, struct sw_flow_key *key)
+{
+	int error;
+	struct ethhdr *eth;
+
+	/* Flags are always used as part of stats */
+	key->tp.flags = 0;
+
+	skb_reset_mac_header(skb);
+
+	/* Link layer. */
+	clear_vlan(key);
+	if (ovs_key_mac_proto(key) == MAC_PROTO_NONE) {
+		if (unlikely(eth_type_vlan(skb->protocol)))
+			return -EINVAL;
+
+		skb_reset_network_header(skb);
+		key->eth.type = skb->protocol;
+	} else {
+		eth = eth_hdr(skb);
+		ether_addr_copy(key->eth.src, eth->h_source);
+		ether_addr_copy(key->eth.dst, eth->h_dest);
+
+		__skb_pull(skb, 2 * ETH_ALEN);
+		/* We are going to push all headers that we pull, so no need to
+		* update skb->csum here.
+		*/
+
+		if (unlikely(parse_vlan(skb, key)))
+			return -ENOMEM;
+
+		key->eth.type = parse_ethertype(skb);
+		if (unlikely(key->eth.type == htons(0)))
+			return -ENOMEM;
+
+		/* Multiple tagged packets need to retain TPID to satisfy
+		 * skb_vlan_pop(), which will later shift the ethertype into
+		 * skb->protocol.
+		 */
+		if (key->eth.cvlan.tci & htons(VLAN_TAG_PRESENT))
+			skb->protocol = key->eth.cvlan.tpid;
+		else
+			skb->protocol = key->eth.type;
+
+		skb_reset_network_header(skb);
+		__skb_push(skb, skb->data - skb_mac_header(skb));
+	}
+	skb_reset_mac_len(skb);
+
+	/* Network layer. */
+	if (key->eth.type == htons(ETH_P_IP)) {
+		struct iphdr *nh;
+		__be16 offset;
+
+		error = check_iphdr(skb);
+		if (unlikely(error)) {
+			memset(&key->ip, 0, sizeof(key->ip));
+			memset(&key->ipv4, 0, sizeof(key->ipv4));
+			if (error == -EINVAL) {
+				skb->transport_header = skb->network_header;
+				error = 0;
+			}
+			return error;
+		}
+
+		nh = ip_hdr(skb);
+		key->ipv4.addr.src = nh->saddr;
+		key->ipv4.addr.dst = nh->daddr;
+
+		key->ip.proto = nh->protocol;
+		key->ip.tos = nh->tos;
+		key->ip.ttl = nh->ttl;
+
+		offset = nh->frag_off & htons(IP_OFFSET);
+		if (offset) {
+			key->ip.frag = OVS_FRAG_TYPE_LATER;
+			return 0;
+		}
+		if (nh->frag_off & htons(IP_MF) ||
+			skb_shinfo(skb)->gso_type & SKB_GSO_UDP)
+			key->ip.frag = OVS_FRAG_TYPE_FIRST;
+		else
+			key->ip.frag = OVS_FRAG_TYPE_NONE;
+
+		/* Transport layer. */
+		if (key->ip.proto == IPPROTO_TCP) {
+			if (tcphdr_ok(skb)) {
+				struct tcphdr *tcp = tcp_hdr(skb);
+				key->tp.src = tcp->source;
+				key->tp.dst = tcp->dest;
+				key->tp.flags = TCP_FLAGS_BE16(tcp);
+			} else {
+				memset(&key->tp, 0, sizeof(key->tp));
+			}
+
+		} else if (key->ip.proto == IPPROTO_UDP) {
+			if (udphdr_ok(skb)) {
+				struct udphdr *udp = udp_hdr(skb);
+				key->tp.src = udp->source;
+				key->tp.dst = udp->dest;
+			} else {
+				memset(&key->tp, 0, sizeof(key->tp));
+			}
+		} else if (key->ip.proto == IPPROTO_SCTP) {
+			if (sctphdr_ok(skb)) {
+				struct sctphdr *sctp = sctp_hdr(skb);
+				key->tp.src = sctp->source;
+				key->tp.dst = sctp->dest;
+			} else {
+				memset(&key->tp, 0, sizeof(key->tp));
+			}
+		} else if (key->ip.proto == IPPROTO_ICMP) {
+			if (icmphdr_ok(skb)) {
+				struct icmphdr *icmp = icmp_hdr(skb);
+				/* The ICMP type and code fields use the 16-bit
+				 * transport port fields, so we need to store
+				 * them in 16-bit network byte order. */
+				key->tp.src = htons(icmp->type);
+				key->tp.dst = htons(icmp->code);
+			} else {
+				memset(&key->tp, 0, sizeof(key->tp));
+			}
+		}
+
+	} else if (key->eth.type == htons(ETH_P_ARP) ||
+		   key->eth.type == htons(ETH_P_RARP)) {
+		struct arp_eth_header *arp;
+		bool arp_available = arphdr_ok(skb);
+
+		arp = (struct arp_eth_header *)skb_network_header(skb);
+
+		if (arp_available &&
+		    arp->ar_hrd == htons(ARPHRD_ETHER) &&
+		    arp->ar_pro == htons(ETH_P_IP) &&
+		    arp->ar_hln == ETH_ALEN &&
+		    arp->ar_pln == 4) {
+
+			/* We only match on the lower 8 bits of the opcode. */
+			if (ntohs(arp->ar_op) <= 0xff)
+				key->ip.proto = ntohs(arp->ar_op);
+			else
+				key->ip.proto = 0;
+
+			memcpy(&key->ipv4.addr.src, arp->ar_sip, sizeof(key->ipv4.addr.src));
+			memcpy(&key->ipv4.addr.dst, arp->ar_tip, sizeof(key->ipv4.addr.dst));
+			ether_addr_copy(key->ipv4.arp.sha, arp->ar_sha);
+			ether_addr_copy(key->ipv4.arp.tha, arp->ar_tha);
+		} else {
+			memset(&key->ip, 0, sizeof(key->ip));
+			memset(&key->ipv4, 0, sizeof(key->ipv4));
+		}
+	} else if (eth_p_mpls(key->eth.type)) {
+		size_t stack_len = MPLS_HLEN;
+
+		skb_set_inner_network_header(skb, skb->mac_len);
+		while (1) {
+			__be32 lse;
+
+			error = check_header(skb, skb->mac_len + stack_len);
+			if (unlikely(error))
+				return 0;
+
+			memcpy(&lse, skb_inner_network_header(skb), MPLS_HLEN);
+
+			if (stack_len == MPLS_HLEN)
+				memcpy(&key->mpls.top_lse, &lse, MPLS_HLEN);
+
+			skb_set_inner_network_header(skb, skb->mac_len + stack_len);
+			if (lse & htonl(MPLS_LS_S_MASK))
+				break;
+
+			stack_len += MPLS_HLEN;
+		}
+	} else if (key->eth.type == htons(ETH_P_IPV6)) {
+		int nh_len;             /* IPv6 Header + Extensions */
+
+		nh_len = parse_ipv6hdr(skb, key);
+		if (unlikely(nh_len < 0)) {
+			switch (nh_len) {
+			case -EINVAL:
+				memset(&key->ip, 0, sizeof(key->ip));
+				memset(&key->ipv6.addr, 0, sizeof(key->ipv6.addr));
+				/* fall-through */
+			case -EPROTO:
+				skb->transport_header = skb->network_header;
+				error = 0;
+				break;
+			default:
+				error = nh_len;
+			}
+			return error;
+		}
+
+		if (key->ip.frag == OVS_FRAG_TYPE_LATER)
+			return 0;
+		if (skb_shinfo(skb)->gso_type & SKB_GSO_UDP)
+			key->ip.frag = OVS_FRAG_TYPE_FIRST;
+
+		/* Transport layer. */
+		if (key->ip.proto == NEXTHDR_TCP) {
+			if (tcphdr_ok(skb)) {
+				struct tcphdr *tcp = tcp_hdr(skb);
+				key->tp.src = tcp->source;
+				key->tp.dst = tcp->dest;
+				key->tp.flags = TCP_FLAGS_BE16(tcp);
+			} else {
+				memset(&key->tp, 0, sizeof(key->tp));
+			}
+		} else if (key->ip.proto == NEXTHDR_UDP) {
+			if (udphdr_ok(skb)) {
+				struct udphdr *udp = udp_hdr(skb);
+				key->tp.src = udp->source;
+				key->tp.dst = udp->dest;
+			} else {
+				memset(&key->tp, 0, sizeof(key->tp));
+			}
+		} else if (key->ip.proto == NEXTHDR_SCTP) {
+			if (sctphdr_ok(skb)) {
+				struct sctphdr *sctp = sctp_hdr(skb);
+				key->tp.src = sctp->source;
+				key->tp.dst = sctp->dest;
+			} else {
+				memset(&key->tp, 0, sizeof(key->tp));
+			}
+		} else if (key->ip.proto == NEXTHDR_ICMP) {
+			if (icmp6hdr_ok(skb)) {
+				error = parse_icmpv6(skb, key, nh_len);
+				if (error)
+					return error;
+			} else {
+				memset(&key->tp, 0, sizeof(key->tp));
+			}
+		}
+	} else if (key->eth.type == htons(ETH_P_NSH)) {
+		error = parse_nsh(skb, key);
+		if (error)
+			return error;
+	}
+	return 0;
+}
+
+int ovs_flow_key_update(struct sk_buff *skb, struct sw_flow_key *key)
+{
+	int res;
+
+	res = key_extract(skb, key);
+	if (!res)
+		key->mac_proto &= ~SW_FLOW_KEY_INVALID;
+
+	return res;
+}
+
+static int key_extract_mac_proto(struct sk_buff *skb)
+{
+	switch (skb->dev->type) {
+	case ARPHRD_ETHER:
+		return MAC_PROTO_ETHERNET;
+	case ARPHRD_NONE:
+		if (skb->protocol == htons(ETH_P_TEB))
+			return MAC_PROTO_ETHERNET;
+		return MAC_PROTO_NONE;
+	}
+	WARN_ON_ONCE(1);
+	return -EINVAL;
+}
+
+int ovs_flow_key_extract(const struct ip_tunnel_info *tun_info,
+			 struct sk_buff *skb, struct sw_flow_key *key)
+{
+	int res, err;
+
+	/* Extract metadata from packet. */
+	if (tun_info) {
+		key->tun_proto = ip_tunnel_info_af(tun_info);
+		memcpy(&key->tun_key, &tun_info->key, sizeof(key->tun_key));
+
+		if (tun_info->options_len) {
+			BUILD_BUG_ON((1 << (sizeof(tun_info->options_len) *
+						   8)) - 1
+					> sizeof(key->tun_opts));
+
+			ip_tunnel_info_opts_get(TUN_METADATA_OPTS(key, tun_info->options_len),
+						tun_info);
+			key->tun_opts_len = tun_info->options_len;
+		} else {
+			key->tun_opts_len = 0;
+		}
+	} else  {
+		key->tun_proto = 0;
+		key->tun_opts_len = 0;
+		memset(&key->tun_key, 0, sizeof(key->tun_key));
+	}
+
+	key->phy.priority = skb->priority;
+	key->phy.in_port = OVS_CB(skb)->input_vport->port_no;
+	key->phy.skb_mark = skb->mark;
+	key->ovs_flow_hash = 0;
+	res = key_extract_mac_proto(skb);
+	if (res < 0)
+		return res;
+	key->mac_proto = res;
+	key->recirc_id = 0;
+
+	err = key_extract(skb, key);
+	if (!err)
+		ovs_ct_fill_key(skb, key);   /* Must be after key_extract(). */
+	return err;
+}
+
+int ovs_flow_key_extract_userspace(struct net *net, const struct nlattr *attr,
+				   struct sk_buff *skb,
+				   struct sw_flow_key *key, bool log)
+{
+	const struct nlattr *a[OVS_KEY_ATTR_MAX + 1];
+	u64 attrs = 0;
+	int err;
+
+	err = parse_flow_nlattrs(attr, a, &attrs, log);
+	if (err)
+		return -EINVAL;
+
+	/* Extract metadata from netlink attributes. */
+	err = ovs_nla_get_flow_metadata(net, a, attrs, key, log);
+	if (err)
+		return err;
+
+	/* key_extract assumes that skb->protocol is set-up for
+	 * layer 3 packets which is the case for other callers,
+	 * in particular packets received from the network stack.
+	 * Here the correct value can be set from the metadata
+	 * extracted above.
+	 * For L2 packet key eth type would be zero. skb protocol
+	 * would be set to correct value later during key-extact.
+	 */
+
+	skb->protocol = key->eth.type;
+	err = key_extract(skb, key);
+	if (err)
+		return err;
+
+	/* Check that we have conntrack original direction tuple metadata only
+	 * for packets for which it makes sense.  Otherwise the key may be
+	 * corrupted due to overlapping key fields.
+	 */
+	if (attrs & (1 << OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV4) &&
+	    key->eth.type != htons(ETH_P_IP))
+		return -EINVAL;
+	if (attrs & (1 << OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV6) &&
+	    (key->eth.type != htons(ETH_P_IPV6) ||
+	     sw_flow_key_is_nd(key)))
+		return -EINVAL;
+
+	return 0;
+}
diff --git a/net/openvswitch/flow.h b/net/openvswitch/flow.h
new file mode 100644
index 000000000..c670dd24b
--- /dev/null
+++ b/net/openvswitch/flow.h
@@ -0,0 +1,295 @@
+/*
+ * Copyright (c) 2007-2017 Nicira, Inc.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of version 2 of the GNU General Public
+ * License as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA
+ */
+
+#ifndef FLOW_H
+#define FLOW_H 1
+
+#include <linux/cache.h>
+#include <linux/kernel.h>
+#include <linux/netlink.h>
+#include <linux/openvswitch.h>
+#include <linux/spinlock.h>
+#include <linux/types.h>
+#include <linux/rcupdate.h>
+#include <linux/if_ether.h>
+#include <linux/in6.h>
+#include <linux/jiffies.h>
+#include <linux/time.h>
+#include <linux/flex_array.h>
+#include <linux/cpumask.h>
+#include <net/inet_ecn.h>
+#include <net/ip_tunnels.h>
+#include <net/dst_metadata.h>
+#include <net/nsh.h>
+
+struct sk_buff;
+
+enum sw_flow_mac_proto {
+	MAC_PROTO_NONE = 0,
+	MAC_PROTO_ETHERNET,
+};
+#define SW_FLOW_KEY_INVALID	0x80
+
+/* Store options at the end of the array if they are less than the
+ * maximum size. This allows us to get the benefits of variable length
+ * matching for small options.
+ */
+#define TUN_METADATA_OFFSET(opt_len) \
+	(FIELD_SIZEOF(struct sw_flow_key, tun_opts) - opt_len)
+#define TUN_METADATA_OPTS(flow_key, opt_len) \
+	((void *)((flow_key)->tun_opts + TUN_METADATA_OFFSET(opt_len)))
+
+struct ovs_tunnel_info {
+	struct metadata_dst	*tun_dst;
+};
+
+struct vlan_head {
+	__be16 tpid; /* Vlan type. Generally 802.1q or 802.1ad.*/
+	__be16 tci;  /* 0 if no VLAN, VLAN_TAG_PRESENT set otherwise. */
+};
+
+#define OVS_SW_FLOW_KEY_METADATA_SIZE			\
+	(offsetof(struct sw_flow_key, recirc_id) +	\
+	FIELD_SIZEOF(struct sw_flow_key, recirc_id))
+
+struct ovs_key_nsh {
+	struct ovs_nsh_key_base base;
+	__be32 context[NSH_MD1_CONTEXT_SIZE];
+};
+
+struct sw_flow_key {
+	u8 tun_opts[IP_TUNNEL_OPTS_MAX];
+	u8 tun_opts_len;
+	struct ip_tunnel_key tun_key;	/* Encapsulating tunnel key. */
+	struct {
+		u32	priority;	/* Packet QoS priority. */
+		u32	skb_mark;	/* SKB mark. */
+		u16	in_port;	/* Input switch port (or DP_MAX_PORTS). */
+	} __packed phy; /* Safe when right after 'tun_key'. */
+	u8 mac_proto;			/* MAC layer protocol (e.g. Ethernet). */
+	u8 tun_proto;			/* Protocol of encapsulating tunnel. */
+	u32 ovs_flow_hash;		/* Datapath computed hash value.  */
+	u32 recirc_id;			/* Recirculation ID.  */
+	struct {
+		u8     src[ETH_ALEN];	/* Ethernet source address. */
+		u8     dst[ETH_ALEN];	/* Ethernet destination address. */
+		struct vlan_head vlan;
+		struct vlan_head cvlan;
+		__be16 type;		/* Ethernet frame type. */
+	} eth;
+	/* Filling a hole of two bytes. */
+	u8 ct_state;
+	u8 ct_orig_proto;		/* CT original direction tuple IP
+					 * protocol.
+					 */
+	union {
+		struct {
+			__be32 top_lse;	/* top label stack entry */
+		} mpls;
+		struct {
+			u8     proto;	/* IP protocol or lower 8 bits of ARP opcode. */
+			u8     tos;	    /* IP ToS. */
+			u8     ttl;	    /* IP TTL/hop limit. */
+			u8     frag;	/* One of OVS_FRAG_TYPE_*. */
+		} ip;
+	};
+	u16 ct_zone;			/* Conntrack zone. */
+	struct {
+		__be16 src;		/* TCP/UDP/SCTP source port. */
+		__be16 dst;		/* TCP/UDP/SCTP destination port. */
+		__be16 flags;		/* TCP flags. */
+	} tp;
+	union {
+		struct {
+			struct {
+				__be32 src;	/* IP source address. */
+				__be32 dst;	/* IP destination address. */
+			} addr;
+			union {
+				struct {
+					__be32 src;
+					__be32 dst;
+				} ct_orig;	/* Conntrack original direction fields. */
+				struct {
+					u8 sha[ETH_ALEN];	/* ARP source hardware address. */
+					u8 tha[ETH_ALEN];	/* ARP target hardware address. */
+				} arp;
+			};
+		} ipv4;
+		struct {
+			struct {
+				struct in6_addr src;	/* IPv6 source address. */
+				struct in6_addr dst;	/* IPv6 destination address. */
+			} addr;
+			__be32 label;			/* IPv6 flow label. */
+			union {
+				struct {
+					struct in6_addr src;
+					struct in6_addr dst;
+				} ct_orig;	/* Conntrack original direction fields. */
+				struct {
+					struct in6_addr target;	/* ND target address. */
+					u8 sll[ETH_ALEN];	/* ND source link layer address. */
+					u8 tll[ETH_ALEN];	/* ND target link layer address. */
+				} nd;
+			};
+		} ipv6;
+		struct ovs_key_nsh nsh;         /* network service header */
+	};
+	struct {
+		/* Connection tracking fields not packed above. */
+		struct {
+			__be16 src;	/* CT orig tuple tp src port. */
+			__be16 dst;	/* CT orig tuple tp dst port. */
+		} orig_tp;
+		u32 mark;
+		struct ovs_key_ct_labels labels;
+	} ct;
+
+} __aligned(BITS_PER_LONG/8); /* Ensure that we can do comparisons as longs. */
+
+static inline bool sw_flow_key_is_nd(const struct sw_flow_key *key)
+{
+	return key->eth.type == htons(ETH_P_IPV6) &&
+		key->ip.proto == NEXTHDR_ICMP &&
+		key->tp.dst == 0 &&
+		(key->tp.src == htons(NDISC_NEIGHBOUR_SOLICITATION) ||
+		 key->tp.src == htons(NDISC_NEIGHBOUR_ADVERTISEMENT));
+}
+
+struct sw_flow_key_range {
+	unsigned short int start;
+	unsigned short int end;
+};
+
+struct sw_flow_mask {
+	int ref_count;
+	struct rcu_head rcu;
+	struct list_head list;
+	struct sw_flow_key_range range;
+	struct sw_flow_key key;
+};
+
+struct sw_flow_match {
+	struct sw_flow_key *key;
+	struct sw_flow_key_range range;
+	struct sw_flow_mask *mask;
+};
+
+#define MAX_UFID_LENGTH 16 /* 128 bits */
+
+struct sw_flow_id {
+	u32 ufid_len;
+	union {
+		u32 ufid[MAX_UFID_LENGTH / 4];
+		struct sw_flow_key *unmasked_key;
+	};
+};
+
+struct sw_flow_actions {
+	struct rcu_head rcu;
+	size_t orig_len;	/* From flow_cmd_new netlink actions size */
+	u32 actions_len;
+	struct nlattr actions[];
+};
+
+struct flow_stats {
+	u64 packet_count;		/* Number of packets matched. */
+	u64 byte_count;			/* Number of bytes matched. */
+	unsigned long used;		/* Last used time (in jiffies). */
+	spinlock_t lock;		/* Lock for atomic stats update. */
+	__be16 tcp_flags;		/* Union of seen TCP flags. */
+};
+
+struct sw_flow {
+	struct rcu_head rcu;
+	struct {
+		struct hlist_node node[2];
+		u32 hash;
+	} flow_table, ufid_table;
+	int stats_last_writer;		/* CPU id of the last writer on
+					 * 'stats[0]'.
+					 */
+	struct sw_flow_key key;
+	struct sw_flow_id id;
+	struct cpumask cpu_used_mask;
+	struct sw_flow_mask *mask;
+	struct sw_flow_actions __rcu *sf_acts;
+	struct flow_stats __rcu *stats[]; /* One for each CPU.  First one
+					   * is allocated at flow creation time,
+					   * the rest are allocated on demand
+					   * while holding the 'stats[0].lock'.
+					   */
+};
+
+struct arp_eth_header {
+	__be16      ar_hrd;	/* format of hardware address   */
+	__be16      ar_pro;	/* format of protocol address   */
+	unsigned char   ar_hln;	/* length of hardware address   */
+	unsigned char   ar_pln;	/* length of protocol address   */
+	__be16      ar_op;	/* ARP opcode (command)     */
+
+	/* Ethernet+IPv4 specific members. */
+	unsigned char       ar_sha[ETH_ALEN];	/* sender hardware address  */
+	unsigned char       ar_sip[4];		/* sender IP address        */
+	unsigned char       ar_tha[ETH_ALEN];	/* target hardware address  */
+	unsigned char       ar_tip[4];		/* target IP address        */
+} __packed;
+
+static inline u8 ovs_key_mac_proto(const struct sw_flow_key *key)
+{
+	return key->mac_proto & ~SW_FLOW_KEY_INVALID;
+}
+
+static inline u16 __ovs_mac_header_len(u8 mac_proto)
+{
+	return mac_proto == MAC_PROTO_ETHERNET ? ETH_HLEN : 0;
+}
+
+static inline u16 ovs_mac_header_len(const struct sw_flow_key *key)
+{
+	return __ovs_mac_header_len(ovs_key_mac_proto(key));
+}
+
+static inline bool ovs_identifier_is_ufid(const struct sw_flow_id *sfid)
+{
+	return sfid->ufid_len;
+}
+
+static inline bool ovs_identifier_is_key(const struct sw_flow_id *sfid)
+{
+	return !ovs_identifier_is_ufid(sfid);
+}
+
+void ovs_flow_stats_update(struct sw_flow *, __be16 tcp_flags,
+			   const struct sk_buff *);
+void ovs_flow_stats_get(const struct sw_flow *, struct ovs_flow_stats *,
+			unsigned long *used, __be16 *tcp_flags);
+void ovs_flow_stats_clear(struct sw_flow *);
+u64 ovs_flow_used_time(unsigned long flow_jiffies);
+
+int ovs_flow_key_update(struct sk_buff *skb, struct sw_flow_key *key);
+int ovs_flow_key_extract(const struct ip_tunnel_info *tun_info,
+			 struct sk_buff *skb,
+			 struct sw_flow_key *key);
+/* Extract key from packet coming from userspace. */
+int ovs_flow_key_extract_userspace(struct net *net, const struct nlattr *attr,
+				   struct sk_buff *skb,
+				   struct sw_flow_key *key, bool log);
+
+#endif /* flow.h */
diff --git a/net/openvswitch/flow_netlink.c b/net/openvswitch/flow_netlink.c
new file mode 100644
index 000000000..eba94cf3d
--- /dev/null
+++ b/net/openvswitch/flow_netlink.c
@@ -0,0 +1,3341 @@
+/*
+ * Copyright (c) 2007-2017 Nicira, Inc.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of version 2 of the GNU General Public
+ * License as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include "flow.h"
+#include "datapath.h"
+#include <linux/uaccess.h>
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/if_ether.h>
+#include <linux/if_vlan.h>
+#include <net/llc_pdu.h>
+#include <linux/kernel.h>
+#include <linux/jhash.h>
+#include <linux/jiffies.h>
+#include <linux/llc.h>
+#include <linux/module.h>
+#include <linux/in.h>
+#include <linux/rcupdate.h>
+#include <linux/if_arp.h>
+#include <linux/ip.h>
+#include <linux/ipv6.h>
+#include <linux/sctp.h>
+#include <linux/tcp.h>
+#include <linux/udp.h>
+#include <linux/icmp.h>
+#include <linux/icmpv6.h>
+#include <linux/rculist.h>
+#include <net/geneve.h>
+#include <net/ip.h>
+#include <net/ipv6.h>
+#include <net/ndisc.h>
+#include <net/mpls.h>
+#include <net/vxlan.h>
+#include <net/tun_proto.h>
+#include <net/erspan.h>
+
+#include "flow_netlink.h"
+
+struct ovs_len_tbl {
+	int len;
+	const struct ovs_len_tbl *next;
+};
+
+#define OVS_ATTR_NESTED -1
+#define OVS_ATTR_VARIABLE -2
+
+static bool actions_may_change_flow(const struct nlattr *actions)
+{
+	struct nlattr *nla;
+	int rem;
+
+	nla_for_each_nested(nla, actions, rem) {
+		u16 action = nla_type(nla);
+
+		switch (action) {
+		case OVS_ACTION_ATTR_OUTPUT:
+		case OVS_ACTION_ATTR_RECIRC:
+		case OVS_ACTION_ATTR_TRUNC:
+		case OVS_ACTION_ATTR_USERSPACE:
+			break;
+
+		case OVS_ACTION_ATTR_CT:
+		case OVS_ACTION_ATTR_CT_CLEAR:
+		case OVS_ACTION_ATTR_HASH:
+		case OVS_ACTION_ATTR_POP_ETH:
+		case OVS_ACTION_ATTR_POP_MPLS:
+		case OVS_ACTION_ATTR_POP_NSH:
+		case OVS_ACTION_ATTR_POP_VLAN:
+		case OVS_ACTION_ATTR_PUSH_ETH:
+		case OVS_ACTION_ATTR_PUSH_MPLS:
+		case OVS_ACTION_ATTR_PUSH_NSH:
+		case OVS_ACTION_ATTR_PUSH_VLAN:
+		case OVS_ACTION_ATTR_SAMPLE:
+		case OVS_ACTION_ATTR_SET:
+		case OVS_ACTION_ATTR_SET_MASKED:
+		case OVS_ACTION_ATTR_METER:
+		default:
+			return true;
+		}
+	}
+	return false;
+}
+
+static void update_range(struct sw_flow_match *match,
+			 size_t offset, size_t size, bool is_mask)
+{
+	struct sw_flow_key_range *range;
+	size_t start = rounddown(offset, sizeof(long));
+	size_t end = roundup(offset + size, sizeof(long));
+
+	if (!is_mask)
+		range = &match->range;
+	else
+		range = &match->mask->range;
+
+	if (range->start == range->end) {
+		range->start = start;
+		range->end = end;
+		return;
+	}
+
+	if (range->start > start)
+		range->start = start;
+
+	if (range->end < end)
+		range->end = end;
+}
+
+#define SW_FLOW_KEY_PUT(match, field, value, is_mask) \
+	do { \
+		update_range(match, offsetof(struct sw_flow_key, field),    \
+			     sizeof((match)->key->field), is_mask);	    \
+		if (is_mask)						    \
+			(match)->mask->key.field = value;		    \
+		else							    \
+			(match)->key->field = value;		            \
+	} while (0)
+
+#define SW_FLOW_KEY_MEMCPY_OFFSET(match, offset, value_p, len, is_mask)	    \
+	do {								    \
+		update_range(match, offset, len, is_mask);		    \
+		if (is_mask)						    \
+			memcpy((u8 *)&(match)->mask->key + offset, value_p, \
+			       len);					   \
+		else							    \
+			memcpy((u8 *)(match)->key + offset, value_p, len);  \
+	} while (0)
+
+#define SW_FLOW_KEY_MEMCPY(match, field, value_p, len, is_mask)		      \
+	SW_FLOW_KEY_MEMCPY_OFFSET(match, offsetof(struct sw_flow_key, field), \
+				  value_p, len, is_mask)
+
+#define SW_FLOW_KEY_MEMSET_FIELD(match, field, value, is_mask)		    \
+	do {								    \
+		update_range(match, offsetof(struct sw_flow_key, field),    \
+			     sizeof((match)->key->field), is_mask);	    \
+		if (is_mask)						    \
+			memset((u8 *)&(match)->mask->key.field, value,      \
+			       sizeof((match)->mask->key.field));	    \
+		else							    \
+			memset((u8 *)&(match)->key->field, value,           \
+			       sizeof((match)->key->field));                \
+	} while (0)
+
+static bool match_validate(const struct sw_flow_match *match,
+			   u64 key_attrs, u64 mask_attrs, bool log)
+{
+	u64 key_expected = 0;
+	u64 mask_allowed = key_attrs;  /* At most allow all key attributes */
+
+	/* The following mask attributes allowed only if they
+	 * pass the validation tests. */
+	mask_allowed &= ~((1 << OVS_KEY_ATTR_IPV4)
+			| (1 << OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV4)
+			| (1 << OVS_KEY_ATTR_IPV6)
+			| (1 << OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV6)
+			| (1 << OVS_KEY_ATTR_TCP)
+			| (1 << OVS_KEY_ATTR_TCP_FLAGS)
+			| (1 << OVS_KEY_ATTR_UDP)
+			| (1 << OVS_KEY_ATTR_SCTP)
+			| (1 << OVS_KEY_ATTR_ICMP)
+			| (1 << OVS_KEY_ATTR_ICMPV6)
+			| (1 << OVS_KEY_ATTR_ARP)
+			| (1 << OVS_KEY_ATTR_ND)
+			| (1 << OVS_KEY_ATTR_MPLS)
+			| (1 << OVS_KEY_ATTR_NSH));
+
+	/* Always allowed mask fields. */
+	mask_allowed |= ((1 << OVS_KEY_ATTR_TUNNEL)
+		       | (1 << OVS_KEY_ATTR_IN_PORT)
+		       | (1 << OVS_KEY_ATTR_ETHERTYPE));
+
+	/* Check key attributes. */
+	if (match->key->eth.type == htons(ETH_P_ARP)
+			|| match->key->eth.type == htons(ETH_P_RARP)) {
+		key_expected |= 1 << OVS_KEY_ATTR_ARP;
+		if (match->mask && (match->mask->key.eth.type == htons(0xffff)))
+			mask_allowed |= 1 << OVS_KEY_ATTR_ARP;
+	}
+
+	if (eth_p_mpls(match->key->eth.type)) {
+		key_expected |= 1 << OVS_KEY_ATTR_MPLS;
+		if (match->mask && (match->mask->key.eth.type == htons(0xffff)))
+			mask_allowed |= 1 << OVS_KEY_ATTR_MPLS;
+	}
+
+	if (match->key->eth.type == htons(ETH_P_IP)) {
+		key_expected |= 1 << OVS_KEY_ATTR_IPV4;
+		if (match->mask && match->mask->key.eth.type == htons(0xffff)) {
+			mask_allowed |= 1 << OVS_KEY_ATTR_IPV4;
+			mask_allowed |= 1 << OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV4;
+		}
+
+		if (match->key->ip.frag != OVS_FRAG_TYPE_LATER) {
+			if (match->key->ip.proto == IPPROTO_UDP) {
+				key_expected |= 1 << OVS_KEY_ATTR_UDP;
+				if (match->mask && (match->mask->key.ip.proto == 0xff))
+					mask_allowed |= 1 << OVS_KEY_ATTR_UDP;
+			}
+
+			if (match->key->ip.proto == IPPROTO_SCTP) {
+				key_expected |= 1 << OVS_KEY_ATTR_SCTP;
+				if (match->mask && (match->mask->key.ip.proto == 0xff))
+					mask_allowed |= 1 << OVS_KEY_ATTR_SCTP;
+			}
+
+			if (match->key->ip.proto == IPPROTO_TCP) {
+				key_expected |= 1 << OVS_KEY_ATTR_TCP;
+				key_expected |= 1 << OVS_KEY_ATTR_TCP_FLAGS;
+				if (match->mask && (match->mask->key.ip.proto == 0xff)) {
+					mask_allowed |= 1 << OVS_KEY_ATTR_TCP;
+					mask_allowed |= 1 << OVS_KEY_ATTR_TCP_FLAGS;
+				}
+			}
+
+			if (match->key->ip.proto == IPPROTO_ICMP) {
+				key_expected |= 1 << OVS_KEY_ATTR_ICMP;
+				if (match->mask && (match->mask->key.ip.proto == 0xff))
+					mask_allowed |= 1 << OVS_KEY_ATTR_ICMP;
+			}
+		}
+	}
+
+	if (match->key->eth.type == htons(ETH_P_IPV6)) {
+		key_expected |= 1 << OVS_KEY_ATTR_IPV6;
+		if (match->mask && match->mask->key.eth.type == htons(0xffff)) {
+			mask_allowed |= 1 << OVS_KEY_ATTR_IPV6;
+			mask_allowed |= 1 << OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV6;
+		}
+
+		if (match->key->ip.frag != OVS_FRAG_TYPE_LATER) {
+			if (match->key->ip.proto == IPPROTO_UDP) {
+				key_expected |= 1 << OVS_KEY_ATTR_UDP;
+				if (match->mask && (match->mask->key.ip.proto == 0xff))
+					mask_allowed |= 1 << OVS_KEY_ATTR_UDP;
+			}
+
+			if (match->key->ip.proto == IPPROTO_SCTP) {
+				key_expected |= 1 << OVS_KEY_ATTR_SCTP;
+				if (match->mask && (match->mask->key.ip.proto == 0xff))
+					mask_allowed |= 1 << OVS_KEY_ATTR_SCTP;
+			}
+
+			if (match->key->ip.proto == IPPROTO_TCP) {
+				key_expected |= 1 << OVS_KEY_ATTR_TCP;
+				key_expected |= 1 << OVS_KEY_ATTR_TCP_FLAGS;
+				if (match->mask && (match->mask->key.ip.proto == 0xff)) {
+					mask_allowed |= 1 << OVS_KEY_ATTR_TCP;
+					mask_allowed |= 1 << OVS_KEY_ATTR_TCP_FLAGS;
+				}
+			}
+
+			if (match->key->ip.proto == IPPROTO_ICMPV6) {
+				key_expected |= 1 << OVS_KEY_ATTR_ICMPV6;
+				if (match->mask && (match->mask->key.ip.proto == 0xff))
+					mask_allowed |= 1 << OVS_KEY_ATTR_ICMPV6;
+
+				if (match->key->tp.src ==
+						htons(NDISC_NEIGHBOUR_SOLICITATION) ||
+				    match->key->tp.src == htons(NDISC_NEIGHBOUR_ADVERTISEMENT)) {
+					key_expected |= 1 << OVS_KEY_ATTR_ND;
+					/* Original direction conntrack tuple
+					 * uses the same space as the ND fields
+					 * in the key, so both are not allowed
+					 * at the same time.
+					 */
+					mask_allowed &= ~(1ULL << OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV6);
+					if (match->mask && (match->mask->key.tp.src == htons(0xff)))
+						mask_allowed |= 1 << OVS_KEY_ATTR_ND;
+				}
+			}
+		}
+	}
+
+	if (match->key->eth.type == htons(ETH_P_NSH)) {
+		key_expected |= 1 << OVS_KEY_ATTR_NSH;
+		if (match->mask &&
+		    match->mask->key.eth.type == htons(0xffff)) {
+			mask_allowed |= 1 << OVS_KEY_ATTR_NSH;
+		}
+	}
+
+	if ((key_attrs & key_expected) != key_expected) {
+		/* Key attributes check failed. */
+		OVS_NLERR(log, "Missing key (keys=%llx, expected=%llx)",
+			  (unsigned long long)key_attrs,
+			  (unsigned long long)key_expected);
+		return false;
+	}
+
+	if ((mask_attrs & mask_allowed) != mask_attrs) {
+		/* Mask attributes check failed. */
+		OVS_NLERR(log, "Unexpected mask (mask=%llx, allowed=%llx)",
+			  (unsigned long long)mask_attrs,
+			  (unsigned long long)mask_allowed);
+		return false;
+	}
+
+	return true;
+}
+
+size_t ovs_tun_key_attr_size(void)
+{
+	/* Whenever adding new OVS_TUNNEL_KEY_ FIELDS, we should consider
+	 * updating this function.
+	 */
+	return    nla_total_size_64bit(8) /* OVS_TUNNEL_KEY_ATTR_ID */
+		+ nla_total_size(16)   /* OVS_TUNNEL_KEY_ATTR_IPV[46]_SRC */
+		+ nla_total_size(16)   /* OVS_TUNNEL_KEY_ATTR_IPV[46]_DST */
+		+ nla_total_size(1)    /* OVS_TUNNEL_KEY_ATTR_TOS */
+		+ nla_total_size(1)    /* OVS_TUNNEL_KEY_ATTR_TTL */
+		+ nla_total_size(0)    /* OVS_TUNNEL_KEY_ATTR_DONT_FRAGMENT */
+		+ nla_total_size(0)    /* OVS_TUNNEL_KEY_ATTR_CSUM */
+		+ nla_total_size(0)    /* OVS_TUNNEL_KEY_ATTR_OAM */
+		+ nla_total_size(256)  /* OVS_TUNNEL_KEY_ATTR_GENEVE_OPTS */
+		/* OVS_TUNNEL_KEY_ATTR_VXLAN_OPTS and
+		 * OVS_TUNNEL_KEY_ATTR_ERSPAN_OPTS is mutually exclusive with
+		 * OVS_TUNNEL_KEY_ATTR_GENEVE_OPTS and covered by it.
+		 */
+		+ nla_total_size(2)    /* OVS_TUNNEL_KEY_ATTR_TP_SRC */
+		+ nla_total_size(2);   /* OVS_TUNNEL_KEY_ATTR_TP_DST */
+}
+
+static size_t ovs_nsh_key_attr_size(void)
+{
+	/* Whenever adding new OVS_NSH_KEY_ FIELDS, we should consider
+	 * updating this function.
+	 */
+	return  nla_total_size(NSH_BASE_HDR_LEN) /* OVS_NSH_KEY_ATTR_BASE */
+		/* OVS_NSH_KEY_ATTR_MD1 and OVS_NSH_KEY_ATTR_MD2 are
+		 * mutually exclusive, so the bigger one can cover
+		 * the small one.
+		 */
+		+ nla_total_size(NSH_CTX_HDRS_MAX_LEN);
+}
+
+size_t ovs_key_attr_size(void)
+{
+	/* Whenever adding new OVS_KEY_ FIELDS, we should consider
+	 * updating this function.
+	 */
+	BUILD_BUG_ON(OVS_KEY_ATTR_TUNNEL_INFO != 29);
+
+	return    nla_total_size(4)   /* OVS_KEY_ATTR_PRIORITY */
+		+ nla_total_size(0)   /* OVS_KEY_ATTR_TUNNEL */
+		  + ovs_tun_key_attr_size()
+		+ nla_total_size(4)   /* OVS_KEY_ATTR_IN_PORT */
+		+ nla_total_size(4)   /* OVS_KEY_ATTR_SKB_MARK */
+		+ nla_total_size(4)   /* OVS_KEY_ATTR_DP_HASH */
+		+ nla_total_size(4)   /* OVS_KEY_ATTR_RECIRC_ID */
+		+ nla_total_size(4)   /* OVS_KEY_ATTR_CT_STATE */
+		+ nla_total_size(2)   /* OVS_KEY_ATTR_CT_ZONE */
+		+ nla_total_size(4)   /* OVS_KEY_ATTR_CT_MARK */
+		+ nla_total_size(16)  /* OVS_KEY_ATTR_CT_LABELS */
+		+ nla_total_size(40)  /* OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV6 */
+		+ nla_total_size(0)   /* OVS_KEY_ATTR_NSH */
+		  + ovs_nsh_key_attr_size()
+		+ nla_total_size(12)  /* OVS_KEY_ATTR_ETHERNET */
+		+ nla_total_size(2)   /* OVS_KEY_ATTR_ETHERTYPE */
+		+ nla_total_size(4)   /* OVS_KEY_ATTR_VLAN */
+		+ nla_total_size(0)   /* OVS_KEY_ATTR_ENCAP */
+		+ nla_total_size(2)   /* OVS_KEY_ATTR_ETHERTYPE */
+		+ nla_total_size(40)  /* OVS_KEY_ATTR_IPV6 */
+		+ nla_total_size(2)   /* OVS_KEY_ATTR_ICMPV6 */
+		+ nla_total_size(28); /* OVS_KEY_ATTR_ND */
+}
+
+static const struct ovs_len_tbl ovs_vxlan_ext_key_lens[OVS_VXLAN_EXT_MAX + 1] = {
+	[OVS_VXLAN_EXT_GBP]	    = { .len = sizeof(u32) },
+};
+
+static const struct ovs_len_tbl ovs_tunnel_key_lens[OVS_TUNNEL_KEY_ATTR_MAX + 1] = {
+	[OVS_TUNNEL_KEY_ATTR_ID]	    = { .len = sizeof(u64) },
+	[OVS_TUNNEL_KEY_ATTR_IPV4_SRC]	    = { .len = sizeof(u32) },
+	[OVS_TUNNEL_KEY_ATTR_IPV4_DST]	    = { .len = sizeof(u32) },
+	[OVS_TUNNEL_KEY_ATTR_TOS]	    = { .len = 1 },
+	[OVS_TUNNEL_KEY_ATTR_TTL]	    = { .len = 1 },
+	[OVS_TUNNEL_KEY_ATTR_DONT_FRAGMENT] = { .len = 0 },
+	[OVS_TUNNEL_KEY_ATTR_CSUM]	    = { .len = 0 },
+	[OVS_TUNNEL_KEY_ATTR_TP_SRC]	    = { .len = sizeof(u16) },
+	[OVS_TUNNEL_KEY_ATTR_TP_DST]	    = { .len = sizeof(u16) },
+	[OVS_TUNNEL_KEY_ATTR_OAM]	    = { .len = 0 },
+	[OVS_TUNNEL_KEY_ATTR_GENEVE_OPTS]   = { .len = OVS_ATTR_VARIABLE },
+	[OVS_TUNNEL_KEY_ATTR_VXLAN_OPTS]    = { .len = OVS_ATTR_NESTED,
+						.next = ovs_vxlan_ext_key_lens },
+	[OVS_TUNNEL_KEY_ATTR_IPV6_SRC]      = { .len = sizeof(struct in6_addr) },
+	[OVS_TUNNEL_KEY_ATTR_IPV6_DST]      = { .len = sizeof(struct in6_addr) },
+	[OVS_TUNNEL_KEY_ATTR_ERSPAN_OPTS]   = { .len = OVS_ATTR_VARIABLE },
+};
+
+static const struct ovs_len_tbl
+ovs_nsh_key_attr_lens[OVS_NSH_KEY_ATTR_MAX + 1] = {
+	[OVS_NSH_KEY_ATTR_BASE] = { .len = sizeof(struct ovs_nsh_key_base) },
+	[OVS_NSH_KEY_ATTR_MD1]  = { .len = sizeof(struct ovs_nsh_key_md1) },
+	[OVS_NSH_KEY_ATTR_MD2]  = { .len = OVS_ATTR_VARIABLE },
+};
+
+/* The size of the argument for each %OVS_KEY_ATTR_* Netlink attribute.  */
+static const struct ovs_len_tbl ovs_key_lens[OVS_KEY_ATTR_MAX + 1] = {
+	[OVS_KEY_ATTR_ENCAP]	 = { .len = OVS_ATTR_NESTED },
+	[OVS_KEY_ATTR_PRIORITY]	 = { .len = sizeof(u32) },
+	[OVS_KEY_ATTR_IN_PORT]	 = { .len = sizeof(u32) },
+	[OVS_KEY_ATTR_SKB_MARK]	 = { .len = sizeof(u32) },
+	[OVS_KEY_ATTR_ETHERNET]	 = { .len = sizeof(struct ovs_key_ethernet) },
+	[OVS_KEY_ATTR_VLAN]	 = { .len = sizeof(__be16) },
+	[OVS_KEY_ATTR_ETHERTYPE] = { .len = sizeof(__be16) },
+	[OVS_KEY_ATTR_IPV4]	 = { .len = sizeof(struct ovs_key_ipv4) },
+	[OVS_KEY_ATTR_IPV6]	 = { .len = sizeof(struct ovs_key_ipv6) },
+	[OVS_KEY_ATTR_TCP]	 = { .len = sizeof(struct ovs_key_tcp) },
+	[OVS_KEY_ATTR_TCP_FLAGS] = { .len = sizeof(__be16) },
+	[OVS_KEY_ATTR_UDP]	 = { .len = sizeof(struct ovs_key_udp) },
+	[OVS_KEY_ATTR_SCTP]	 = { .len = sizeof(struct ovs_key_sctp) },
+	[OVS_KEY_ATTR_ICMP]	 = { .len = sizeof(struct ovs_key_icmp) },
+	[OVS_KEY_ATTR_ICMPV6]	 = { .len = sizeof(struct ovs_key_icmpv6) },
+	[OVS_KEY_ATTR_ARP]	 = { .len = sizeof(struct ovs_key_arp) },
+	[OVS_KEY_ATTR_ND]	 = { .len = sizeof(struct ovs_key_nd) },
+	[OVS_KEY_ATTR_RECIRC_ID] = { .len = sizeof(u32) },
+	[OVS_KEY_ATTR_DP_HASH]	 = { .len = sizeof(u32) },
+	[OVS_KEY_ATTR_TUNNEL]	 = { .len = OVS_ATTR_NESTED,
+				     .next = ovs_tunnel_key_lens, },
+	[OVS_KEY_ATTR_MPLS]	 = { .len = sizeof(struct ovs_key_mpls) },
+	[OVS_KEY_ATTR_CT_STATE]	 = { .len = sizeof(u32) },
+	[OVS_KEY_ATTR_CT_ZONE]	 = { .len = sizeof(u16) },
+	[OVS_KEY_ATTR_CT_MARK]	 = { .len = sizeof(u32) },
+	[OVS_KEY_ATTR_CT_LABELS] = { .len = sizeof(struct ovs_key_ct_labels) },
+	[OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV4] = {
+		.len = sizeof(struct ovs_key_ct_tuple_ipv4) },
+	[OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV6] = {
+		.len = sizeof(struct ovs_key_ct_tuple_ipv6) },
+	[OVS_KEY_ATTR_NSH]       = { .len = OVS_ATTR_NESTED,
+				     .next = ovs_nsh_key_attr_lens, },
+};
+
+static bool check_attr_len(unsigned int attr_len, unsigned int expected_len)
+{
+	return expected_len == attr_len ||
+	       expected_len == OVS_ATTR_NESTED ||
+	       expected_len == OVS_ATTR_VARIABLE;
+}
+
+static bool is_all_zero(const u8 *fp, size_t size)
+{
+	int i;
+
+	if (!fp)
+		return false;
+
+	for (i = 0; i < size; i++)
+		if (fp[i])
+			return false;
+
+	return true;
+}
+
+static int __parse_flow_nlattrs(const struct nlattr *attr,
+				const struct nlattr *a[],
+				u64 *attrsp, bool log, bool nz)
+{
+	const struct nlattr *nla;
+	u64 attrs;
+	int rem;
+
+	attrs = *attrsp;
+	nla_for_each_nested(nla, attr, rem) {
+		u16 type = nla_type(nla);
+		int expected_len;
+
+		if (type > OVS_KEY_ATTR_MAX) {
+			OVS_NLERR(log, "Key type %d is out of range max %d",
+				  type, OVS_KEY_ATTR_MAX);
+			return -EINVAL;
+		}
+
+		if (attrs & (1 << type)) {
+			OVS_NLERR(log, "Duplicate key (type %d).", type);
+			return -EINVAL;
+		}
+
+		expected_len = ovs_key_lens[type].len;
+		if (!check_attr_len(nla_len(nla), expected_len)) {
+			OVS_NLERR(log, "Key %d has unexpected len %d expected %d",
+				  type, nla_len(nla), expected_len);
+			return -EINVAL;
+		}
+
+		if (!nz || !is_all_zero(nla_data(nla), nla_len(nla))) {
+			attrs |= 1 << type;
+			a[type] = nla;
+		}
+	}
+	if (rem) {
+		OVS_NLERR(log, "Message has %d unknown bytes.", rem);
+		return -EINVAL;
+	}
+
+	*attrsp = attrs;
+	return 0;
+}
+
+static int parse_flow_mask_nlattrs(const struct nlattr *attr,
+				   const struct nlattr *a[], u64 *attrsp,
+				   bool log)
+{
+	return __parse_flow_nlattrs(attr, a, attrsp, log, true);
+}
+
+int parse_flow_nlattrs(const struct nlattr *attr, const struct nlattr *a[],
+		       u64 *attrsp, bool log)
+{
+	return __parse_flow_nlattrs(attr, a, attrsp, log, false);
+}
+
+static int genev_tun_opt_from_nlattr(const struct nlattr *a,
+				     struct sw_flow_match *match, bool is_mask,
+				     bool log)
+{
+	unsigned long opt_key_offset;
+
+	if (nla_len(a) > sizeof(match->key->tun_opts)) {
+		OVS_NLERR(log, "Geneve option length err (len %d, max %zu).",
+			  nla_len(a), sizeof(match->key->tun_opts));
+		return -EINVAL;
+	}
+
+	if (nla_len(a) % 4 != 0) {
+		OVS_NLERR(log, "Geneve opt len %d is not a multiple of 4.",
+			  nla_len(a));
+		return -EINVAL;
+	}
+
+	/* We need to record the length of the options passed
+	 * down, otherwise packets with the same format but
+	 * additional options will be silently matched.
+	 */
+	if (!is_mask) {
+		SW_FLOW_KEY_PUT(match, tun_opts_len, nla_len(a),
+				false);
+	} else {
+		/* This is somewhat unusual because it looks at
+		 * both the key and mask while parsing the
+		 * attributes (and by extension assumes the key
+		 * is parsed first). Normally, we would verify
+		 * that each is the correct length and that the
+		 * attributes line up in the validate function.
+		 * However, that is difficult because this is
+		 * variable length and we won't have the
+		 * information later.
+		 */
+		if (match->key->tun_opts_len != nla_len(a)) {
+			OVS_NLERR(log, "Geneve option len %d != mask len %d",
+				  match->key->tun_opts_len, nla_len(a));
+			return -EINVAL;
+		}
+
+		SW_FLOW_KEY_PUT(match, tun_opts_len, 0xff, true);
+	}
+
+	opt_key_offset = TUN_METADATA_OFFSET(nla_len(a));
+	SW_FLOW_KEY_MEMCPY_OFFSET(match, opt_key_offset, nla_data(a),
+				  nla_len(a), is_mask);
+	return 0;
+}
+
+static int vxlan_tun_opt_from_nlattr(const struct nlattr *attr,
+				     struct sw_flow_match *match, bool is_mask,
+				     bool log)
+{
+	struct nlattr *a;
+	int rem;
+	unsigned long opt_key_offset;
+	struct vxlan_metadata opts;
+
+	BUILD_BUG_ON(sizeof(opts) > sizeof(match->key->tun_opts));
+
+	memset(&opts, 0, sizeof(opts));
+	nla_for_each_nested(a, attr, rem) {
+		int type = nla_type(a);
+
+		if (type > OVS_VXLAN_EXT_MAX) {
+			OVS_NLERR(log, "VXLAN extension %d out of range max %d",
+				  type, OVS_VXLAN_EXT_MAX);
+			return -EINVAL;
+		}
+
+		if (!check_attr_len(nla_len(a),
+				    ovs_vxlan_ext_key_lens[type].len)) {
+			OVS_NLERR(log, "VXLAN extension %d has unexpected len %d expected %d",
+				  type, nla_len(a),
+				  ovs_vxlan_ext_key_lens[type].len);
+			return -EINVAL;
+		}
+
+		switch (type) {
+		case OVS_VXLAN_EXT_GBP:
+			opts.gbp = nla_get_u32(a);
+			break;
+		default:
+			OVS_NLERR(log, "Unknown VXLAN extension attribute %d",
+				  type);
+			return -EINVAL;
+		}
+	}
+	if (rem) {
+		OVS_NLERR(log, "VXLAN extension message has %d unknown bytes.",
+			  rem);
+		return -EINVAL;
+	}
+
+	if (!is_mask)
+		SW_FLOW_KEY_PUT(match, tun_opts_len, sizeof(opts), false);
+	else
+		SW_FLOW_KEY_PUT(match, tun_opts_len, 0xff, true);
+
+	opt_key_offset = TUN_METADATA_OFFSET(sizeof(opts));
+	SW_FLOW_KEY_MEMCPY_OFFSET(match, opt_key_offset, &opts, sizeof(opts),
+				  is_mask);
+	return 0;
+}
+
+static int erspan_tun_opt_from_nlattr(const struct nlattr *a,
+				      struct sw_flow_match *match, bool is_mask,
+				      bool log)
+{
+	unsigned long opt_key_offset;
+
+	BUILD_BUG_ON(sizeof(struct erspan_metadata) >
+		     sizeof(match->key->tun_opts));
+
+	if (nla_len(a) > sizeof(match->key->tun_opts)) {
+		OVS_NLERR(log, "ERSPAN option length err (len %d, max %zu).",
+			  nla_len(a), sizeof(match->key->tun_opts));
+		return -EINVAL;
+	}
+
+	if (!is_mask)
+		SW_FLOW_KEY_PUT(match, tun_opts_len,
+				sizeof(struct erspan_metadata), false);
+	else
+		SW_FLOW_KEY_PUT(match, tun_opts_len, 0xff, true);
+
+	opt_key_offset = TUN_METADATA_OFFSET(nla_len(a));
+	SW_FLOW_KEY_MEMCPY_OFFSET(match, opt_key_offset, nla_data(a),
+				  nla_len(a), is_mask);
+	return 0;
+}
+
+static int ip_tun_from_nlattr(const struct nlattr *attr,
+			      struct sw_flow_match *match, bool is_mask,
+			      bool log)
+{
+	bool ttl = false, ipv4 = false, ipv6 = false;
+	__be16 tun_flags = 0;
+	int opts_type = 0;
+	struct nlattr *a;
+	int rem;
+
+	nla_for_each_nested(a, attr, rem) {
+		int type = nla_type(a);
+		int err;
+
+		if (type > OVS_TUNNEL_KEY_ATTR_MAX) {
+			OVS_NLERR(log, "Tunnel attr %d out of range max %d",
+				  type, OVS_TUNNEL_KEY_ATTR_MAX);
+			return -EINVAL;
+		}
+
+		if (!check_attr_len(nla_len(a),
+				    ovs_tunnel_key_lens[type].len)) {
+			OVS_NLERR(log, "Tunnel attr %d has unexpected len %d expected %d",
+				  type, nla_len(a), ovs_tunnel_key_lens[type].len);
+			return -EINVAL;
+		}
+
+		switch (type) {
+		case OVS_TUNNEL_KEY_ATTR_ID:
+			SW_FLOW_KEY_PUT(match, tun_key.tun_id,
+					nla_get_be64(a), is_mask);
+			tun_flags |= TUNNEL_KEY;
+			break;
+		case OVS_TUNNEL_KEY_ATTR_IPV4_SRC:
+			SW_FLOW_KEY_PUT(match, tun_key.u.ipv4.src,
+					nla_get_in_addr(a), is_mask);
+			ipv4 = true;
+			break;
+		case OVS_TUNNEL_KEY_ATTR_IPV4_DST:
+			SW_FLOW_KEY_PUT(match, tun_key.u.ipv4.dst,
+					nla_get_in_addr(a), is_mask);
+			ipv4 = true;
+			break;
+		case OVS_TUNNEL_KEY_ATTR_IPV6_SRC:
+			SW_FLOW_KEY_PUT(match, tun_key.u.ipv6.src,
+					nla_get_in6_addr(a), is_mask);
+			ipv6 = true;
+			break;
+		case OVS_TUNNEL_KEY_ATTR_IPV6_DST:
+			SW_FLOW_KEY_PUT(match, tun_key.u.ipv6.dst,
+					nla_get_in6_addr(a), is_mask);
+			ipv6 = true;
+			break;
+		case OVS_TUNNEL_KEY_ATTR_TOS:
+			SW_FLOW_KEY_PUT(match, tun_key.tos,
+					nla_get_u8(a), is_mask);
+			break;
+		case OVS_TUNNEL_KEY_ATTR_TTL:
+			SW_FLOW_KEY_PUT(match, tun_key.ttl,
+					nla_get_u8(a), is_mask);
+			ttl = true;
+			break;
+		case OVS_TUNNEL_KEY_ATTR_DONT_FRAGMENT:
+			tun_flags |= TUNNEL_DONT_FRAGMENT;
+			break;
+		case OVS_TUNNEL_KEY_ATTR_CSUM:
+			tun_flags |= TUNNEL_CSUM;
+			break;
+		case OVS_TUNNEL_KEY_ATTR_TP_SRC:
+			SW_FLOW_KEY_PUT(match, tun_key.tp_src,
+					nla_get_be16(a), is_mask);
+			break;
+		case OVS_TUNNEL_KEY_ATTR_TP_DST:
+			SW_FLOW_KEY_PUT(match, tun_key.tp_dst,
+					nla_get_be16(a), is_mask);
+			break;
+		case OVS_TUNNEL_KEY_ATTR_OAM:
+			tun_flags |= TUNNEL_OAM;
+			break;
+		case OVS_TUNNEL_KEY_ATTR_GENEVE_OPTS:
+			if (opts_type) {
+				OVS_NLERR(log, "Multiple metadata blocks provided");
+				return -EINVAL;
+			}
+
+			err = genev_tun_opt_from_nlattr(a, match, is_mask, log);
+			if (err)
+				return err;
+
+			tun_flags |= TUNNEL_GENEVE_OPT;
+			opts_type = type;
+			break;
+		case OVS_TUNNEL_KEY_ATTR_VXLAN_OPTS:
+			if (opts_type) {
+				OVS_NLERR(log, "Multiple metadata blocks provided");
+				return -EINVAL;
+			}
+
+			err = vxlan_tun_opt_from_nlattr(a, match, is_mask, log);
+			if (err)
+				return err;
+
+			tun_flags |= TUNNEL_VXLAN_OPT;
+			opts_type = type;
+			break;
+		case OVS_TUNNEL_KEY_ATTR_PAD:
+			break;
+		case OVS_TUNNEL_KEY_ATTR_ERSPAN_OPTS:
+			if (opts_type) {
+				OVS_NLERR(log, "Multiple metadata blocks provided");
+				return -EINVAL;
+			}
+
+			err = erspan_tun_opt_from_nlattr(a, match, is_mask,
+							 log);
+			if (err)
+				return err;
+
+			tun_flags |= TUNNEL_ERSPAN_OPT;
+			opts_type = type;
+			break;
+		default:
+			OVS_NLERR(log, "Unknown IP tunnel attribute %d",
+				  type);
+			return -EINVAL;
+		}
+	}
+
+	SW_FLOW_KEY_PUT(match, tun_key.tun_flags, tun_flags, is_mask);
+	if (is_mask)
+		SW_FLOW_KEY_MEMSET_FIELD(match, tun_proto, 0xff, true);
+	else
+		SW_FLOW_KEY_PUT(match, tun_proto, ipv6 ? AF_INET6 : AF_INET,
+				false);
+
+	if (rem > 0) {
+		OVS_NLERR(log, "IP tunnel attribute has %d unknown bytes.",
+			  rem);
+		return -EINVAL;
+	}
+
+	if (ipv4 && ipv6) {
+		OVS_NLERR(log, "Mixed IPv4 and IPv6 tunnel attributes");
+		return -EINVAL;
+	}
+
+	if (!is_mask) {
+		if (!ipv4 && !ipv6) {
+			OVS_NLERR(log, "IP tunnel dst address not specified");
+			return -EINVAL;
+		}
+		if (ipv4 && !match->key->tun_key.u.ipv4.dst) {
+			OVS_NLERR(log, "IPv4 tunnel dst address is zero");
+			return -EINVAL;
+		}
+		if (ipv6 && ipv6_addr_any(&match->key->tun_key.u.ipv6.dst)) {
+			OVS_NLERR(log, "IPv6 tunnel dst address is zero");
+			return -EINVAL;
+		}
+
+		if (!ttl) {
+			OVS_NLERR(log, "IP tunnel TTL not specified.");
+			return -EINVAL;
+		}
+	}
+
+	return opts_type;
+}
+
+static int vxlan_opt_to_nlattr(struct sk_buff *skb,
+			       const void *tun_opts, int swkey_tun_opts_len)
+{
+	const struct vxlan_metadata *opts = tun_opts;
+	struct nlattr *nla;
+
+	nla = nla_nest_start(skb, OVS_TUNNEL_KEY_ATTR_VXLAN_OPTS);
+	if (!nla)
+		return -EMSGSIZE;
+
+	if (nla_put_u32(skb, OVS_VXLAN_EXT_GBP, opts->gbp) < 0)
+		return -EMSGSIZE;
+
+	nla_nest_end(skb, nla);
+	return 0;
+}
+
+static int __ip_tun_to_nlattr(struct sk_buff *skb,
+			      const struct ip_tunnel_key *output,
+			      const void *tun_opts, int swkey_tun_opts_len,
+			      unsigned short tun_proto)
+{
+	if (output->tun_flags & TUNNEL_KEY &&
+	    nla_put_be64(skb, OVS_TUNNEL_KEY_ATTR_ID, output->tun_id,
+			 OVS_TUNNEL_KEY_ATTR_PAD))
+		return -EMSGSIZE;
+	switch (tun_proto) {
+	case AF_INET:
+		if (output->u.ipv4.src &&
+		    nla_put_in_addr(skb, OVS_TUNNEL_KEY_ATTR_IPV4_SRC,
+				    output->u.ipv4.src))
+			return -EMSGSIZE;
+		if (output->u.ipv4.dst &&
+		    nla_put_in_addr(skb, OVS_TUNNEL_KEY_ATTR_IPV4_DST,
+				    output->u.ipv4.dst))
+			return -EMSGSIZE;
+		break;
+	case AF_INET6:
+		if (!ipv6_addr_any(&output->u.ipv6.src) &&
+		    nla_put_in6_addr(skb, OVS_TUNNEL_KEY_ATTR_IPV6_SRC,
+				     &output->u.ipv6.src))
+			return -EMSGSIZE;
+		if (!ipv6_addr_any(&output->u.ipv6.dst) &&
+		    nla_put_in6_addr(skb, OVS_TUNNEL_KEY_ATTR_IPV6_DST,
+				     &output->u.ipv6.dst))
+			return -EMSGSIZE;
+		break;
+	}
+	if (output->tos &&
+	    nla_put_u8(skb, OVS_TUNNEL_KEY_ATTR_TOS, output->tos))
+		return -EMSGSIZE;
+	if (nla_put_u8(skb, OVS_TUNNEL_KEY_ATTR_TTL, output->ttl))
+		return -EMSGSIZE;
+	if ((output->tun_flags & TUNNEL_DONT_FRAGMENT) &&
+	    nla_put_flag(skb, OVS_TUNNEL_KEY_ATTR_DONT_FRAGMENT))
+		return -EMSGSIZE;
+	if ((output->tun_flags & TUNNEL_CSUM) &&
+	    nla_put_flag(skb, OVS_TUNNEL_KEY_ATTR_CSUM))
+		return -EMSGSIZE;
+	if (output->tp_src &&
+	    nla_put_be16(skb, OVS_TUNNEL_KEY_ATTR_TP_SRC, output->tp_src))
+		return -EMSGSIZE;
+	if (output->tp_dst &&
+	    nla_put_be16(skb, OVS_TUNNEL_KEY_ATTR_TP_DST, output->tp_dst))
+		return -EMSGSIZE;
+	if ((output->tun_flags & TUNNEL_OAM) &&
+	    nla_put_flag(skb, OVS_TUNNEL_KEY_ATTR_OAM))
+		return -EMSGSIZE;
+	if (swkey_tun_opts_len) {
+		if (output->tun_flags & TUNNEL_GENEVE_OPT &&
+		    nla_put(skb, OVS_TUNNEL_KEY_ATTR_GENEVE_OPTS,
+			    swkey_tun_opts_len, tun_opts))
+			return -EMSGSIZE;
+		else if (output->tun_flags & TUNNEL_VXLAN_OPT &&
+			 vxlan_opt_to_nlattr(skb, tun_opts, swkey_tun_opts_len))
+			return -EMSGSIZE;
+		else if (output->tun_flags & TUNNEL_ERSPAN_OPT &&
+			 nla_put(skb, OVS_TUNNEL_KEY_ATTR_ERSPAN_OPTS,
+				 swkey_tun_opts_len, tun_opts))
+			return -EMSGSIZE;
+	}
+
+	return 0;
+}
+
+static int ip_tun_to_nlattr(struct sk_buff *skb,
+			    const struct ip_tunnel_key *output,
+			    const void *tun_opts, int swkey_tun_opts_len,
+			    unsigned short tun_proto)
+{
+	struct nlattr *nla;
+	int err;
+
+	nla = nla_nest_start(skb, OVS_KEY_ATTR_TUNNEL);
+	if (!nla)
+		return -EMSGSIZE;
+
+	err = __ip_tun_to_nlattr(skb, output, tun_opts, swkey_tun_opts_len,
+				 tun_proto);
+	if (err)
+		return err;
+
+	nla_nest_end(skb, nla);
+	return 0;
+}
+
+int ovs_nla_put_tunnel_info(struct sk_buff *skb,
+			    struct ip_tunnel_info *tun_info)
+{
+	return __ip_tun_to_nlattr(skb, &tun_info->key,
+				  ip_tunnel_info_opts(tun_info),
+				  tun_info->options_len,
+				  ip_tunnel_info_af(tun_info));
+}
+
+static int encode_vlan_from_nlattrs(struct sw_flow_match *match,
+				    const struct nlattr *a[],
+				    bool is_mask, bool inner)
+{
+	__be16 tci = 0;
+	__be16 tpid = 0;
+
+	if (a[OVS_KEY_ATTR_VLAN])
+		tci = nla_get_be16(a[OVS_KEY_ATTR_VLAN]);
+
+	if (a[OVS_KEY_ATTR_ETHERTYPE])
+		tpid = nla_get_be16(a[OVS_KEY_ATTR_ETHERTYPE]);
+
+	if (likely(!inner)) {
+		SW_FLOW_KEY_PUT(match, eth.vlan.tpid, tpid, is_mask);
+		SW_FLOW_KEY_PUT(match, eth.vlan.tci, tci, is_mask);
+	} else {
+		SW_FLOW_KEY_PUT(match, eth.cvlan.tpid, tpid, is_mask);
+		SW_FLOW_KEY_PUT(match, eth.cvlan.tci, tci, is_mask);
+	}
+	return 0;
+}
+
+static int validate_vlan_from_nlattrs(const struct sw_flow_match *match,
+				      u64 key_attrs, bool inner,
+				      const struct nlattr **a, bool log)
+{
+	__be16 tci = 0;
+
+	if (!((key_attrs & (1 << OVS_KEY_ATTR_ETHERNET)) &&
+	      (key_attrs & (1 << OVS_KEY_ATTR_ETHERTYPE)) &&
+	       eth_type_vlan(nla_get_be16(a[OVS_KEY_ATTR_ETHERTYPE])))) {
+		/* Not a VLAN. */
+		return 0;
+	}
+
+	if (!((key_attrs & (1 << OVS_KEY_ATTR_VLAN)) &&
+	      (key_attrs & (1 << OVS_KEY_ATTR_ENCAP)))) {
+		OVS_NLERR(log, "Invalid %s frame", (inner) ? "C-VLAN" : "VLAN");
+		return -EINVAL;
+	}
+
+	if (a[OVS_KEY_ATTR_VLAN])
+		tci = nla_get_be16(a[OVS_KEY_ATTR_VLAN]);
+
+	if (!(tci & htons(VLAN_TAG_PRESENT))) {
+		if (tci) {
+			OVS_NLERR(log, "%s TCI does not have VLAN_TAG_PRESENT bit set.",
+				  (inner) ? "C-VLAN" : "VLAN");
+			return -EINVAL;
+		} else if (nla_len(a[OVS_KEY_ATTR_ENCAP])) {
+			/* Corner case for truncated VLAN header. */
+			OVS_NLERR(log, "Truncated %s header has non-zero encap attribute.",
+				  (inner) ? "C-VLAN" : "VLAN");
+			return -EINVAL;
+		}
+	}
+
+	return 1;
+}
+
+static int validate_vlan_mask_from_nlattrs(const struct sw_flow_match *match,
+					   u64 key_attrs, bool inner,
+					   const struct nlattr **a, bool log)
+{
+	__be16 tci = 0;
+	__be16 tpid = 0;
+	bool encap_valid = !!(match->key->eth.vlan.tci &
+			      htons(VLAN_TAG_PRESENT));
+	bool i_encap_valid = !!(match->key->eth.cvlan.tci &
+				htons(VLAN_TAG_PRESENT));
+
+	if (!(key_attrs & (1 << OVS_KEY_ATTR_ENCAP))) {
+		/* Not a VLAN. */
+		return 0;
+	}
+
+	if ((!inner && !encap_valid) || (inner && !i_encap_valid)) {
+		OVS_NLERR(log, "Encap mask attribute is set for non-%s frame.",
+			  (inner) ? "C-VLAN" : "VLAN");
+		return -EINVAL;
+	}
+
+	if (a[OVS_KEY_ATTR_VLAN])
+		tci = nla_get_be16(a[OVS_KEY_ATTR_VLAN]);
+
+	if (a[OVS_KEY_ATTR_ETHERTYPE])
+		tpid = nla_get_be16(a[OVS_KEY_ATTR_ETHERTYPE]);
+
+	if (tpid != htons(0xffff)) {
+		OVS_NLERR(log, "Must have an exact match on %s TPID (mask=%x).",
+			  (inner) ? "C-VLAN" : "VLAN", ntohs(tpid));
+		return -EINVAL;
+	}
+	if (!(tci & htons(VLAN_TAG_PRESENT))) {
+		OVS_NLERR(log, "%s TCI mask does not have exact match for VLAN_TAG_PRESENT bit.",
+			  (inner) ? "C-VLAN" : "VLAN");
+		return -EINVAL;
+	}
+
+	return 1;
+}
+
+static int __parse_vlan_from_nlattrs(struct sw_flow_match *match,
+				     u64 *key_attrs, bool inner,
+				     const struct nlattr **a, bool is_mask,
+				     bool log)
+{
+	int err;
+	const struct nlattr *encap;
+
+	if (!is_mask)
+		err = validate_vlan_from_nlattrs(match, *key_attrs, inner,
+						 a, log);
+	else
+		err = validate_vlan_mask_from_nlattrs(match, *key_attrs, inner,
+						      a, log);
+	if (err <= 0)
+		return err;
+
+	err = encode_vlan_from_nlattrs(match, a, is_mask, inner);
+	if (err)
+		return err;
+
+	*key_attrs &= ~(1 << OVS_KEY_ATTR_ENCAP);
+	*key_attrs &= ~(1 << OVS_KEY_ATTR_VLAN);
+	*key_attrs &= ~(1 << OVS_KEY_ATTR_ETHERTYPE);
+
+	encap = a[OVS_KEY_ATTR_ENCAP];
+
+	if (!is_mask)
+		err = parse_flow_nlattrs(encap, a, key_attrs, log);
+	else
+		err = parse_flow_mask_nlattrs(encap, a, key_attrs, log);
+
+	return err;
+}
+
+static int parse_vlan_from_nlattrs(struct sw_flow_match *match,
+				   u64 *key_attrs, const struct nlattr **a,
+				   bool is_mask, bool log)
+{
+	int err;
+	bool encap_valid = false;
+
+	err = __parse_vlan_from_nlattrs(match, key_attrs, false, a,
+					is_mask, log);
+	if (err)
+		return err;
+
+	encap_valid = !!(match->key->eth.vlan.tci & htons(VLAN_TAG_PRESENT));
+	if (encap_valid) {
+		err = __parse_vlan_from_nlattrs(match, key_attrs, true, a,
+						is_mask, log);
+		if (err)
+			return err;
+	}
+
+	return 0;
+}
+
+static int parse_eth_type_from_nlattrs(struct sw_flow_match *match,
+				       u64 *attrs, const struct nlattr **a,
+				       bool is_mask, bool log)
+{
+	__be16 eth_type;
+
+	eth_type = nla_get_be16(a[OVS_KEY_ATTR_ETHERTYPE]);
+	if (is_mask) {
+		/* Always exact match EtherType. */
+		eth_type = htons(0xffff);
+	} else if (!eth_proto_is_802_3(eth_type)) {
+		OVS_NLERR(log, "EtherType %x is less than min %x",
+				ntohs(eth_type), ETH_P_802_3_MIN);
+		return -EINVAL;
+	}
+
+	SW_FLOW_KEY_PUT(match, eth.type, eth_type, is_mask);
+	*attrs &= ~(1 << OVS_KEY_ATTR_ETHERTYPE);
+	return 0;
+}
+
+static int metadata_from_nlattrs(struct net *net, struct sw_flow_match *match,
+				 u64 *attrs, const struct nlattr **a,
+				 bool is_mask, bool log)
+{
+	u8 mac_proto = MAC_PROTO_ETHERNET;
+
+	if (*attrs & (1 << OVS_KEY_ATTR_DP_HASH)) {
+		u32 hash_val = nla_get_u32(a[OVS_KEY_ATTR_DP_HASH]);
+
+		SW_FLOW_KEY_PUT(match, ovs_flow_hash, hash_val, is_mask);
+		*attrs &= ~(1 << OVS_KEY_ATTR_DP_HASH);
+	}
+
+	if (*attrs & (1 << OVS_KEY_ATTR_RECIRC_ID)) {
+		u32 recirc_id = nla_get_u32(a[OVS_KEY_ATTR_RECIRC_ID]);
+
+		SW_FLOW_KEY_PUT(match, recirc_id, recirc_id, is_mask);
+		*attrs &= ~(1 << OVS_KEY_ATTR_RECIRC_ID);
+	}
+
+	if (*attrs & (1 << OVS_KEY_ATTR_PRIORITY)) {
+		SW_FLOW_KEY_PUT(match, phy.priority,
+			  nla_get_u32(a[OVS_KEY_ATTR_PRIORITY]), is_mask);
+		*attrs &= ~(1 << OVS_KEY_ATTR_PRIORITY);
+	}
+
+	if (*attrs & (1 << OVS_KEY_ATTR_IN_PORT)) {
+		u32 in_port = nla_get_u32(a[OVS_KEY_ATTR_IN_PORT]);
+
+		if (is_mask) {
+			in_port = 0xffffffff; /* Always exact match in_port. */
+		} else if (in_port >= DP_MAX_PORTS) {
+			OVS_NLERR(log, "Port %d exceeds max allowable %d",
+				  in_port, DP_MAX_PORTS);
+			return -EINVAL;
+		}
+
+		SW_FLOW_KEY_PUT(match, phy.in_port, in_port, is_mask);
+		*attrs &= ~(1 << OVS_KEY_ATTR_IN_PORT);
+	} else if (!is_mask) {
+		SW_FLOW_KEY_PUT(match, phy.in_port, DP_MAX_PORTS, is_mask);
+	}
+
+	if (*attrs & (1 << OVS_KEY_ATTR_SKB_MARK)) {
+		uint32_t mark = nla_get_u32(a[OVS_KEY_ATTR_SKB_MARK]);
+
+		SW_FLOW_KEY_PUT(match, phy.skb_mark, mark, is_mask);
+		*attrs &= ~(1 << OVS_KEY_ATTR_SKB_MARK);
+	}
+	if (*attrs & (1 << OVS_KEY_ATTR_TUNNEL)) {
+		if (ip_tun_from_nlattr(a[OVS_KEY_ATTR_TUNNEL], match,
+				       is_mask, log) < 0)
+			return -EINVAL;
+		*attrs &= ~(1 << OVS_KEY_ATTR_TUNNEL);
+	}
+
+	if (*attrs & (1 << OVS_KEY_ATTR_CT_STATE) &&
+	    ovs_ct_verify(net, OVS_KEY_ATTR_CT_STATE)) {
+		u32 ct_state = nla_get_u32(a[OVS_KEY_ATTR_CT_STATE]);
+
+		if (ct_state & ~CT_SUPPORTED_MASK) {
+			OVS_NLERR(log, "ct_state flags %08x unsupported",
+				  ct_state);
+			return -EINVAL;
+		}
+
+		SW_FLOW_KEY_PUT(match, ct_state, ct_state, is_mask);
+		*attrs &= ~(1ULL << OVS_KEY_ATTR_CT_STATE);
+	}
+	if (*attrs & (1 << OVS_KEY_ATTR_CT_ZONE) &&
+	    ovs_ct_verify(net, OVS_KEY_ATTR_CT_ZONE)) {
+		u16 ct_zone = nla_get_u16(a[OVS_KEY_ATTR_CT_ZONE]);
+
+		SW_FLOW_KEY_PUT(match, ct_zone, ct_zone, is_mask);
+		*attrs &= ~(1ULL << OVS_KEY_ATTR_CT_ZONE);
+	}
+	if (*attrs & (1 << OVS_KEY_ATTR_CT_MARK) &&
+	    ovs_ct_verify(net, OVS_KEY_ATTR_CT_MARK)) {
+		u32 mark = nla_get_u32(a[OVS_KEY_ATTR_CT_MARK]);
+
+		SW_FLOW_KEY_PUT(match, ct.mark, mark, is_mask);
+		*attrs &= ~(1ULL << OVS_KEY_ATTR_CT_MARK);
+	}
+	if (*attrs & (1 << OVS_KEY_ATTR_CT_LABELS) &&
+	    ovs_ct_verify(net, OVS_KEY_ATTR_CT_LABELS)) {
+		const struct ovs_key_ct_labels *cl;
+
+		cl = nla_data(a[OVS_KEY_ATTR_CT_LABELS]);
+		SW_FLOW_KEY_MEMCPY(match, ct.labels, cl->ct_labels,
+				   sizeof(*cl), is_mask);
+		*attrs &= ~(1ULL << OVS_KEY_ATTR_CT_LABELS);
+	}
+	if (*attrs & (1ULL << OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV4)) {
+		const struct ovs_key_ct_tuple_ipv4 *ct;
+
+		ct = nla_data(a[OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV4]);
+
+		SW_FLOW_KEY_PUT(match, ipv4.ct_orig.src, ct->ipv4_src, is_mask);
+		SW_FLOW_KEY_PUT(match, ipv4.ct_orig.dst, ct->ipv4_dst, is_mask);
+		SW_FLOW_KEY_PUT(match, ct.orig_tp.src, ct->src_port, is_mask);
+		SW_FLOW_KEY_PUT(match, ct.orig_tp.dst, ct->dst_port, is_mask);
+		SW_FLOW_KEY_PUT(match, ct_orig_proto, ct->ipv4_proto, is_mask);
+		*attrs &= ~(1ULL << OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV4);
+	}
+	if (*attrs & (1ULL << OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV6)) {
+		const struct ovs_key_ct_tuple_ipv6 *ct;
+
+		ct = nla_data(a[OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV6]);
+
+		SW_FLOW_KEY_MEMCPY(match, ipv6.ct_orig.src, &ct->ipv6_src,
+				   sizeof(match->key->ipv6.ct_orig.src),
+				   is_mask);
+		SW_FLOW_KEY_MEMCPY(match, ipv6.ct_orig.dst, &ct->ipv6_dst,
+				   sizeof(match->key->ipv6.ct_orig.dst),
+				   is_mask);
+		SW_FLOW_KEY_PUT(match, ct.orig_tp.src, ct->src_port, is_mask);
+		SW_FLOW_KEY_PUT(match, ct.orig_tp.dst, ct->dst_port, is_mask);
+		SW_FLOW_KEY_PUT(match, ct_orig_proto, ct->ipv6_proto, is_mask);
+		*attrs &= ~(1ULL << OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV6);
+	}
+
+	/* For layer 3 packets the Ethernet type is provided
+	 * and treated as metadata but no MAC addresses are provided.
+	 */
+	if (!(*attrs & (1ULL << OVS_KEY_ATTR_ETHERNET)) &&
+	    (*attrs & (1ULL << OVS_KEY_ATTR_ETHERTYPE)))
+		mac_proto = MAC_PROTO_NONE;
+
+	/* Always exact match mac_proto */
+	SW_FLOW_KEY_PUT(match, mac_proto, is_mask ? 0xff : mac_proto, is_mask);
+
+	if (mac_proto == MAC_PROTO_NONE)
+		return parse_eth_type_from_nlattrs(match, attrs, a, is_mask,
+						   log);
+
+	return 0;
+}
+
+int nsh_hdr_from_nlattr(const struct nlattr *attr,
+			struct nshhdr *nh, size_t size)
+{
+	struct nlattr *a;
+	int rem;
+	u8 flags = 0;
+	u8 ttl = 0;
+	int mdlen = 0;
+
+	/* validate_nsh has check this, so we needn't do duplicate check here
+	 */
+	if (size < NSH_BASE_HDR_LEN)
+		return -ENOBUFS;
+
+	nla_for_each_nested(a, attr, rem) {
+		int type = nla_type(a);
+
+		switch (type) {
+		case OVS_NSH_KEY_ATTR_BASE: {
+			const struct ovs_nsh_key_base *base = nla_data(a);
+
+			flags = base->flags;
+			ttl = base->ttl;
+			nh->np = base->np;
+			nh->mdtype = base->mdtype;
+			nh->path_hdr = base->path_hdr;
+			break;
+		}
+		case OVS_NSH_KEY_ATTR_MD1:
+			mdlen = nla_len(a);
+			if (mdlen > size - NSH_BASE_HDR_LEN)
+				return -ENOBUFS;
+			memcpy(&nh->md1, nla_data(a), mdlen);
+			break;
+
+		case OVS_NSH_KEY_ATTR_MD2:
+			mdlen = nla_len(a);
+			if (mdlen > size - NSH_BASE_HDR_LEN)
+				return -ENOBUFS;
+			memcpy(&nh->md2, nla_data(a), mdlen);
+			break;
+
+		default:
+			return -EINVAL;
+		}
+	}
+
+	/* nsh header length  = NSH_BASE_HDR_LEN + mdlen */
+	nh->ver_flags_ttl_len = 0;
+	nsh_set_flags_ttl_len(nh, flags, ttl, NSH_BASE_HDR_LEN + mdlen);
+
+	return 0;
+}
+
+int nsh_key_from_nlattr(const struct nlattr *attr,
+			struct ovs_key_nsh *nsh, struct ovs_key_nsh *nsh_mask)
+{
+	struct nlattr *a;
+	int rem;
+
+	/* validate_nsh has check this, so we needn't do duplicate check here
+	 */
+	nla_for_each_nested(a, attr, rem) {
+		int type = nla_type(a);
+
+		switch (type) {
+		case OVS_NSH_KEY_ATTR_BASE: {
+			const struct ovs_nsh_key_base *base = nla_data(a);
+			const struct ovs_nsh_key_base *base_mask = base + 1;
+
+			nsh->base = *base;
+			nsh_mask->base = *base_mask;
+			break;
+		}
+		case OVS_NSH_KEY_ATTR_MD1: {
+			const struct ovs_nsh_key_md1 *md1 = nla_data(a);
+			const struct ovs_nsh_key_md1 *md1_mask = md1 + 1;
+
+			memcpy(nsh->context, md1->context, sizeof(*md1));
+			memcpy(nsh_mask->context, md1_mask->context,
+			       sizeof(*md1_mask));
+			break;
+		}
+		case OVS_NSH_KEY_ATTR_MD2:
+			/* Not supported yet */
+			return -ENOTSUPP;
+		default:
+			return -EINVAL;
+		}
+	}
+
+	return 0;
+}
+
+static int nsh_key_put_from_nlattr(const struct nlattr *attr,
+				   struct sw_flow_match *match, bool is_mask,
+				   bool is_push_nsh, bool log)
+{
+	struct nlattr *a;
+	int rem;
+	bool has_base = false;
+	bool has_md1 = false;
+	bool has_md2 = false;
+	u8 mdtype = 0;
+	int mdlen = 0;
+
+	if (WARN_ON(is_push_nsh && is_mask))
+		return -EINVAL;
+
+	nla_for_each_nested(a, attr, rem) {
+		int type = nla_type(a);
+		int i;
+
+		if (type > OVS_NSH_KEY_ATTR_MAX) {
+			OVS_NLERR(log, "nsh attr %d is out of range max %d",
+				  type, OVS_NSH_KEY_ATTR_MAX);
+			return -EINVAL;
+		}
+
+		if (!check_attr_len(nla_len(a),
+				    ovs_nsh_key_attr_lens[type].len)) {
+			OVS_NLERR(
+			    log,
+			    "nsh attr %d has unexpected len %d expected %d",
+			    type,
+			    nla_len(a),
+			    ovs_nsh_key_attr_lens[type].len
+			);
+			return -EINVAL;
+		}
+
+		switch (type) {
+		case OVS_NSH_KEY_ATTR_BASE: {
+			const struct ovs_nsh_key_base *base = nla_data(a);
+
+			has_base = true;
+			mdtype = base->mdtype;
+			SW_FLOW_KEY_PUT(match, nsh.base.flags,
+					base->flags, is_mask);
+			SW_FLOW_KEY_PUT(match, nsh.base.ttl,
+					base->ttl, is_mask);
+			SW_FLOW_KEY_PUT(match, nsh.base.mdtype,
+					base->mdtype, is_mask);
+			SW_FLOW_KEY_PUT(match, nsh.base.np,
+					base->np, is_mask);
+			SW_FLOW_KEY_PUT(match, nsh.base.path_hdr,
+					base->path_hdr, is_mask);
+			break;
+		}
+		case OVS_NSH_KEY_ATTR_MD1: {
+			const struct ovs_nsh_key_md1 *md1 = nla_data(a);
+
+			has_md1 = true;
+			for (i = 0; i < NSH_MD1_CONTEXT_SIZE; i++)
+				SW_FLOW_KEY_PUT(match, nsh.context[i],
+						md1->context[i], is_mask);
+			break;
+		}
+		case OVS_NSH_KEY_ATTR_MD2:
+			if (!is_push_nsh) /* Not supported MD type 2 yet */
+				return -ENOTSUPP;
+
+			has_md2 = true;
+			mdlen = nla_len(a);
+			if (mdlen > NSH_CTX_HDRS_MAX_LEN || mdlen <= 0) {
+				OVS_NLERR(
+				    log,
+				    "Invalid MD length %d for MD type %d",
+				    mdlen,
+				    mdtype
+				);
+				return -EINVAL;
+			}
+			break;
+		default:
+			OVS_NLERR(log, "Unknown nsh attribute %d",
+				  type);
+			return -EINVAL;
+		}
+	}
+
+	if (rem > 0) {
+		OVS_NLERR(log, "nsh attribute has %d unknown bytes.", rem);
+		return -EINVAL;
+	}
+
+	if (has_md1 && has_md2) {
+		OVS_NLERR(
+		    1,
+		    "invalid nsh attribute: md1 and md2 are exclusive."
+		);
+		return -EINVAL;
+	}
+
+	if (!is_mask) {
+		if ((has_md1 && mdtype != NSH_M_TYPE1) ||
+		    (has_md2 && mdtype != NSH_M_TYPE2)) {
+			OVS_NLERR(1, "nsh attribute has unmatched MD type %d.",
+				  mdtype);
+			return -EINVAL;
+		}
+
+		if (is_push_nsh &&
+		    (!has_base || (!has_md1 && !has_md2))) {
+			OVS_NLERR(
+			    1,
+			    "push_nsh: missing base or metadata attributes"
+			);
+			return -EINVAL;
+		}
+	}
+
+	return 0;
+}
+
+static int ovs_key_from_nlattrs(struct net *net, struct sw_flow_match *match,
+				u64 attrs, const struct nlattr **a,
+				bool is_mask, bool log)
+{
+	int err;
+
+	err = metadata_from_nlattrs(net, match, &attrs, a, is_mask, log);
+	if (err)
+		return err;
+
+	if (attrs & (1 << OVS_KEY_ATTR_ETHERNET)) {
+		const struct ovs_key_ethernet *eth_key;
+
+		eth_key = nla_data(a[OVS_KEY_ATTR_ETHERNET]);
+		SW_FLOW_KEY_MEMCPY(match, eth.src,
+				eth_key->eth_src, ETH_ALEN, is_mask);
+		SW_FLOW_KEY_MEMCPY(match, eth.dst,
+				eth_key->eth_dst, ETH_ALEN, is_mask);
+		attrs &= ~(1 << OVS_KEY_ATTR_ETHERNET);
+
+		if (attrs & (1 << OVS_KEY_ATTR_VLAN)) {
+			/* VLAN attribute is always parsed before getting here since it
+			 * may occur multiple times.
+			 */
+			OVS_NLERR(log, "VLAN attribute unexpected.");
+			return -EINVAL;
+		}
+
+		if (attrs & (1 << OVS_KEY_ATTR_ETHERTYPE)) {
+			err = parse_eth_type_from_nlattrs(match, &attrs, a, is_mask,
+							  log);
+			if (err)
+				return err;
+		} else if (!is_mask) {
+			SW_FLOW_KEY_PUT(match, eth.type, htons(ETH_P_802_2), is_mask);
+		}
+	} else if (!match->key->eth.type) {
+		OVS_NLERR(log, "Either Ethernet header or EtherType is required.");
+		return -EINVAL;
+	}
+
+	if (attrs & (1 << OVS_KEY_ATTR_IPV4)) {
+		const struct ovs_key_ipv4 *ipv4_key;
+
+		ipv4_key = nla_data(a[OVS_KEY_ATTR_IPV4]);
+		if (!is_mask && ipv4_key->ipv4_frag > OVS_FRAG_TYPE_MAX) {
+			OVS_NLERR(log, "IPv4 frag type %d is out of range max %d",
+				  ipv4_key->ipv4_frag, OVS_FRAG_TYPE_MAX);
+			return -EINVAL;
+		}
+		SW_FLOW_KEY_PUT(match, ip.proto,
+				ipv4_key->ipv4_proto, is_mask);
+		SW_FLOW_KEY_PUT(match, ip.tos,
+				ipv4_key->ipv4_tos, is_mask);
+		SW_FLOW_KEY_PUT(match, ip.ttl,
+				ipv4_key->ipv4_ttl, is_mask);
+		SW_FLOW_KEY_PUT(match, ip.frag,
+				ipv4_key->ipv4_frag, is_mask);
+		SW_FLOW_KEY_PUT(match, ipv4.addr.src,
+				ipv4_key->ipv4_src, is_mask);
+		SW_FLOW_KEY_PUT(match, ipv4.addr.dst,
+				ipv4_key->ipv4_dst, is_mask);
+		attrs &= ~(1 << OVS_KEY_ATTR_IPV4);
+	}
+
+	if (attrs & (1 << OVS_KEY_ATTR_IPV6)) {
+		const struct ovs_key_ipv6 *ipv6_key;
+
+		ipv6_key = nla_data(a[OVS_KEY_ATTR_IPV6]);
+		if (!is_mask && ipv6_key->ipv6_frag > OVS_FRAG_TYPE_MAX) {
+			OVS_NLERR(log, "IPv6 frag type %d is out of range max %d",
+				  ipv6_key->ipv6_frag, OVS_FRAG_TYPE_MAX);
+			return -EINVAL;
+		}
+
+		if (!is_mask && ipv6_key->ipv6_label & htonl(0xFFF00000)) {
+			OVS_NLERR(log, "IPv6 flow label %x is out of range (max=%x)",
+				  ntohl(ipv6_key->ipv6_label), (1 << 20) - 1);
+			return -EINVAL;
+		}
+
+		SW_FLOW_KEY_PUT(match, ipv6.label,
+				ipv6_key->ipv6_label, is_mask);
+		SW_FLOW_KEY_PUT(match, ip.proto,
+				ipv6_key->ipv6_proto, is_mask);
+		SW_FLOW_KEY_PUT(match, ip.tos,
+				ipv6_key->ipv6_tclass, is_mask);
+		SW_FLOW_KEY_PUT(match, ip.ttl,
+				ipv6_key->ipv6_hlimit, is_mask);
+		SW_FLOW_KEY_PUT(match, ip.frag,
+				ipv6_key->ipv6_frag, is_mask);
+		SW_FLOW_KEY_MEMCPY(match, ipv6.addr.src,
+				ipv6_key->ipv6_src,
+				sizeof(match->key->ipv6.addr.src),
+				is_mask);
+		SW_FLOW_KEY_MEMCPY(match, ipv6.addr.dst,
+				ipv6_key->ipv6_dst,
+				sizeof(match->key->ipv6.addr.dst),
+				is_mask);
+
+		attrs &= ~(1 << OVS_KEY_ATTR_IPV6);
+	}
+
+	if (attrs & (1 << OVS_KEY_ATTR_ARP)) {
+		const struct ovs_key_arp *arp_key;
+
+		arp_key = nla_data(a[OVS_KEY_ATTR_ARP]);
+		if (!is_mask && (arp_key->arp_op & htons(0xff00))) {
+			OVS_NLERR(log, "Unknown ARP opcode (opcode=%d).",
+				  arp_key->arp_op);
+			return -EINVAL;
+		}
+
+		SW_FLOW_KEY_PUT(match, ipv4.addr.src,
+				arp_key->arp_sip, is_mask);
+		SW_FLOW_KEY_PUT(match, ipv4.addr.dst,
+			arp_key->arp_tip, is_mask);
+		SW_FLOW_KEY_PUT(match, ip.proto,
+				ntohs(arp_key->arp_op), is_mask);
+		SW_FLOW_KEY_MEMCPY(match, ipv4.arp.sha,
+				arp_key->arp_sha, ETH_ALEN, is_mask);
+		SW_FLOW_KEY_MEMCPY(match, ipv4.arp.tha,
+				arp_key->arp_tha, ETH_ALEN, is_mask);
+
+		attrs &= ~(1 << OVS_KEY_ATTR_ARP);
+	}
+
+	if (attrs & (1 << OVS_KEY_ATTR_NSH)) {
+		if (nsh_key_put_from_nlattr(a[OVS_KEY_ATTR_NSH], match,
+					    is_mask, false, log) < 0)
+			return -EINVAL;
+		attrs &= ~(1 << OVS_KEY_ATTR_NSH);
+	}
+
+	if (attrs & (1 << OVS_KEY_ATTR_MPLS)) {
+		const struct ovs_key_mpls *mpls_key;
+
+		mpls_key = nla_data(a[OVS_KEY_ATTR_MPLS]);
+		SW_FLOW_KEY_PUT(match, mpls.top_lse,
+				mpls_key->mpls_lse, is_mask);
+
+		attrs &= ~(1 << OVS_KEY_ATTR_MPLS);
+	 }
+
+	if (attrs & (1 << OVS_KEY_ATTR_TCP)) {
+		const struct ovs_key_tcp *tcp_key;
+
+		tcp_key = nla_data(a[OVS_KEY_ATTR_TCP]);
+		SW_FLOW_KEY_PUT(match, tp.src, tcp_key->tcp_src, is_mask);
+		SW_FLOW_KEY_PUT(match, tp.dst, tcp_key->tcp_dst, is_mask);
+		attrs &= ~(1 << OVS_KEY_ATTR_TCP);
+	}
+
+	if (attrs & (1 << OVS_KEY_ATTR_TCP_FLAGS)) {
+		SW_FLOW_KEY_PUT(match, tp.flags,
+				nla_get_be16(a[OVS_KEY_ATTR_TCP_FLAGS]),
+				is_mask);
+		attrs &= ~(1 << OVS_KEY_ATTR_TCP_FLAGS);
+	}
+
+	if (attrs & (1 << OVS_KEY_ATTR_UDP)) {
+		const struct ovs_key_udp *udp_key;
+
+		udp_key = nla_data(a[OVS_KEY_ATTR_UDP]);
+		SW_FLOW_KEY_PUT(match, tp.src, udp_key->udp_src, is_mask);
+		SW_FLOW_KEY_PUT(match, tp.dst, udp_key->udp_dst, is_mask);
+		attrs &= ~(1 << OVS_KEY_ATTR_UDP);
+	}
+
+	if (attrs & (1 << OVS_KEY_ATTR_SCTP)) {
+		const struct ovs_key_sctp *sctp_key;
+
+		sctp_key = nla_data(a[OVS_KEY_ATTR_SCTP]);
+		SW_FLOW_KEY_PUT(match, tp.src, sctp_key->sctp_src, is_mask);
+		SW_FLOW_KEY_PUT(match, tp.dst, sctp_key->sctp_dst, is_mask);
+		attrs &= ~(1 << OVS_KEY_ATTR_SCTP);
+	}
+
+	if (attrs & (1 << OVS_KEY_ATTR_ICMP)) {
+		const struct ovs_key_icmp *icmp_key;
+
+		icmp_key = nla_data(a[OVS_KEY_ATTR_ICMP]);
+		SW_FLOW_KEY_PUT(match, tp.src,
+				htons(icmp_key->icmp_type), is_mask);
+		SW_FLOW_KEY_PUT(match, tp.dst,
+				htons(icmp_key->icmp_code), is_mask);
+		attrs &= ~(1 << OVS_KEY_ATTR_ICMP);
+	}
+
+	if (attrs & (1 << OVS_KEY_ATTR_ICMPV6)) {
+		const struct ovs_key_icmpv6 *icmpv6_key;
+
+		icmpv6_key = nla_data(a[OVS_KEY_ATTR_ICMPV6]);
+		SW_FLOW_KEY_PUT(match, tp.src,
+				htons(icmpv6_key->icmpv6_type), is_mask);
+		SW_FLOW_KEY_PUT(match, tp.dst,
+				htons(icmpv6_key->icmpv6_code), is_mask);
+		attrs &= ~(1 << OVS_KEY_ATTR_ICMPV6);
+	}
+
+	if (attrs & (1 << OVS_KEY_ATTR_ND)) {
+		const struct ovs_key_nd *nd_key;
+
+		nd_key = nla_data(a[OVS_KEY_ATTR_ND]);
+		SW_FLOW_KEY_MEMCPY(match, ipv6.nd.target,
+			nd_key->nd_target,
+			sizeof(match->key->ipv6.nd.target),
+			is_mask);
+		SW_FLOW_KEY_MEMCPY(match, ipv6.nd.sll,
+			nd_key->nd_sll, ETH_ALEN, is_mask);
+		SW_FLOW_KEY_MEMCPY(match, ipv6.nd.tll,
+				nd_key->nd_tll, ETH_ALEN, is_mask);
+		attrs &= ~(1 << OVS_KEY_ATTR_ND);
+	}
+
+	if (attrs != 0) {
+		OVS_NLERR(log, "Unknown key attributes %llx",
+			  (unsigned long long)attrs);
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static void nlattr_set(struct nlattr *attr, u8 val,
+		       const struct ovs_len_tbl *tbl)
+{
+	struct nlattr *nla;
+	int rem;
+
+	/* The nlattr stream should already have been validated */
+	nla_for_each_nested(nla, attr, rem) {
+		if (tbl[nla_type(nla)].len == OVS_ATTR_NESTED)
+			nlattr_set(nla, val, tbl[nla_type(nla)].next ? : tbl);
+		else
+			memset(nla_data(nla), val, nla_len(nla));
+
+		if (nla_type(nla) == OVS_KEY_ATTR_CT_STATE)
+			*(u32 *)nla_data(nla) &= CT_SUPPORTED_MASK;
+	}
+}
+
+static void mask_set_nlattr(struct nlattr *attr, u8 val)
+{
+	nlattr_set(attr, val, ovs_key_lens);
+}
+
+/**
+ * ovs_nla_get_match - parses Netlink attributes into a flow key and
+ * mask. In case the 'mask' is NULL, the flow is treated as exact match
+ * flow. Otherwise, it is treated as a wildcarded flow, except the mask
+ * does not include any don't care bit.
+ * @net: Used to determine per-namespace field support.
+ * @match: receives the extracted flow match information.
+ * @key: Netlink attribute holding nested %OVS_KEY_ATTR_* Netlink attribute
+ * sequence. The fields should of the packet that triggered the creation
+ * of this flow.
+ * @mask: Optional. Netlink attribute holding nested %OVS_KEY_ATTR_* Netlink
+ * attribute specifies the mask field of the wildcarded flow.
+ * @log: Boolean to allow kernel error logging.  Normally true, but when
+ * probing for feature compatibility this should be passed in as false to
+ * suppress unnecessary error logging.
+ */
+int ovs_nla_get_match(struct net *net, struct sw_flow_match *match,
+		      const struct nlattr *nla_key,
+		      const struct nlattr *nla_mask,
+		      bool log)
+{
+	const struct nlattr *a[OVS_KEY_ATTR_MAX + 1];
+	struct nlattr *newmask = NULL;
+	u64 key_attrs = 0;
+	u64 mask_attrs = 0;
+	int err;
+
+	err = parse_flow_nlattrs(nla_key, a, &key_attrs, log);
+	if (err)
+		return err;
+
+	err = parse_vlan_from_nlattrs(match, &key_attrs, a, false, log);
+	if (err)
+		return err;
+
+	err = ovs_key_from_nlattrs(net, match, key_attrs, a, false, log);
+	if (err)
+		return err;
+
+	if (match->mask) {
+		if (!nla_mask) {
+			/* Create an exact match mask. We need to set to 0xff
+			 * all the 'match->mask' fields that have been touched
+			 * in 'match->key'. We cannot simply memset
+			 * 'match->mask', because padding bytes and fields not
+			 * specified in 'match->key' should be left to 0.
+			 * Instead, we use a stream of netlink attributes,
+			 * copied from 'key' and set to 0xff.
+			 * ovs_key_from_nlattrs() will take care of filling
+			 * 'match->mask' appropriately.
+			 */
+			newmask = kmemdup(nla_key,
+					  nla_total_size(nla_len(nla_key)),
+					  GFP_KERNEL);
+			if (!newmask)
+				return -ENOMEM;
+
+			mask_set_nlattr(newmask, 0xff);
+
+			/* The userspace does not send tunnel attributes that
+			 * are 0, but we should not wildcard them nonetheless.
+			 */
+			if (match->key->tun_proto)
+				SW_FLOW_KEY_MEMSET_FIELD(match, tun_key,
+							 0xff, true);
+
+			nla_mask = newmask;
+		}
+
+		err = parse_flow_mask_nlattrs(nla_mask, a, &mask_attrs, log);
+		if (err)
+			goto free_newmask;
+
+		/* Always match on tci. */
+		SW_FLOW_KEY_PUT(match, eth.vlan.tci, htons(0xffff), true);
+		SW_FLOW_KEY_PUT(match, eth.cvlan.tci, htons(0xffff), true);
+
+		err = parse_vlan_from_nlattrs(match, &mask_attrs, a, true, log);
+		if (err)
+			goto free_newmask;
+
+		err = ovs_key_from_nlattrs(net, match, mask_attrs, a, true,
+					   log);
+		if (err)
+			goto free_newmask;
+	}
+
+	if (!match_validate(match, key_attrs, mask_attrs, log))
+		err = -EINVAL;
+
+free_newmask:
+	kfree(newmask);
+	return err;
+}
+
+static size_t get_ufid_len(const struct nlattr *attr, bool log)
+{
+	size_t len;
+
+	if (!attr)
+		return 0;
+
+	len = nla_len(attr);
+	if (len < 1 || len > MAX_UFID_LENGTH) {
+		OVS_NLERR(log, "ufid size %u bytes exceeds the range (1, %d)",
+			  nla_len(attr), MAX_UFID_LENGTH);
+		return 0;
+	}
+
+	return len;
+}
+
+/* Initializes 'flow->ufid', returning true if 'attr' contains a valid UFID,
+ * or false otherwise.
+ */
+bool ovs_nla_get_ufid(struct sw_flow_id *sfid, const struct nlattr *attr,
+		      bool log)
+{
+	sfid->ufid_len = get_ufid_len(attr, log);
+	if (sfid->ufid_len)
+		memcpy(sfid->ufid, nla_data(attr), sfid->ufid_len);
+
+	return sfid->ufid_len;
+}
+
+int ovs_nla_get_identifier(struct sw_flow_id *sfid, const struct nlattr *ufid,
+			   const struct sw_flow_key *key, bool log)
+{
+	struct sw_flow_key *new_key;
+
+	if (ovs_nla_get_ufid(sfid, ufid, log))
+		return 0;
+
+	/* If UFID was not provided, use unmasked key. */
+	new_key = kmalloc(sizeof(*new_key), GFP_KERNEL);
+	if (!new_key)
+		return -ENOMEM;
+	memcpy(new_key, key, sizeof(*key));
+	sfid->unmasked_key = new_key;
+
+	return 0;
+}
+
+u32 ovs_nla_get_ufid_flags(const struct nlattr *attr)
+{
+	return attr ? nla_get_u32(attr) : 0;
+}
+
+/**
+ * ovs_nla_get_flow_metadata - parses Netlink attributes into a flow key.
+ * @net: Network namespace.
+ * @key: Receives extracted in_port, priority, tun_key, skb_mark and conntrack
+ * metadata.
+ * @a: Array of netlink attributes holding parsed %OVS_KEY_ATTR_* Netlink
+ * attributes.
+ * @attrs: Bit mask for the netlink attributes included in @a.
+ * @log: Boolean to allow kernel error logging.  Normally true, but when
+ * probing for feature compatibility this should be passed in as false to
+ * suppress unnecessary error logging.
+ *
+ * This parses a series of Netlink attributes that form a flow key, which must
+ * take the same form accepted by flow_from_nlattrs(), but only enough of it to
+ * get the metadata, that is, the parts of the flow key that cannot be
+ * extracted from the packet itself.
+ *
+ * This must be called before the packet key fields are filled in 'key'.
+ */
+
+int ovs_nla_get_flow_metadata(struct net *net,
+			      const struct nlattr *a[OVS_KEY_ATTR_MAX + 1],
+			      u64 attrs, struct sw_flow_key *key, bool log)
+{
+	struct sw_flow_match match;
+
+	memset(&match, 0, sizeof(match));
+	match.key = key;
+
+	key->ct_state = 0;
+	key->ct_zone = 0;
+	key->ct_orig_proto = 0;
+	memset(&key->ct, 0, sizeof(key->ct));
+	memset(&key->ipv4.ct_orig, 0, sizeof(key->ipv4.ct_orig));
+	memset(&key->ipv6.ct_orig, 0, sizeof(key->ipv6.ct_orig));
+
+	key->phy.in_port = DP_MAX_PORTS;
+
+	return metadata_from_nlattrs(net, &match, &attrs, a, false, log);
+}
+
+static int ovs_nla_put_vlan(struct sk_buff *skb, const struct vlan_head *vh,
+			    bool is_mask)
+{
+	__be16 eth_type = !is_mask ? vh->tpid : htons(0xffff);
+
+	if (nla_put_be16(skb, OVS_KEY_ATTR_ETHERTYPE, eth_type) ||
+	    nla_put_be16(skb, OVS_KEY_ATTR_VLAN, vh->tci))
+		return -EMSGSIZE;
+	return 0;
+}
+
+static int nsh_key_to_nlattr(const struct ovs_key_nsh *nsh, bool is_mask,
+			     struct sk_buff *skb)
+{
+	struct nlattr *start;
+
+	start = nla_nest_start(skb, OVS_KEY_ATTR_NSH);
+	if (!start)
+		return -EMSGSIZE;
+
+	if (nla_put(skb, OVS_NSH_KEY_ATTR_BASE, sizeof(nsh->base), &nsh->base))
+		goto nla_put_failure;
+
+	if (is_mask || nsh->base.mdtype == NSH_M_TYPE1) {
+		if (nla_put(skb, OVS_NSH_KEY_ATTR_MD1,
+			    sizeof(nsh->context), nsh->context))
+			goto nla_put_failure;
+	}
+
+	/* Don't support MD type 2 yet */
+
+	nla_nest_end(skb, start);
+
+	return 0;
+
+nla_put_failure:
+	return -EMSGSIZE;
+}
+
+static int __ovs_nla_put_key(const struct sw_flow_key *swkey,
+			     const struct sw_flow_key *output, bool is_mask,
+			     struct sk_buff *skb)
+{
+	struct ovs_key_ethernet *eth_key;
+	struct nlattr *nla;
+	struct nlattr *encap = NULL;
+	struct nlattr *in_encap = NULL;
+
+	if (nla_put_u32(skb, OVS_KEY_ATTR_RECIRC_ID, output->recirc_id))
+		goto nla_put_failure;
+
+	if (nla_put_u32(skb, OVS_KEY_ATTR_DP_HASH, output->ovs_flow_hash))
+		goto nla_put_failure;
+
+	if (nla_put_u32(skb, OVS_KEY_ATTR_PRIORITY, output->phy.priority))
+		goto nla_put_failure;
+
+	if ((swkey->tun_proto || is_mask)) {
+		const void *opts = NULL;
+
+		if (output->tun_key.tun_flags & TUNNEL_OPTIONS_PRESENT)
+			opts = TUN_METADATA_OPTS(output, swkey->tun_opts_len);
+
+		if (ip_tun_to_nlattr(skb, &output->tun_key, opts,
+				     swkey->tun_opts_len, swkey->tun_proto))
+			goto nla_put_failure;
+	}
+
+	if (swkey->phy.in_port == DP_MAX_PORTS) {
+		if (is_mask && (output->phy.in_port == 0xffff))
+			if (nla_put_u32(skb, OVS_KEY_ATTR_IN_PORT, 0xffffffff))
+				goto nla_put_failure;
+	} else {
+		u16 upper_u16;
+		upper_u16 = !is_mask ? 0 : 0xffff;
+
+		if (nla_put_u32(skb, OVS_KEY_ATTR_IN_PORT,
+				(upper_u16 << 16) | output->phy.in_port))
+			goto nla_put_failure;
+	}
+
+	if (nla_put_u32(skb, OVS_KEY_ATTR_SKB_MARK, output->phy.skb_mark))
+		goto nla_put_failure;
+
+	if (ovs_ct_put_key(swkey, output, skb))
+		goto nla_put_failure;
+
+	if (ovs_key_mac_proto(swkey) == MAC_PROTO_ETHERNET) {
+		nla = nla_reserve(skb, OVS_KEY_ATTR_ETHERNET, sizeof(*eth_key));
+		if (!nla)
+			goto nla_put_failure;
+
+		eth_key = nla_data(nla);
+		ether_addr_copy(eth_key->eth_src, output->eth.src);
+		ether_addr_copy(eth_key->eth_dst, output->eth.dst);
+
+		if (swkey->eth.vlan.tci || eth_type_vlan(swkey->eth.type)) {
+			if (ovs_nla_put_vlan(skb, &output->eth.vlan, is_mask))
+				goto nla_put_failure;
+			encap = nla_nest_start(skb, OVS_KEY_ATTR_ENCAP);
+			if (!swkey->eth.vlan.tci)
+				goto unencap;
+
+			if (swkey->eth.cvlan.tci || eth_type_vlan(swkey->eth.type)) {
+				if (ovs_nla_put_vlan(skb, &output->eth.cvlan, is_mask))
+					goto nla_put_failure;
+				in_encap = nla_nest_start(skb, OVS_KEY_ATTR_ENCAP);
+				if (!swkey->eth.cvlan.tci)
+					goto unencap;
+			}
+		}
+
+		if (swkey->eth.type == htons(ETH_P_802_2)) {
+			/*
+			* Ethertype 802.2 is represented in the netlink with omitted
+			* OVS_KEY_ATTR_ETHERTYPE in the flow key attribute, and
+			* 0xffff in the mask attribute.  Ethertype can also
+			* be wildcarded.
+			*/
+			if (is_mask && output->eth.type)
+				if (nla_put_be16(skb, OVS_KEY_ATTR_ETHERTYPE,
+							output->eth.type))
+					goto nla_put_failure;
+			goto unencap;
+		}
+	}
+
+	if (nla_put_be16(skb, OVS_KEY_ATTR_ETHERTYPE, output->eth.type))
+		goto nla_put_failure;
+
+	if (eth_type_vlan(swkey->eth.type)) {
+		/* There are 3 VLAN tags, we don't know anything about the rest
+		 * of the packet, so truncate here.
+		 */
+		WARN_ON_ONCE(!(encap && in_encap));
+		goto unencap;
+	}
+
+	if (swkey->eth.type == htons(ETH_P_IP)) {
+		struct ovs_key_ipv4 *ipv4_key;
+
+		nla = nla_reserve(skb, OVS_KEY_ATTR_IPV4, sizeof(*ipv4_key));
+		if (!nla)
+			goto nla_put_failure;
+		ipv4_key = nla_data(nla);
+		ipv4_key->ipv4_src = output->ipv4.addr.src;
+		ipv4_key->ipv4_dst = output->ipv4.addr.dst;
+		ipv4_key->ipv4_proto = output->ip.proto;
+		ipv4_key->ipv4_tos = output->ip.tos;
+		ipv4_key->ipv4_ttl = output->ip.ttl;
+		ipv4_key->ipv4_frag = output->ip.frag;
+	} else if (swkey->eth.type == htons(ETH_P_IPV6)) {
+		struct ovs_key_ipv6 *ipv6_key;
+
+		nla = nla_reserve(skb, OVS_KEY_ATTR_IPV6, sizeof(*ipv6_key));
+		if (!nla)
+			goto nla_put_failure;
+		ipv6_key = nla_data(nla);
+		memcpy(ipv6_key->ipv6_src, &output->ipv6.addr.src,
+				sizeof(ipv6_key->ipv6_src));
+		memcpy(ipv6_key->ipv6_dst, &output->ipv6.addr.dst,
+				sizeof(ipv6_key->ipv6_dst));
+		ipv6_key->ipv6_label = output->ipv6.label;
+		ipv6_key->ipv6_proto = output->ip.proto;
+		ipv6_key->ipv6_tclass = output->ip.tos;
+		ipv6_key->ipv6_hlimit = output->ip.ttl;
+		ipv6_key->ipv6_frag = output->ip.frag;
+	} else if (swkey->eth.type == htons(ETH_P_NSH)) {
+		if (nsh_key_to_nlattr(&output->nsh, is_mask, skb))
+			goto nla_put_failure;
+	} else if (swkey->eth.type == htons(ETH_P_ARP) ||
+		   swkey->eth.type == htons(ETH_P_RARP)) {
+		struct ovs_key_arp *arp_key;
+
+		nla = nla_reserve(skb, OVS_KEY_ATTR_ARP, sizeof(*arp_key));
+		if (!nla)
+			goto nla_put_failure;
+		arp_key = nla_data(nla);
+		memset(arp_key, 0, sizeof(struct ovs_key_arp));
+		arp_key->arp_sip = output->ipv4.addr.src;
+		arp_key->arp_tip = output->ipv4.addr.dst;
+		arp_key->arp_op = htons(output->ip.proto);
+		ether_addr_copy(arp_key->arp_sha, output->ipv4.arp.sha);
+		ether_addr_copy(arp_key->arp_tha, output->ipv4.arp.tha);
+	} else if (eth_p_mpls(swkey->eth.type)) {
+		struct ovs_key_mpls *mpls_key;
+
+		nla = nla_reserve(skb, OVS_KEY_ATTR_MPLS, sizeof(*mpls_key));
+		if (!nla)
+			goto nla_put_failure;
+		mpls_key = nla_data(nla);
+		mpls_key->mpls_lse = output->mpls.top_lse;
+	}
+
+	if ((swkey->eth.type == htons(ETH_P_IP) ||
+	     swkey->eth.type == htons(ETH_P_IPV6)) &&
+	     swkey->ip.frag != OVS_FRAG_TYPE_LATER) {
+
+		if (swkey->ip.proto == IPPROTO_TCP) {
+			struct ovs_key_tcp *tcp_key;
+
+			nla = nla_reserve(skb, OVS_KEY_ATTR_TCP, sizeof(*tcp_key));
+			if (!nla)
+				goto nla_put_failure;
+			tcp_key = nla_data(nla);
+			tcp_key->tcp_src = output->tp.src;
+			tcp_key->tcp_dst = output->tp.dst;
+			if (nla_put_be16(skb, OVS_KEY_ATTR_TCP_FLAGS,
+					 output->tp.flags))
+				goto nla_put_failure;
+		} else if (swkey->ip.proto == IPPROTO_UDP) {
+			struct ovs_key_udp *udp_key;
+
+			nla = nla_reserve(skb, OVS_KEY_ATTR_UDP, sizeof(*udp_key));
+			if (!nla)
+				goto nla_put_failure;
+			udp_key = nla_data(nla);
+			udp_key->udp_src = output->tp.src;
+			udp_key->udp_dst = output->tp.dst;
+		} else if (swkey->ip.proto == IPPROTO_SCTP) {
+			struct ovs_key_sctp *sctp_key;
+
+			nla = nla_reserve(skb, OVS_KEY_ATTR_SCTP, sizeof(*sctp_key));
+			if (!nla)
+				goto nla_put_failure;
+			sctp_key = nla_data(nla);
+			sctp_key->sctp_src = output->tp.src;
+			sctp_key->sctp_dst = output->tp.dst;
+		} else if (swkey->eth.type == htons(ETH_P_IP) &&
+			   swkey->ip.proto == IPPROTO_ICMP) {
+			struct ovs_key_icmp *icmp_key;
+
+			nla = nla_reserve(skb, OVS_KEY_ATTR_ICMP, sizeof(*icmp_key));
+			if (!nla)
+				goto nla_put_failure;
+			icmp_key = nla_data(nla);
+			icmp_key->icmp_type = ntohs(output->tp.src);
+			icmp_key->icmp_code = ntohs(output->tp.dst);
+		} else if (swkey->eth.type == htons(ETH_P_IPV6) &&
+			   swkey->ip.proto == IPPROTO_ICMPV6) {
+			struct ovs_key_icmpv6 *icmpv6_key;
+
+			nla = nla_reserve(skb, OVS_KEY_ATTR_ICMPV6,
+						sizeof(*icmpv6_key));
+			if (!nla)
+				goto nla_put_failure;
+			icmpv6_key = nla_data(nla);
+			icmpv6_key->icmpv6_type = ntohs(output->tp.src);
+			icmpv6_key->icmpv6_code = ntohs(output->tp.dst);
+
+			if (swkey->tp.src == htons(NDISC_NEIGHBOUR_SOLICITATION) ||
+			    swkey->tp.src == htons(NDISC_NEIGHBOUR_ADVERTISEMENT)) {
+				struct ovs_key_nd *nd_key;
+
+				nla = nla_reserve(skb, OVS_KEY_ATTR_ND, sizeof(*nd_key));
+				if (!nla)
+					goto nla_put_failure;
+				nd_key = nla_data(nla);
+				memcpy(nd_key->nd_target, &output->ipv6.nd.target,
+							sizeof(nd_key->nd_target));
+				ether_addr_copy(nd_key->nd_sll, output->ipv6.nd.sll);
+				ether_addr_copy(nd_key->nd_tll, output->ipv6.nd.tll);
+			}
+		}
+	}
+
+unencap:
+	if (in_encap)
+		nla_nest_end(skb, in_encap);
+	if (encap)
+		nla_nest_end(skb, encap);
+
+	return 0;
+
+nla_put_failure:
+	return -EMSGSIZE;
+}
+
+int ovs_nla_put_key(const struct sw_flow_key *swkey,
+		    const struct sw_flow_key *output, int attr, bool is_mask,
+		    struct sk_buff *skb)
+{
+	int err;
+	struct nlattr *nla;
+
+	nla = nla_nest_start(skb, attr);
+	if (!nla)
+		return -EMSGSIZE;
+	err = __ovs_nla_put_key(swkey, output, is_mask, skb);
+	if (err)
+		return err;
+	nla_nest_end(skb, nla);
+
+	return 0;
+}
+
+/* Called with ovs_mutex or RCU read lock. */
+int ovs_nla_put_identifier(const struct sw_flow *flow, struct sk_buff *skb)
+{
+	if (ovs_identifier_is_ufid(&flow->id))
+		return nla_put(skb, OVS_FLOW_ATTR_UFID, flow->id.ufid_len,
+			       flow->id.ufid);
+
+	return ovs_nla_put_key(flow->id.unmasked_key, flow->id.unmasked_key,
+			       OVS_FLOW_ATTR_KEY, false, skb);
+}
+
+/* Called with ovs_mutex or RCU read lock. */
+int ovs_nla_put_masked_key(const struct sw_flow *flow, struct sk_buff *skb)
+{
+	return ovs_nla_put_key(&flow->key, &flow->key,
+				OVS_FLOW_ATTR_KEY, false, skb);
+}
+
+/* Called with ovs_mutex or RCU read lock. */
+int ovs_nla_put_mask(const struct sw_flow *flow, struct sk_buff *skb)
+{
+	return ovs_nla_put_key(&flow->key, &flow->mask->key,
+				OVS_FLOW_ATTR_MASK, true, skb);
+}
+
+#define MAX_ACTIONS_BUFSIZE	(32 * 1024)
+
+static struct sw_flow_actions *nla_alloc_flow_actions(int size)
+{
+	struct sw_flow_actions *sfa;
+
+	WARN_ON_ONCE(size > MAX_ACTIONS_BUFSIZE);
+
+	sfa = kmalloc(sizeof(*sfa) + size, GFP_KERNEL);
+	if (!sfa)
+		return ERR_PTR(-ENOMEM);
+
+	sfa->actions_len = 0;
+	return sfa;
+}
+
+static void ovs_nla_free_nested_actions(const struct nlattr *actions, int len);
+
+static void ovs_nla_free_clone_action(const struct nlattr *action)
+{
+	const struct nlattr *a = nla_data(action);
+	int rem = nla_len(action);
+
+	switch (nla_type(a)) {
+	case OVS_CLONE_ATTR_EXEC:
+		/* The real list of actions follows this attribute. */
+		a = nla_next(a, &rem);
+		ovs_nla_free_nested_actions(a, rem);
+		break;
+	}
+}
+
+static void ovs_nla_free_sample_action(const struct nlattr *action)
+{
+	const struct nlattr *a = nla_data(action);
+	int rem = nla_len(action);
+
+	switch (nla_type(a)) {
+	case OVS_SAMPLE_ATTR_ARG:
+		/* The real list of actions follows this attribute. */
+		a = nla_next(a, &rem);
+		ovs_nla_free_nested_actions(a, rem);
+		break;
+	}
+}
+
+static void ovs_nla_free_set_action(const struct nlattr *a)
+{
+	const struct nlattr *ovs_key = nla_data(a);
+	struct ovs_tunnel_info *ovs_tun;
+
+	switch (nla_type(ovs_key)) {
+	case OVS_KEY_ATTR_TUNNEL_INFO:
+		ovs_tun = nla_data(ovs_key);
+		dst_release((struct dst_entry *)ovs_tun->tun_dst);
+		break;
+	}
+}
+
+static void ovs_nla_free_nested_actions(const struct nlattr *actions, int len)
+{
+	const struct nlattr *a;
+	int rem;
+
+	/* Whenever new actions are added, the need to update this
+	 * function should be considered.
+	 */
+	BUILD_BUG_ON(OVS_ACTION_ATTR_MAX != 20);
+
+	if (!actions)
+		return;
+
+	nla_for_each_attr(a, actions, len, rem) {
+		switch (nla_type(a)) {
+		case OVS_ACTION_ATTR_CLONE:
+			ovs_nla_free_clone_action(a);
+			break;
+
+		case OVS_ACTION_ATTR_CT:
+			ovs_ct_free_action(a);
+			break;
+
+		case OVS_ACTION_ATTR_SAMPLE:
+			ovs_nla_free_sample_action(a);
+			break;
+
+		case OVS_ACTION_ATTR_SET:
+			ovs_nla_free_set_action(a);
+			break;
+		}
+	}
+}
+
+void ovs_nla_free_flow_actions(struct sw_flow_actions *sf_acts)
+{
+	if (!sf_acts)
+		return;
+
+	ovs_nla_free_nested_actions(sf_acts->actions, sf_acts->actions_len);
+	kfree(sf_acts);
+}
+
+static void __ovs_nla_free_flow_actions(struct rcu_head *head)
+{
+	ovs_nla_free_flow_actions(container_of(head, struct sw_flow_actions, rcu));
+}
+
+/* Schedules 'sf_acts' to be freed after the next RCU grace period.
+ * The caller must hold rcu_read_lock for this to be sensible. */
+void ovs_nla_free_flow_actions_rcu(struct sw_flow_actions *sf_acts)
+{
+	call_rcu(&sf_acts->rcu, __ovs_nla_free_flow_actions);
+}
+
+static struct nlattr *reserve_sfa_size(struct sw_flow_actions **sfa,
+				       int attr_len, bool log)
+{
+
+	struct sw_flow_actions *acts;
+	int new_acts_size;
+	size_t req_size = NLA_ALIGN(attr_len);
+	int next_offset = offsetof(struct sw_flow_actions, actions) +
+					(*sfa)->actions_len;
+
+	if (req_size <= (ksize(*sfa) - next_offset))
+		goto out;
+
+	new_acts_size = max(next_offset + req_size, ksize(*sfa) * 2);
+
+	if (new_acts_size > MAX_ACTIONS_BUFSIZE) {
+		if ((next_offset + req_size) > MAX_ACTIONS_BUFSIZE) {
+			OVS_NLERR(log, "Flow action size exceeds max %u",
+				  MAX_ACTIONS_BUFSIZE);
+			return ERR_PTR(-EMSGSIZE);
+		}
+		new_acts_size = MAX_ACTIONS_BUFSIZE;
+	}
+
+	acts = nla_alloc_flow_actions(new_acts_size);
+	if (IS_ERR(acts))
+		return (void *)acts;
+
+	memcpy(acts->actions, (*sfa)->actions, (*sfa)->actions_len);
+	acts->actions_len = (*sfa)->actions_len;
+	acts->orig_len = (*sfa)->orig_len;
+	kfree(*sfa);
+	*sfa = acts;
+
+out:
+	(*sfa)->actions_len += req_size;
+	return  (struct nlattr *) ((unsigned char *)(*sfa) + next_offset);
+}
+
+static struct nlattr *__add_action(struct sw_flow_actions **sfa,
+				   int attrtype, void *data, int len, bool log)
+{
+	struct nlattr *a;
+
+	a = reserve_sfa_size(sfa, nla_attr_size(len), log);
+	if (IS_ERR(a))
+		return a;
+
+	a->nla_type = attrtype;
+	a->nla_len = nla_attr_size(len);
+
+	if (data)
+		memcpy(nla_data(a), data, len);
+	memset((unsigned char *) a + a->nla_len, 0, nla_padlen(len));
+
+	return a;
+}
+
+int ovs_nla_add_action(struct sw_flow_actions **sfa, int attrtype, void *data,
+		       int len, bool log)
+{
+	struct nlattr *a;
+
+	a = __add_action(sfa, attrtype, data, len, log);
+
+	return PTR_ERR_OR_ZERO(a);
+}
+
+static inline int add_nested_action_start(struct sw_flow_actions **sfa,
+					  int attrtype, bool log)
+{
+	int used = (*sfa)->actions_len;
+	int err;
+
+	err = ovs_nla_add_action(sfa, attrtype, NULL, 0, log);
+	if (err)
+		return err;
+
+	return used;
+}
+
+static inline void add_nested_action_end(struct sw_flow_actions *sfa,
+					 int st_offset)
+{
+	struct nlattr *a = (struct nlattr *) ((unsigned char *)sfa->actions +
+							       st_offset);
+
+	a->nla_len = sfa->actions_len - st_offset;
+}
+
+static int __ovs_nla_copy_actions(struct net *net, const struct nlattr *attr,
+				  const struct sw_flow_key *key,
+				  struct sw_flow_actions **sfa,
+				  __be16 eth_type, __be16 vlan_tci, bool log);
+
+static int validate_and_copy_sample(struct net *net, const struct nlattr *attr,
+				    const struct sw_flow_key *key,
+				    struct sw_flow_actions **sfa,
+				    __be16 eth_type, __be16 vlan_tci,
+				    bool log, bool last)
+{
+	const struct nlattr *attrs[OVS_SAMPLE_ATTR_MAX + 1];
+	const struct nlattr *probability, *actions;
+	const struct nlattr *a;
+	int rem, start, err;
+	struct sample_arg arg;
+
+	memset(attrs, 0, sizeof(attrs));
+	nla_for_each_nested(a, attr, rem) {
+		int type = nla_type(a);
+		if (!type || type > OVS_SAMPLE_ATTR_MAX || attrs[type])
+			return -EINVAL;
+		attrs[type] = a;
+	}
+	if (rem)
+		return -EINVAL;
+
+	probability = attrs[OVS_SAMPLE_ATTR_PROBABILITY];
+	if (!probability || nla_len(probability) != sizeof(u32))
+		return -EINVAL;
+
+	actions = attrs[OVS_SAMPLE_ATTR_ACTIONS];
+	if (!actions || (nla_len(actions) && nla_len(actions) < NLA_HDRLEN))
+		return -EINVAL;
+
+	/* validation done, copy sample action. */
+	start = add_nested_action_start(sfa, OVS_ACTION_ATTR_SAMPLE, log);
+	if (start < 0)
+		return start;
+
+	/* When both skb and flow may be changed, put the sample
+	 * into a deferred fifo. On the other hand, if only skb
+	 * may be modified, the actions can be executed in place.
+	 *
+	 * Do this analysis at the flow installation time.
+	 * Set 'clone_action->exec' to true if the actions can be
+	 * executed without being deferred.
+	 *
+	 * If the sample is the last action, it can always be excuted
+	 * rather than deferred.
+	 */
+	arg.exec = last || !actions_may_change_flow(actions);
+	arg.probability = nla_get_u32(probability);
+
+	err = ovs_nla_add_action(sfa, OVS_SAMPLE_ATTR_ARG, &arg, sizeof(arg),
+				 log);
+	if (err)
+		return err;
+
+	err = __ovs_nla_copy_actions(net, actions, key, sfa,
+				     eth_type, vlan_tci, log);
+
+	if (err)
+		return err;
+
+	add_nested_action_end(*sfa, start);
+
+	return 0;
+}
+
+static int validate_and_copy_clone(struct net *net,
+				   const struct nlattr *attr,
+				   const struct sw_flow_key *key,
+				   struct sw_flow_actions **sfa,
+				   __be16 eth_type, __be16 vlan_tci,
+				   bool log, bool last)
+{
+	int start, err;
+	u32 exec;
+
+	if (nla_len(attr) && nla_len(attr) < NLA_HDRLEN)
+		return -EINVAL;
+
+	start = add_nested_action_start(sfa, OVS_ACTION_ATTR_CLONE, log);
+	if (start < 0)
+		return start;
+
+	exec = last || !actions_may_change_flow(attr);
+
+	err = ovs_nla_add_action(sfa, OVS_CLONE_ATTR_EXEC, &exec,
+				 sizeof(exec), log);
+	if (err)
+		return err;
+
+	err = __ovs_nla_copy_actions(net, attr, key, sfa,
+				     eth_type, vlan_tci, log);
+	if (err)
+		return err;
+
+	add_nested_action_end(*sfa, start);
+
+	return 0;
+}
+
+void ovs_match_init(struct sw_flow_match *match,
+		    struct sw_flow_key *key,
+		    bool reset_key,
+		    struct sw_flow_mask *mask)
+{
+	memset(match, 0, sizeof(*match));
+	match->key = key;
+	match->mask = mask;
+
+	if (reset_key)
+		memset(key, 0, sizeof(*key));
+
+	if (mask) {
+		memset(&mask->key, 0, sizeof(mask->key));
+		mask->range.start = mask->range.end = 0;
+	}
+}
+
+static int validate_geneve_opts(struct sw_flow_key *key)
+{
+	struct geneve_opt *option;
+	int opts_len = key->tun_opts_len;
+	bool crit_opt = false;
+
+	option = (struct geneve_opt *)TUN_METADATA_OPTS(key, key->tun_opts_len);
+	while (opts_len > 0) {
+		int len;
+
+		if (opts_len < sizeof(*option))
+			return -EINVAL;
+
+		len = sizeof(*option) + option->length * 4;
+		if (len > opts_len)
+			return -EINVAL;
+
+		crit_opt |= !!(option->type & GENEVE_CRIT_OPT_TYPE);
+
+		option = (struct geneve_opt *)((u8 *)option + len);
+		opts_len -= len;
+	}
+
+	key->tun_key.tun_flags |= crit_opt ? TUNNEL_CRIT_OPT : 0;
+
+	return 0;
+}
+
+static int validate_and_copy_set_tun(const struct nlattr *attr,
+				     struct sw_flow_actions **sfa, bool log)
+{
+	struct sw_flow_match match;
+	struct sw_flow_key key;
+	struct metadata_dst *tun_dst;
+	struct ip_tunnel_info *tun_info;
+	struct ovs_tunnel_info *ovs_tun;
+	struct nlattr *a;
+	int err = 0, start, opts_type;
+	__be16 dst_opt_type;
+
+	dst_opt_type = 0;
+	ovs_match_init(&match, &key, true, NULL);
+	opts_type = ip_tun_from_nlattr(nla_data(attr), &match, false, log);
+	if (opts_type < 0)
+		return opts_type;
+
+	if (key.tun_opts_len) {
+		switch (opts_type) {
+		case OVS_TUNNEL_KEY_ATTR_GENEVE_OPTS:
+			err = validate_geneve_opts(&key);
+			if (err < 0)
+				return err;
+			dst_opt_type = TUNNEL_GENEVE_OPT;
+			break;
+		case OVS_TUNNEL_KEY_ATTR_VXLAN_OPTS:
+			dst_opt_type = TUNNEL_VXLAN_OPT;
+			break;
+		case OVS_TUNNEL_KEY_ATTR_ERSPAN_OPTS:
+			dst_opt_type = TUNNEL_ERSPAN_OPT;
+			break;
+		}
+	}
+
+	start = add_nested_action_start(sfa, OVS_ACTION_ATTR_SET, log);
+	if (start < 0)
+		return start;
+
+	tun_dst = metadata_dst_alloc(key.tun_opts_len, METADATA_IP_TUNNEL,
+				     GFP_KERNEL);
+
+	if (!tun_dst)
+		return -ENOMEM;
+
+	err = dst_cache_init(&tun_dst->u.tun_info.dst_cache, GFP_KERNEL);
+	if (err) {
+		dst_release((struct dst_entry *)tun_dst);
+		return err;
+	}
+
+	a = __add_action(sfa, OVS_KEY_ATTR_TUNNEL_INFO, NULL,
+			 sizeof(*ovs_tun), log);
+	if (IS_ERR(a)) {
+		dst_release((struct dst_entry *)tun_dst);
+		return PTR_ERR(a);
+	}
+
+	ovs_tun = nla_data(a);
+	ovs_tun->tun_dst = tun_dst;
+
+	tun_info = &tun_dst->u.tun_info;
+	tun_info->mode = IP_TUNNEL_INFO_TX;
+	if (key.tun_proto == AF_INET6)
+		tun_info->mode |= IP_TUNNEL_INFO_IPV6;
+	tun_info->key = key.tun_key;
+
+	/* We need to store the options in the action itself since
+	 * everything else will go away after flow setup. We can append
+	 * it to tun_info and then point there.
+	 */
+	ip_tunnel_info_opts_set(tun_info,
+				TUN_METADATA_OPTS(&key, key.tun_opts_len),
+				key.tun_opts_len, dst_opt_type);
+	add_nested_action_end(*sfa, start);
+
+	return err;
+}
+
+static bool validate_nsh(const struct nlattr *attr, bool is_mask,
+			 bool is_push_nsh, bool log)
+{
+	struct sw_flow_match match;
+	struct sw_flow_key key;
+	int ret = 0;
+
+	ovs_match_init(&match, &key, true, NULL);
+	ret = nsh_key_put_from_nlattr(attr, &match, is_mask,
+				      is_push_nsh, log);
+	return !ret;
+}
+
+/* Return false if there are any non-masked bits set.
+ * Mask follows data immediately, before any netlink padding.
+ */
+static bool validate_masked(u8 *data, int len)
+{
+	u8 *mask = data + len;
+
+	while (len--)
+		if (*data++ & ~*mask++)
+			return false;
+
+	return true;
+}
+
+static int validate_set(const struct nlattr *a,
+			const struct sw_flow_key *flow_key,
+			struct sw_flow_actions **sfa, bool *skip_copy,
+			u8 mac_proto, __be16 eth_type, bool masked, bool log)
+{
+	const struct nlattr *ovs_key = nla_data(a);
+	int key_type = nla_type(ovs_key);
+	size_t key_len;
+
+	/* There can be only one key in a action */
+	if (nla_total_size(nla_len(ovs_key)) != nla_len(a))
+		return -EINVAL;
+
+	key_len = nla_len(ovs_key);
+	if (masked)
+		key_len /= 2;
+
+	if (key_type > OVS_KEY_ATTR_MAX ||
+	    !check_attr_len(key_len, ovs_key_lens[key_type].len))
+		return -EINVAL;
+
+	if (masked && !validate_masked(nla_data(ovs_key), key_len))
+		return -EINVAL;
+
+	switch (key_type) {
+	const struct ovs_key_ipv4 *ipv4_key;
+	const struct ovs_key_ipv6 *ipv6_key;
+	int err;
+
+	case OVS_KEY_ATTR_PRIORITY:
+	case OVS_KEY_ATTR_SKB_MARK:
+	case OVS_KEY_ATTR_CT_MARK:
+	case OVS_KEY_ATTR_CT_LABELS:
+		break;
+
+	case OVS_KEY_ATTR_ETHERNET:
+		if (mac_proto != MAC_PROTO_ETHERNET)
+			return -EINVAL;
+		break;
+
+	case OVS_KEY_ATTR_TUNNEL:
+		if (masked)
+			return -EINVAL; /* Masked tunnel set not supported. */
+
+		*skip_copy = true;
+		err = validate_and_copy_set_tun(a, sfa, log);
+		if (err)
+			return err;
+		break;
+
+	case OVS_KEY_ATTR_IPV4:
+		if (eth_type != htons(ETH_P_IP))
+			return -EINVAL;
+
+		ipv4_key = nla_data(ovs_key);
+
+		if (masked) {
+			const struct ovs_key_ipv4 *mask = ipv4_key + 1;
+
+			/* Non-writeable fields. */
+			if (mask->ipv4_proto || mask->ipv4_frag)
+				return -EINVAL;
+		} else {
+			if (ipv4_key->ipv4_proto != flow_key->ip.proto)
+				return -EINVAL;
+
+			if (ipv4_key->ipv4_frag != flow_key->ip.frag)
+				return -EINVAL;
+		}
+		break;
+
+	case OVS_KEY_ATTR_IPV6:
+		if (eth_type != htons(ETH_P_IPV6))
+			return -EINVAL;
+
+		ipv6_key = nla_data(ovs_key);
+
+		if (masked) {
+			const struct ovs_key_ipv6 *mask = ipv6_key + 1;
+
+			/* Non-writeable fields. */
+			if (mask->ipv6_proto || mask->ipv6_frag)
+				return -EINVAL;
+
+			/* Invalid bits in the flow label mask? */
+			if (ntohl(mask->ipv6_label) & 0xFFF00000)
+				return -EINVAL;
+		} else {
+			if (ipv6_key->ipv6_proto != flow_key->ip.proto)
+				return -EINVAL;
+
+			if (ipv6_key->ipv6_frag != flow_key->ip.frag)
+				return -EINVAL;
+		}
+		if (ntohl(ipv6_key->ipv6_label) & 0xFFF00000)
+			return -EINVAL;
+
+		break;
+
+	case OVS_KEY_ATTR_TCP:
+		if ((eth_type != htons(ETH_P_IP) &&
+		     eth_type != htons(ETH_P_IPV6)) ||
+		    flow_key->ip.proto != IPPROTO_TCP)
+			return -EINVAL;
+
+		break;
+
+	case OVS_KEY_ATTR_UDP:
+		if ((eth_type != htons(ETH_P_IP) &&
+		     eth_type != htons(ETH_P_IPV6)) ||
+		    flow_key->ip.proto != IPPROTO_UDP)
+			return -EINVAL;
+
+		break;
+
+	case OVS_KEY_ATTR_MPLS:
+		if (!eth_p_mpls(eth_type))
+			return -EINVAL;
+		break;
+
+	case OVS_KEY_ATTR_SCTP:
+		if ((eth_type != htons(ETH_P_IP) &&
+		     eth_type != htons(ETH_P_IPV6)) ||
+		    flow_key->ip.proto != IPPROTO_SCTP)
+			return -EINVAL;
+
+		break;
+
+	case OVS_KEY_ATTR_NSH:
+		if (eth_type != htons(ETH_P_NSH))
+			return -EINVAL;
+		if (!validate_nsh(nla_data(a), masked, false, log))
+			return -EINVAL;
+		break;
+
+	default:
+		return -EINVAL;
+	}
+
+	/* Convert non-masked non-tunnel set actions to masked set actions. */
+	if (!masked && key_type != OVS_KEY_ATTR_TUNNEL) {
+		int start, len = key_len * 2;
+		struct nlattr *at;
+
+		*skip_copy = true;
+
+		start = add_nested_action_start(sfa,
+						OVS_ACTION_ATTR_SET_TO_MASKED,
+						log);
+		if (start < 0)
+			return start;
+
+		at = __add_action(sfa, key_type, NULL, len, log);
+		if (IS_ERR(at))
+			return PTR_ERR(at);
+
+		memcpy(nla_data(at), nla_data(ovs_key), key_len); /* Key. */
+		memset(nla_data(at) + key_len, 0xff, key_len);    /* Mask. */
+		/* Clear non-writeable bits from otherwise writeable fields. */
+		if (key_type == OVS_KEY_ATTR_IPV6) {
+			struct ovs_key_ipv6 *mask = nla_data(at) + key_len;
+
+			mask->ipv6_label &= htonl(0x000FFFFF);
+		}
+		add_nested_action_end(*sfa, start);
+	}
+
+	return 0;
+}
+
+static int validate_userspace(const struct nlattr *attr)
+{
+	static const struct nla_policy userspace_policy[OVS_USERSPACE_ATTR_MAX + 1] = {
+		[OVS_USERSPACE_ATTR_PID] = {.type = NLA_U32 },
+		[OVS_USERSPACE_ATTR_USERDATA] = {.type = NLA_UNSPEC },
+		[OVS_USERSPACE_ATTR_EGRESS_TUN_PORT] = {.type = NLA_U32 },
+	};
+	struct nlattr *a[OVS_USERSPACE_ATTR_MAX + 1];
+	int error;
+
+	error = nla_parse_nested(a, OVS_USERSPACE_ATTR_MAX, attr,
+				 userspace_policy, NULL);
+	if (error)
+		return error;
+
+	if (!a[OVS_USERSPACE_ATTR_PID] ||
+	    !nla_get_u32(a[OVS_USERSPACE_ATTR_PID]))
+		return -EINVAL;
+
+	return 0;
+}
+
+static int copy_action(const struct nlattr *from,
+		       struct sw_flow_actions **sfa, bool log)
+{
+	int totlen = NLA_ALIGN(from->nla_len);
+	struct nlattr *to;
+
+	to = reserve_sfa_size(sfa, from->nla_len, log);
+	if (IS_ERR(to))
+		return PTR_ERR(to);
+
+	memcpy(to, from, totlen);
+	return 0;
+}
+
+static int __ovs_nla_copy_actions(struct net *net, const struct nlattr *attr,
+				  const struct sw_flow_key *key,
+				  struct sw_flow_actions **sfa,
+				  __be16 eth_type, __be16 vlan_tci, bool log)
+{
+	u8 mac_proto = ovs_key_mac_proto(key);
+	const struct nlattr *a;
+	int rem, err;
+
+	nla_for_each_nested(a, attr, rem) {
+		/* Expected argument lengths, (u32)-1 for variable length. */
+		static const u32 action_lens[OVS_ACTION_ATTR_MAX + 1] = {
+			[OVS_ACTION_ATTR_OUTPUT] = sizeof(u32),
+			[OVS_ACTION_ATTR_RECIRC] = sizeof(u32),
+			[OVS_ACTION_ATTR_USERSPACE] = (u32)-1,
+			[OVS_ACTION_ATTR_PUSH_MPLS] = sizeof(struct ovs_action_push_mpls),
+			[OVS_ACTION_ATTR_POP_MPLS] = sizeof(__be16),
+			[OVS_ACTION_ATTR_PUSH_VLAN] = sizeof(struct ovs_action_push_vlan),
+			[OVS_ACTION_ATTR_POP_VLAN] = 0,
+			[OVS_ACTION_ATTR_SET] = (u32)-1,
+			[OVS_ACTION_ATTR_SET_MASKED] = (u32)-1,
+			[OVS_ACTION_ATTR_SAMPLE] = (u32)-1,
+			[OVS_ACTION_ATTR_HASH] = sizeof(struct ovs_action_hash),
+			[OVS_ACTION_ATTR_CT] = (u32)-1,
+			[OVS_ACTION_ATTR_CT_CLEAR] = 0,
+			[OVS_ACTION_ATTR_TRUNC] = sizeof(struct ovs_action_trunc),
+			[OVS_ACTION_ATTR_PUSH_ETH] = sizeof(struct ovs_action_push_eth),
+			[OVS_ACTION_ATTR_POP_ETH] = 0,
+			[OVS_ACTION_ATTR_PUSH_NSH] = (u32)-1,
+			[OVS_ACTION_ATTR_POP_NSH] = 0,
+			[OVS_ACTION_ATTR_METER] = sizeof(u32),
+			[OVS_ACTION_ATTR_CLONE] = (u32)-1,
+		};
+		const struct ovs_action_push_vlan *vlan;
+		int type = nla_type(a);
+		bool skip_copy;
+
+		if (type > OVS_ACTION_ATTR_MAX ||
+		    (action_lens[type] != nla_len(a) &&
+		     action_lens[type] != (u32)-1))
+			return -EINVAL;
+
+		skip_copy = false;
+		switch (type) {
+		case OVS_ACTION_ATTR_UNSPEC:
+			return -EINVAL;
+
+		case OVS_ACTION_ATTR_USERSPACE:
+			err = validate_userspace(a);
+			if (err)
+				return err;
+			break;
+
+		case OVS_ACTION_ATTR_OUTPUT:
+			if (nla_get_u32(a) >= DP_MAX_PORTS)
+				return -EINVAL;
+			break;
+
+		case OVS_ACTION_ATTR_TRUNC: {
+			const struct ovs_action_trunc *trunc = nla_data(a);
+
+			if (trunc->max_len < ETH_HLEN)
+				return -EINVAL;
+			break;
+		}
+
+		case OVS_ACTION_ATTR_HASH: {
+			const struct ovs_action_hash *act_hash = nla_data(a);
+
+			switch (act_hash->hash_alg) {
+			case OVS_HASH_ALG_L4:
+				break;
+			default:
+				return  -EINVAL;
+			}
+
+			break;
+		}
+
+		case OVS_ACTION_ATTR_POP_VLAN:
+			if (mac_proto != MAC_PROTO_ETHERNET)
+				return -EINVAL;
+			vlan_tci = htons(0);
+			break;
+
+		case OVS_ACTION_ATTR_PUSH_VLAN:
+			if (mac_proto != MAC_PROTO_ETHERNET)
+				return -EINVAL;
+			vlan = nla_data(a);
+			if (!eth_type_vlan(vlan->vlan_tpid))
+				return -EINVAL;
+			if (!(vlan->vlan_tci & htons(VLAN_TAG_PRESENT)))
+				return -EINVAL;
+			vlan_tci = vlan->vlan_tci;
+			break;
+
+		case OVS_ACTION_ATTR_RECIRC:
+			break;
+
+		case OVS_ACTION_ATTR_PUSH_MPLS: {
+			const struct ovs_action_push_mpls *mpls = nla_data(a);
+
+			if (!eth_p_mpls(mpls->mpls_ethertype))
+				return -EINVAL;
+			/* Prohibit push MPLS other than to a white list
+			 * for packets that have a known tag order.
+			 */
+			if (vlan_tci & htons(VLAN_TAG_PRESENT) ||
+			    (eth_type != htons(ETH_P_IP) &&
+			     eth_type != htons(ETH_P_IPV6) &&
+			     eth_type != htons(ETH_P_ARP) &&
+			     eth_type != htons(ETH_P_RARP) &&
+			     !eth_p_mpls(eth_type)))
+				return -EINVAL;
+			eth_type = mpls->mpls_ethertype;
+			break;
+		}
+
+		case OVS_ACTION_ATTR_POP_MPLS:
+			if (vlan_tci & htons(VLAN_TAG_PRESENT) ||
+			    !eth_p_mpls(eth_type))
+				return -EINVAL;
+
+			/* Disallow subsequent L2.5+ set and mpls_pop actions
+			 * as there is no check here to ensure that the new
+			 * eth_type is valid and thus set actions could
+			 * write off the end of the packet or otherwise
+			 * corrupt it.
+			 *
+			 * Support for these actions is planned using packet
+			 * recirculation.
+			 */
+			eth_type = htons(0);
+			break;
+
+		case OVS_ACTION_ATTR_SET:
+			err = validate_set(a, key, sfa,
+					   &skip_copy, mac_proto, eth_type,
+					   false, log);
+			if (err)
+				return err;
+			break;
+
+		case OVS_ACTION_ATTR_SET_MASKED:
+			err = validate_set(a, key, sfa,
+					   &skip_copy, mac_proto, eth_type,
+					   true, log);
+			if (err)
+				return err;
+			break;
+
+		case OVS_ACTION_ATTR_SAMPLE: {
+			bool last = nla_is_last(a, rem);
+
+			err = validate_and_copy_sample(net, a, key, sfa,
+						       eth_type, vlan_tci,
+						       log, last);
+			if (err)
+				return err;
+			skip_copy = true;
+			break;
+		}
+
+		case OVS_ACTION_ATTR_CT:
+			err = ovs_ct_copy_action(net, a, key, sfa, log);
+			if (err)
+				return err;
+			skip_copy = true;
+			break;
+
+		case OVS_ACTION_ATTR_CT_CLEAR:
+			break;
+
+		case OVS_ACTION_ATTR_PUSH_ETH:
+			/* Disallow pushing an Ethernet header if one
+			 * is already present */
+			if (mac_proto != MAC_PROTO_NONE)
+				return -EINVAL;
+			mac_proto = MAC_PROTO_ETHERNET;
+			break;
+
+		case OVS_ACTION_ATTR_POP_ETH:
+			if (mac_proto != MAC_PROTO_ETHERNET)
+				return -EINVAL;
+			if (vlan_tci & htons(VLAN_TAG_PRESENT))
+				return -EINVAL;
+			mac_proto = MAC_PROTO_NONE;
+			break;
+
+		case OVS_ACTION_ATTR_PUSH_NSH:
+			if (mac_proto != MAC_PROTO_ETHERNET) {
+				u8 next_proto;
+
+				next_proto = tun_p_from_eth_p(eth_type);
+				if (!next_proto)
+					return -EINVAL;
+			}
+			mac_proto = MAC_PROTO_NONE;
+			if (!validate_nsh(nla_data(a), false, true, true))
+				return -EINVAL;
+			break;
+
+		case OVS_ACTION_ATTR_POP_NSH: {
+			__be16 inner_proto;
+
+			if (eth_type != htons(ETH_P_NSH))
+				return -EINVAL;
+			inner_proto = tun_p_to_eth_p(key->nsh.base.np);
+			if (!inner_proto)
+				return -EINVAL;
+			if (key->nsh.base.np == TUN_P_ETHERNET)
+				mac_proto = MAC_PROTO_ETHERNET;
+			else
+				mac_proto = MAC_PROTO_NONE;
+			break;
+		}
+
+		case OVS_ACTION_ATTR_METER:
+			/* Non-existent meters are simply ignored.  */
+			break;
+
+		case OVS_ACTION_ATTR_CLONE: {
+			bool last = nla_is_last(a, rem);
+
+			err = validate_and_copy_clone(net, a, key, sfa,
+						      eth_type, vlan_tci,
+						      log, last);
+			if (err)
+				return err;
+			skip_copy = true;
+			break;
+		}
+
+		default:
+			OVS_NLERR(log, "Unknown Action type %d", type);
+			return -EINVAL;
+		}
+		if (!skip_copy) {
+			err = copy_action(a, sfa, log);
+			if (err)
+				return err;
+		}
+	}
+
+	if (rem > 0)
+		return -EINVAL;
+
+	return 0;
+}
+
+/* 'key' must be the masked key. */
+int ovs_nla_copy_actions(struct net *net, const struct nlattr *attr,
+			 const struct sw_flow_key *key,
+			 struct sw_flow_actions **sfa, bool log)
+{
+	int err;
+
+	*sfa = nla_alloc_flow_actions(min(nla_len(attr), MAX_ACTIONS_BUFSIZE));
+	if (IS_ERR(*sfa))
+		return PTR_ERR(*sfa);
+
+	(*sfa)->orig_len = nla_len(attr);
+	err = __ovs_nla_copy_actions(net, attr, key, sfa, key->eth.type,
+				     key->eth.vlan.tci, log);
+	if (err)
+		ovs_nla_free_flow_actions(*sfa);
+
+	return err;
+}
+
+static int sample_action_to_attr(const struct nlattr *attr,
+				 struct sk_buff *skb)
+{
+	struct nlattr *start, *ac_start = NULL, *sample_arg;
+	int err = 0, rem = nla_len(attr);
+	const struct sample_arg *arg;
+	struct nlattr *actions;
+
+	start = nla_nest_start(skb, OVS_ACTION_ATTR_SAMPLE);
+	if (!start)
+		return -EMSGSIZE;
+
+	sample_arg = nla_data(attr);
+	arg = nla_data(sample_arg);
+	actions = nla_next(sample_arg, &rem);
+
+	if (nla_put_u32(skb, OVS_SAMPLE_ATTR_PROBABILITY, arg->probability)) {
+		err = -EMSGSIZE;
+		goto out;
+	}
+
+	ac_start = nla_nest_start(skb, OVS_SAMPLE_ATTR_ACTIONS);
+	if (!ac_start) {
+		err = -EMSGSIZE;
+		goto out;
+	}
+
+	err = ovs_nla_put_actions(actions, rem, skb);
+
+out:
+	if (err) {
+		nla_nest_cancel(skb, ac_start);
+		nla_nest_cancel(skb, start);
+	} else {
+		nla_nest_end(skb, ac_start);
+		nla_nest_end(skb, start);
+	}
+
+	return err;
+}
+
+static int clone_action_to_attr(const struct nlattr *attr,
+				struct sk_buff *skb)
+{
+	struct nlattr *start;
+	int err = 0, rem = nla_len(attr);
+
+	start = nla_nest_start(skb, OVS_ACTION_ATTR_CLONE);
+	if (!start)
+		return -EMSGSIZE;
+
+	/* Skipping the OVS_CLONE_ATTR_EXEC that is always the first attribute. */
+	attr = nla_next(nla_data(attr), &rem);
+	err = ovs_nla_put_actions(attr, rem, skb);
+
+	if (err)
+		nla_nest_cancel(skb, start);
+	else
+		nla_nest_end(skb, start);
+
+	return err;
+}
+
+static int set_action_to_attr(const struct nlattr *a, struct sk_buff *skb)
+{
+	const struct nlattr *ovs_key = nla_data(a);
+	int key_type = nla_type(ovs_key);
+	struct nlattr *start;
+	int err;
+
+	switch (key_type) {
+	case OVS_KEY_ATTR_TUNNEL_INFO: {
+		struct ovs_tunnel_info *ovs_tun = nla_data(ovs_key);
+		struct ip_tunnel_info *tun_info = &ovs_tun->tun_dst->u.tun_info;
+
+		start = nla_nest_start(skb, OVS_ACTION_ATTR_SET);
+		if (!start)
+			return -EMSGSIZE;
+
+		err =  ip_tun_to_nlattr(skb, &tun_info->key,
+					ip_tunnel_info_opts(tun_info),
+					tun_info->options_len,
+					ip_tunnel_info_af(tun_info));
+		if (err)
+			return err;
+		nla_nest_end(skb, start);
+		break;
+	}
+	default:
+		if (nla_put(skb, OVS_ACTION_ATTR_SET, nla_len(a), ovs_key))
+			return -EMSGSIZE;
+		break;
+	}
+
+	return 0;
+}
+
+static int masked_set_action_to_set_action_attr(const struct nlattr *a,
+						struct sk_buff *skb)
+{
+	const struct nlattr *ovs_key = nla_data(a);
+	struct nlattr *nla;
+	size_t key_len = nla_len(ovs_key) / 2;
+
+	/* Revert the conversion we did from a non-masked set action to
+	 * masked set action.
+	 */
+	nla = nla_nest_start(skb, OVS_ACTION_ATTR_SET);
+	if (!nla)
+		return -EMSGSIZE;
+
+	if (nla_put(skb, nla_type(ovs_key), key_len, nla_data(ovs_key)))
+		return -EMSGSIZE;
+
+	nla_nest_end(skb, nla);
+	return 0;
+}
+
+int ovs_nla_put_actions(const struct nlattr *attr, int len, struct sk_buff *skb)
+{
+	const struct nlattr *a;
+	int rem, err;
+
+	nla_for_each_attr(a, attr, len, rem) {
+		int type = nla_type(a);
+
+		switch (type) {
+		case OVS_ACTION_ATTR_SET:
+			err = set_action_to_attr(a, skb);
+			if (err)
+				return err;
+			break;
+
+		case OVS_ACTION_ATTR_SET_TO_MASKED:
+			err = masked_set_action_to_set_action_attr(a, skb);
+			if (err)
+				return err;
+			break;
+
+		case OVS_ACTION_ATTR_SAMPLE:
+			err = sample_action_to_attr(a, skb);
+			if (err)
+				return err;
+			break;
+
+		case OVS_ACTION_ATTR_CT:
+			err = ovs_ct_action_to_attr(nla_data(a), skb);
+			if (err)
+				return err;
+			break;
+
+		case OVS_ACTION_ATTR_CLONE:
+			err = clone_action_to_attr(a, skb);
+			if (err)
+				return err;
+			break;
+
+		default:
+			if (nla_put(skb, type, nla_len(a), nla_data(a)))
+				return -EMSGSIZE;
+			break;
+		}
+	}
+
+	return 0;
+}
diff --git a/net/openvswitch/flow_netlink.h b/net/openvswitch/flow_netlink.h
new file mode 100644
index 000000000..6657606b2
--- /dev/null
+++ b/net/openvswitch/flow_netlink.h
@@ -0,0 +1,87 @@
+/*
+ * Copyright (c) 2007-2013 Nicira, Inc.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of version 2 of the GNU General Public
+ * License as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA
+ */
+
+
+#ifndef FLOW_NETLINK_H
+#define FLOW_NETLINK_H 1
+
+#include <linux/kernel.h>
+#include <linux/netlink.h>
+#include <linux/openvswitch.h>
+#include <linux/spinlock.h>
+#include <linux/types.h>
+#include <linux/rcupdate.h>
+#include <linux/if_ether.h>
+#include <linux/in6.h>
+#include <linux/jiffies.h>
+#include <linux/time.h>
+#include <linux/flex_array.h>
+
+#include <net/inet_ecn.h>
+#include <net/ip_tunnels.h>
+
+#include "flow.h"
+
+size_t ovs_tun_key_attr_size(void);
+size_t ovs_key_attr_size(void);
+
+void ovs_match_init(struct sw_flow_match *match,
+		    struct sw_flow_key *key, bool reset_key,
+		    struct sw_flow_mask *mask);
+
+int ovs_nla_put_key(const struct sw_flow_key *, const struct sw_flow_key *,
+		    int attr, bool is_mask, struct sk_buff *);
+int parse_flow_nlattrs(const struct nlattr *attr, const struct nlattr *a[],
+		       u64 *attrsp, bool log);
+int ovs_nla_get_flow_metadata(struct net *net,
+			      const struct nlattr *a[OVS_KEY_ATTR_MAX + 1],
+			      u64 attrs, struct sw_flow_key *key, bool log);
+
+int ovs_nla_put_identifier(const struct sw_flow *flow, struct sk_buff *skb);
+int ovs_nla_put_masked_key(const struct sw_flow *flow, struct sk_buff *skb);
+int ovs_nla_put_mask(const struct sw_flow *flow, struct sk_buff *skb);
+
+int ovs_nla_get_match(struct net *, struct sw_flow_match *,
+		      const struct nlattr *key, const struct nlattr *mask,
+		      bool log);
+
+int ovs_nla_put_tunnel_info(struct sk_buff *skb,
+			    struct ip_tunnel_info *tun_info);
+
+bool ovs_nla_get_ufid(struct sw_flow_id *, const struct nlattr *, bool log);
+int ovs_nla_get_identifier(struct sw_flow_id *sfid, const struct nlattr *ufid,
+			   const struct sw_flow_key *key, bool log);
+u32 ovs_nla_get_ufid_flags(const struct nlattr *attr);
+
+int ovs_nla_copy_actions(struct net *net, const struct nlattr *attr,
+			 const struct sw_flow_key *key,
+			 struct sw_flow_actions **sfa, bool log);
+int ovs_nla_add_action(struct sw_flow_actions **sfa, int attrtype,
+		       void *data, int len, bool log);
+int ovs_nla_put_actions(const struct nlattr *attr,
+			int len, struct sk_buff *skb);
+
+void ovs_nla_free_flow_actions(struct sw_flow_actions *);
+void ovs_nla_free_flow_actions_rcu(struct sw_flow_actions *);
+
+int nsh_key_from_nlattr(const struct nlattr *attr, struct ovs_key_nsh *nsh,
+			struct ovs_key_nsh *nsh_mask);
+int nsh_hdr_from_nlattr(const struct nlattr *attr, struct nshhdr *nh,
+			size_t size);
+
+#endif /* flow_netlink.h */
diff --git a/net/openvswitch/flow_table.c b/net/openvswitch/flow_table.c
new file mode 100644
index 000000000..80ea2a718
--- /dev/null
+++ b/net/openvswitch/flow_table.c
@@ -0,0 +1,777 @@
+/*
+ * Copyright (c) 2007-2014 Nicira, Inc.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of version 2 of the GNU General Public
+ * License as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA
+ */
+
+#include "flow.h"
+#include "datapath.h"
+#include "flow_netlink.h"
+#include <linux/uaccess.h>
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/if_ether.h>
+#include <linux/if_vlan.h>
+#include <net/llc_pdu.h>
+#include <linux/kernel.h>
+#include <linux/jhash.h>
+#include <linux/jiffies.h>
+#include <linux/llc.h>
+#include <linux/module.h>
+#include <linux/in.h>
+#include <linux/rcupdate.h>
+#include <linux/cpumask.h>
+#include <linux/if_arp.h>
+#include <linux/ip.h>
+#include <linux/ipv6.h>
+#include <linux/sctp.h>
+#include <linux/tcp.h>
+#include <linux/udp.h>
+#include <linux/icmp.h>
+#include <linux/icmpv6.h>
+#include <linux/rculist.h>
+#include <net/ip.h>
+#include <net/ipv6.h>
+#include <net/ndisc.h>
+
+#define TBL_MIN_BUCKETS		1024
+#define REHASH_INTERVAL		(10 * 60 * HZ)
+
+static struct kmem_cache *flow_cache;
+struct kmem_cache *flow_stats_cache __read_mostly;
+
+static u16 range_n_bytes(const struct sw_flow_key_range *range)
+{
+	return range->end - range->start;
+}
+
+void ovs_flow_mask_key(struct sw_flow_key *dst, const struct sw_flow_key *src,
+		       bool full, const struct sw_flow_mask *mask)
+{
+	int start = full ? 0 : mask->range.start;
+	int len = full ? sizeof *dst : range_n_bytes(&mask->range);
+	const long *m = (const long *)((const u8 *)&mask->key + start);
+	const long *s = (const long *)((const u8 *)src + start);
+	long *d = (long *)((u8 *)dst + start);
+	int i;
+
+	/* If 'full' is true then all of 'dst' is fully initialized. Otherwise,
+	 * if 'full' is false the memory outside of the 'mask->range' is left
+	 * uninitialized. This can be used as an optimization when further
+	 * operations on 'dst' only use contents within 'mask->range'.
+	 */
+	for (i = 0; i < len; i += sizeof(long))
+		*d++ = *s++ & *m++;
+}
+
+struct sw_flow *ovs_flow_alloc(void)
+{
+	struct sw_flow *flow;
+	struct flow_stats *stats;
+
+	flow = kmem_cache_zalloc(flow_cache, GFP_KERNEL);
+	if (!flow)
+		return ERR_PTR(-ENOMEM);
+
+	flow->stats_last_writer = -1;
+
+	/* Initialize the default stat node. */
+	stats = kmem_cache_alloc_node(flow_stats_cache,
+				      GFP_KERNEL | __GFP_ZERO,
+				      node_online(0) ? 0 : NUMA_NO_NODE);
+	if (!stats)
+		goto err;
+
+	spin_lock_init(&stats->lock);
+
+	RCU_INIT_POINTER(flow->stats[0], stats);
+
+	cpumask_set_cpu(0, &flow->cpu_used_mask);
+
+	return flow;
+err:
+	kmem_cache_free(flow_cache, flow);
+	return ERR_PTR(-ENOMEM);
+}
+
+int ovs_flow_tbl_count(const struct flow_table *table)
+{
+	return table->count;
+}
+
+static struct flex_array *alloc_buckets(unsigned int n_buckets)
+{
+	struct flex_array *buckets;
+	int i, err;
+
+	buckets = flex_array_alloc(sizeof(struct hlist_head),
+				   n_buckets, GFP_KERNEL);
+	if (!buckets)
+		return NULL;
+
+	err = flex_array_prealloc(buckets, 0, n_buckets, GFP_KERNEL);
+	if (err) {
+		flex_array_free(buckets);
+		return NULL;
+	}
+
+	for (i = 0; i < n_buckets; i++)
+		INIT_HLIST_HEAD((struct hlist_head *)
+					flex_array_get(buckets, i));
+
+	return buckets;
+}
+
+static void flow_free(struct sw_flow *flow)
+{
+	int cpu;
+
+	if (ovs_identifier_is_key(&flow->id))
+		kfree(flow->id.unmasked_key);
+	if (flow->sf_acts)
+		ovs_nla_free_flow_actions((struct sw_flow_actions __force *)flow->sf_acts);
+	/* We open code this to make sure cpu 0 is always considered */
+	for (cpu = 0; cpu < nr_cpu_ids; cpu = cpumask_next(cpu, &flow->cpu_used_mask))
+		if (flow->stats[cpu])
+			kmem_cache_free(flow_stats_cache,
+					(struct flow_stats __force *)flow->stats[cpu]);
+	kmem_cache_free(flow_cache, flow);
+}
+
+static void rcu_free_flow_callback(struct rcu_head *rcu)
+{
+	struct sw_flow *flow = container_of(rcu, struct sw_flow, rcu);
+
+	flow_free(flow);
+}
+
+void ovs_flow_free(struct sw_flow *flow, bool deferred)
+{
+	if (!flow)
+		return;
+
+	if (deferred)
+		call_rcu(&flow->rcu, rcu_free_flow_callback);
+	else
+		flow_free(flow);
+}
+
+static void free_buckets(struct flex_array *buckets)
+{
+	flex_array_free(buckets);
+}
+
+
+static void __table_instance_destroy(struct table_instance *ti)
+{
+	free_buckets(ti->buckets);
+	kfree(ti);
+}
+
+static struct table_instance *table_instance_alloc(int new_size)
+{
+	struct table_instance *ti = kmalloc(sizeof(*ti), GFP_KERNEL);
+
+	if (!ti)
+		return NULL;
+
+	ti->buckets = alloc_buckets(new_size);
+
+	if (!ti->buckets) {
+		kfree(ti);
+		return NULL;
+	}
+	ti->n_buckets = new_size;
+	ti->node_ver = 0;
+	ti->keep_flows = false;
+	get_random_bytes(&ti->hash_seed, sizeof(u32));
+
+	return ti;
+}
+
+int ovs_flow_tbl_init(struct flow_table *table)
+{
+	struct table_instance *ti, *ufid_ti;
+
+	ti = table_instance_alloc(TBL_MIN_BUCKETS);
+
+	if (!ti)
+		return -ENOMEM;
+
+	ufid_ti = table_instance_alloc(TBL_MIN_BUCKETS);
+	if (!ufid_ti)
+		goto free_ti;
+
+	rcu_assign_pointer(table->ti, ti);
+	rcu_assign_pointer(table->ufid_ti, ufid_ti);
+	INIT_LIST_HEAD(&table->mask_list);
+	table->last_rehash = jiffies;
+	table->count = 0;
+	table->ufid_count = 0;
+	return 0;
+
+free_ti:
+	__table_instance_destroy(ti);
+	return -ENOMEM;
+}
+
+static void flow_tbl_destroy_rcu_cb(struct rcu_head *rcu)
+{
+	struct table_instance *ti = container_of(rcu, struct table_instance, rcu);
+
+	__table_instance_destroy(ti);
+}
+
+static void table_instance_destroy(struct table_instance *ti,
+				   struct table_instance *ufid_ti,
+				   bool deferred)
+{
+	int i;
+
+	if (!ti)
+		return;
+
+	BUG_ON(!ufid_ti);
+	if (ti->keep_flows)
+		goto skip_flows;
+
+	for (i = 0; i < ti->n_buckets; i++) {
+		struct sw_flow *flow;
+		struct hlist_head *head = flex_array_get(ti->buckets, i);
+		struct hlist_node *n;
+		int ver = ti->node_ver;
+		int ufid_ver = ufid_ti->node_ver;
+
+		hlist_for_each_entry_safe(flow, n, head, flow_table.node[ver]) {
+			hlist_del_rcu(&flow->flow_table.node[ver]);
+			if (ovs_identifier_is_ufid(&flow->id))
+				hlist_del_rcu(&flow->ufid_table.node[ufid_ver]);
+			ovs_flow_free(flow, deferred);
+		}
+	}
+
+skip_flows:
+	if (deferred) {
+		call_rcu(&ti->rcu, flow_tbl_destroy_rcu_cb);
+		call_rcu(&ufid_ti->rcu, flow_tbl_destroy_rcu_cb);
+	} else {
+		__table_instance_destroy(ti);
+		__table_instance_destroy(ufid_ti);
+	}
+}
+
+/* No need for locking this function is called from RCU callback or
+ * error path.
+ */
+void ovs_flow_tbl_destroy(struct flow_table *table)
+{
+	struct table_instance *ti = rcu_dereference_raw(table->ti);
+	struct table_instance *ufid_ti = rcu_dereference_raw(table->ufid_ti);
+
+	table_instance_destroy(ti, ufid_ti, false);
+}
+
+struct sw_flow *ovs_flow_tbl_dump_next(struct table_instance *ti,
+				       u32 *bucket, u32 *last)
+{
+	struct sw_flow *flow;
+	struct hlist_head *head;
+	int ver;
+	int i;
+
+	ver = ti->node_ver;
+	while (*bucket < ti->n_buckets) {
+		i = 0;
+		head = flex_array_get(ti->buckets, *bucket);
+		hlist_for_each_entry_rcu(flow, head, flow_table.node[ver]) {
+			if (i < *last) {
+				i++;
+				continue;
+			}
+			*last = i + 1;
+			return flow;
+		}
+		(*bucket)++;
+		*last = 0;
+	}
+
+	return NULL;
+}
+
+static struct hlist_head *find_bucket(struct table_instance *ti, u32 hash)
+{
+	hash = jhash_1word(hash, ti->hash_seed);
+	return flex_array_get(ti->buckets,
+				(hash & (ti->n_buckets - 1)));
+}
+
+static void table_instance_insert(struct table_instance *ti,
+				  struct sw_flow *flow)
+{
+	struct hlist_head *head;
+
+	head = find_bucket(ti, flow->flow_table.hash);
+	hlist_add_head_rcu(&flow->flow_table.node[ti->node_ver], head);
+}
+
+static void ufid_table_instance_insert(struct table_instance *ti,
+				       struct sw_flow *flow)
+{
+	struct hlist_head *head;
+
+	head = find_bucket(ti, flow->ufid_table.hash);
+	hlist_add_head_rcu(&flow->ufid_table.node[ti->node_ver], head);
+}
+
+static void flow_table_copy_flows(struct table_instance *old,
+				  struct table_instance *new, bool ufid)
+{
+	int old_ver;
+	int i;
+
+	old_ver = old->node_ver;
+	new->node_ver = !old_ver;
+
+	/* Insert in new table. */
+	for (i = 0; i < old->n_buckets; i++) {
+		struct sw_flow *flow;
+		struct hlist_head *head;
+
+		head = flex_array_get(old->buckets, i);
+
+		if (ufid)
+			hlist_for_each_entry(flow, head,
+					     ufid_table.node[old_ver])
+				ufid_table_instance_insert(new, flow);
+		else
+			hlist_for_each_entry(flow, head,
+					     flow_table.node[old_ver])
+				table_instance_insert(new, flow);
+	}
+
+	old->keep_flows = true;
+}
+
+static struct table_instance *table_instance_rehash(struct table_instance *ti,
+						    int n_buckets, bool ufid)
+{
+	struct table_instance *new_ti;
+
+	new_ti = table_instance_alloc(n_buckets);
+	if (!new_ti)
+		return NULL;
+
+	flow_table_copy_flows(ti, new_ti, ufid);
+
+	return new_ti;
+}
+
+int ovs_flow_tbl_flush(struct flow_table *flow_table)
+{
+	struct table_instance *old_ti, *new_ti;
+	struct table_instance *old_ufid_ti, *new_ufid_ti;
+
+	new_ti = table_instance_alloc(TBL_MIN_BUCKETS);
+	if (!new_ti)
+		return -ENOMEM;
+	new_ufid_ti = table_instance_alloc(TBL_MIN_BUCKETS);
+	if (!new_ufid_ti)
+		goto err_free_ti;
+
+	old_ti = ovsl_dereference(flow_table->ti);
+	old_ufid_ti = ovsl_dereference(flow_table->ufid_ti);
+
+	rcu_assign_pointer(flow_table->ti, new_ti);
+	rcu_assign_pointer(flow_table->ufid_ti, new_ufid_ti);
+	flow_table->last_rehash = jiffies;
+	flow_table->count = 0;
+	flow_table->ufid_count = 0;
+
+	table_instance_destroy(old_ti, old_ufid_ti, true);
+	return 0;
+
+err_free_ti:
+	__table_instance_destroy(new_ti);
+	return -ENOMEM;
+}
+
+static u32 flow_hash(const struct sw_flow_key *key,
+		     const struct sw_flow_key_range *range)
+{
+	int key_start = range->start;
+	int key_end = range->end;
+	const u32 *hash_key = (const u32 *)((const u8 *)key + key_start);
+	int hash_u32s = (key_end - key_start) >> 2;
+
+	/* Make sure number of hash bytes are multiple of u32. */
+	BUILD_BUG_ON(sizeof(long) % sizeof(u32));
+
+	return jhash2(hash_key, hash_u32s, 0);
+}
+
+static int flow_key_start(const struct sw_flow_key *key)
+{
+	if (key->tun_proto)
+		return 0;
+	else
+		return rounddown(offsetof(struct sw_flow_key, phy),
+					  sizeof(long));
+}
+
+static bool cmp_key(const struct sw_flow_key *key1,
+		    const struct sw_flow_key *key2,
+		    int key_start, int key_end)
+{
+	const long *cp1 = (const long *)((const u8 *)key1 + key_start);
+	const long *cp2 = (const long *)((const u8 *)key2 + key_start);
+	long diffs = 0;
+	int i;
+
+	for (i = key_start; i < key_end;  i += sizeof(long))
+		diffs |= *cp1++ ^ *cp2++;
+
+	return diffs == 0;
+}
+
+static bool flow_cmp_masked_key(const struct sw_flow *flow,
+				const struct sw_flow_key *key,
+				const struct sw_flow_key_range *range)
+{
+	return cmp_key(&flow->key, key, range->start, range->end);
+}
+
+static bool ovs_flow_cmp_unmasked_key(const struct sw_flow *flow,
+				      const struct sw_flow_match *match)
+{
+	struct sw_flow_key *key = match->key;
+	int key_start = flow_key_start(key);
+	int key_end = match->range.end;
+
+	BUG_ON(ovs_identifier_is_ufid(&flow->id));
+	return cmp_key(flow->id.unmasked_key, key, key_start, key_end);
+}
+
+static struct sw_flow *masked_flow_lookup(struct table_instance *ti,
+					  const struct sw_flow_key *unmasked,
+					  const struct sw_flow_mask *mask)
+{
+	struct sw_flow *flow;
+	struct hlist_head *head;
+	u32 hash;
+	struct sw_flow_key masked_key;
+
+	ovs_flow_mask_key(&masked_key, unmasked, false, mask);
+	hash = flow_hash(&masked_key, &mask->range);
+	head = find_bucket(ti, hash);
+	hlist_for_each_entry_rcu(flow, head, flow_table.node[ti->node_ver]) {
+		if (flow->mask == mask && flow->flow_table.hash == hash &&
+		    flow_cmp_masked_key(flow, &masked_key, &mask->range))
+			return flow;
+	}
+	return NULL;
+}
+
+struct sw_flow *ovs_flow_tbl_lookup_stats(struct flow_table *tbl,
+				    const struct sw_flow_key *key,
+				    u32 *n_mask_hit)
+{
+	struct table_instance *ti = rcu_dereference_ovsl(tbl->ti);
+	struct sw_flow_mask *mask;
+	struct sw_flow *flow;
+
+	*n_mask_hit = 0;
+	list_for_each_entry_rcu(mask, &tbl->mask_list, list) {
+		(*n_mask_hit)++;
+		flow = masked_flow_lookup(ti, key, mask);
+		if (flow)  /* Found */
+			return flow;
+	}
+	return NULL;
+}
+
+struct sw_flow *ovs_flow_tbl_lookup(struct flow_table *tbl,
+				    const struct sw_flow_key *key)
+{
+	u32 __always_unused n_mask_hit;
+
+	return ovs_flow_tbl_lookup_stats(tbl, key, &n_mask_hit);
+}
+
+struct sw_flow *ovs_flow_tbl_lookup_exact(struct flow_table *tbl,
+					  const struct sw_flow_match *match)
+{
+	struct table_instance *ti = rcu_dereference_ovsl(tbl->ti);
+	struct sw_flow_mask *mask;
+	struct sw_flow *flow;
+
+	/* Always called under ovs-mutex. */
+	list_for_each_entry(mask, &tbl->mask_list, list) {
+		flow = masked_flow_lookup(ti, match->key, mask);
+		if (flow && ovs_identifier_is_key(&flow->id) &&
+		    ovs_flow_cmp_unmasked_key(flow, match))
+			return flow;
+	}
+	return NULL;
+}
+
+static u32 ufid_hash(const struct sw_flow_id *sfid)
+{
+	return jhash(sfid->ufid, sfid->ufid_len, 0);
+}
+
+static bool ovs_flow_cmp_ufid(const struct sw_flow *flow,
+			      const struct sw_flow_id *sfid)
+{
+	if (flow->id.ufid_len != sfid->ufid_len)
+		return false;
+
+	return !memcmp(flow->id.ufid, sfid->ufid, sfid->ufid_len);
+}
+
+bool ovs_flow_cmp(const struct sw_flow *flow, const struct sw_flow_match *match)
+{
+	if (ovs_identifier_is_ufid(&flow->id))
+		return flow_cmp_masked_key(flow, match->key, &match->range);
+
+	return ovs_flow_cmp_unmasked_key(flow, match);
+}
+
+struct sw_flow *ovs_flow_tbl_lookup_ufid(struct flow_table *tbl,
+					 const struct sw_flow_id *ufid)
+{
+	struct table_instance *ti = rcu_dereference_ovsl(tbl->ufid_ti);
+	struct sw_flow *flow;
+	struct hlist_head *head;
+	u32 hash;
+
+	hash = ufid_hash(ufid);
+	head = find_bucket(ti, hash);
+	hlist_for_each_entry_rcu(flow, head, ufid_table.node[ti->node_ver]) {
+		if (flow->ufid_table.hash == hash &&
+		    ovs_flow_cmp_ufid(flow, ufid))
+			return flow;
+	}
+	return NULL;
+}
+
+int ovs_flow_tbl_num_masks(const struct flow_table *table)
+{
+	struct sw_flow_mask *mask;
+	int num = 0;
+
+	list_for_each_entry(mask, &table->mask_list, list)
+		num++;
+
+	return num;
+}
+
+static struct table_instance *table_instance_expand(struct table_instance *ti,
+						    bool ufid)
+{
+	return table_instance_rehash(ti, ti->n_buckets * 2, ufid);
+}
+
+/* Remove 'mask' from the mask list, if it is not needed any more. */
+static void flow_mask_remove(struct flow_table *tbl, struct sw_flow_mask *mask)
+{
+	if (mask) {
+		/* ovs-lock is required to protect mask-refcount and
+		 * mask list.
+		 */
+		ASSERT_OVSL();
+		BUG_ON(!mask->ref_count);
+		mask->ref_count--;
+
+		if (!mask->ref_count) {
+			list_del_rcu(&mask->list);
+			kfree_rcu(mask, rcu);
+		}
+	}
+}
+
+/* Must be called with OVS mutex held. */
+void ovs_flow_tbl_remove(struct flow_table *table, struct sw_flow *flow)
+{
+	struct table_instance *ti = ovsl_dereference(table->ti);
+	struct table_instance *ufid_ti = ovsl_dereference(table->ufid_ti);
+
+	BUG_ON(table->count == 0);
+	hlist_del_rcu(&flow->flow_table.node[ti->node_ver]);
+	table->count--;
+	if (ovs_identifier_is_ufid(&flow->id)) {
+		hlist_del_rcu(&flow->ufid_table.node[ufid_ti->node_ver]);
+		table->ufid_count--;
+	}
+
+	/* RCU delete the mask. 'flow->mask' is not NULLed, as it should be
+	 * accessible as long as the RCU read lock is held.
+	 */
+	flow_mask_remove(table, flow->mask);
+}
+
+static struct sw_flow_mask *mask_alloc(void)
+{
+	struct sw_flow_mask *mask;
+
+	mask = kmalloc(sizeof(*mask), GFP_KERNEL);
+	if (mask)
+		mask->ref_count = 1;
+
+	return mask;
+}
+
+static bool mask_equal(const struct sw_flow_mask *a,
+		       const struct sw_flow_mask *b)
+{
+	const u8 *a_ = (const u8 *)&a->key + a->range.start;
+	const u8 *b_ = (const u8 *)&b->key + b->range.start;
+
+	return  (a->range.end == b->range.end)
+		&& (a->range.start == b->range.start)
+		&& (memcmp(a_, b_, range_n_bytes(&a->range)) == 0);
+}
+
+static struct sw_flow_mask *flow_mask_find(const struct flow_table *tbl,
+					   const struct sw_flow_mask *mask)
+{
+	struct list_head *ml;
+
+	list_for_each(ml, &tbl->mask_list) {
+		struct sw_flow_mask *m;
+		m = container_of(ml, struct sw_flow_mask, list);
+		if (mask_equal(mask, m))
+			return m;
+	}
+
+	return NULL;
+}
+
+/* Add 'mask' into the mask list, if it is not already there. */
+static int flow_mask_insert(struct flow_table *tbl, struct sw_flow *flow,
+			    const struct sw_flow_mask *new)
+{
+	struct sw_flow_mask *mask;
+	mask = flow_mask_find(tbl, new);
+	if (!mask) {
+		/* Allocate a new mask if none exsits. */
+		mask = mask_alloc();
+		if (!mask)
+			return -ENOMEM;
+		mask->key = new->key;
+		mask->range = new->range;
+		list_add_rcu(&mask->list, &tbl->mask_list);
+	} else {
+		BUG_ON(!mask->ref_count);
+		mask->ref_count++;
+	}
+
+	flow->mask = mask;
+	return 0;
+}
+
+/* Must be called with OVS mutex held. */
+static void flow_key_insert(struct flow_table *table, struct sw_flow *flow)
+{
+	struct table_instance *new_ti = NULL;
+	struct table_instance *ti;
+
+	flow->flow_table.hash = flow_hash(&flow->key, &flow->mask->range);
+	ti = ovsl_dereference(table->ti);
+	table_instance_insert(ti, flow);
+	table->count++;
+
+	/* Expand table, if necessary, to make room. */
+	if (table->count > ti->n_buckets)
+		new_ti = table_instance_expand(ti, false);
+	else if (time_after(jiffies, table->last_rehash + REHASH_INTERVAL))
+		new_ti = table_instance_rehash(ti, ti->n_buckets, false);
+
+	if (new_ti) {
+		rcu_assign_pointer(table->ti, new_ti);
+		call_rcu(&ti->rcu, flow_tbl_destroy_rcu_cb);
+		table->last_rehash = jiffies;
+	}
+}
+
+/* Must be called with OVS mutex held. */
+static void flow_ufid_insert(struct flow_table *table, struct sw_flow *flow)
+{
+	struct table_instance *ti;
+
+	flow->ufid_table.hash = ufid_hash(&flow->id);
+	ti = ovsl_dereference(table->ufid_ti);
+	ufid_table_instance_insert(ti, flow);
+	table->ufid_count++;
+
+	/* Expand table, if necessary, to make room. */
+	if (table->ufid_count > ti->n_buckets) {
+		struct table_instance *new_ti;
+
+		new_ti = table_instance_expand(ti, true);
+		if (new_ti) {
+			rcu_assign_pointer(table->ufid_ti, new_ti);
+			call_rcu(&ti->rcu, flow_tbl_destroy_rcu_cb);
+		}
+	}
+}
+
+/* Must be called with OVS mutex held. */
+int ovs_flow_tbl_insert(struct flow_table *table, struct sw_flow *flow,
+			const struct sw_flow_mask *mask)
+{
+	int err;
+
+	err = flow_mask_insert(table, flow, mask);
+	if (err)
+		return err;
+	flow_key_insert(table, flow);
+	if (ovs_identifier_is_ufid(&flow->id))
+		flow_ufid_insert(table, flow);
+
+	return 0;
+}
+
+/* Initializes the flow module.
+ * Returns zero if successful or a negative error code. */
+int ovs_flow_init(void)
+{
+	BUILD_BUG_ON(__alignof__(struct sw_flow_key) % __alignof__(long));
+	BUILD_BUG_ON(sizeof(struct sw_flow_key) % sizeof(long));
+
+	flow_cache = kmem_cache_create("sw_flow", sizeof(struct sw_flow)
+				       + (nr_cpu_ids
+					  * sizeof(struct flow_stats *)),
+				       0, 0, NULL);
+	if (flow_cache == NULL)
+		return -ENOMEM;
+
+	flow_stats_cache
+		= kmem_cache_create("sw_flow_stats", sizeof(struct flow_stats),
+				    0, SLAB_HWCACHE_ALIGN, NULL);
+	if (flow_stats_cache == NULL) {
+		kmem_cache_destroy(flow_cache);
+		flow_cache = NULL;
+		return -ENOMEM;
+	}
+
+	return 0;
+}
+
+/* Uninitializes the flow module. */
+void ovs_flow_exit(void)
+{
+	kmem_cache_destroy(flow_stats_cache);
+	kmem_cache_destroy(flow_cache);
+}
diff --git a/net/openvswitch/flow_table.h b/net/openvswitch/flow_table.h
new file mode 100644
index 000000000..2dd9900f5
--- /dev/null
+++ b/net/openvswitch/flow_table.h
@@ -0,0 +1,90 @@
+/*
+ * Copyright (c) 2007-2013 Nicira, Inc.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of version 2 of the GNU General Public
+ * License as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA
+ */
+
+#ifndef FLOW_TABLE_H
+#define FLOW_TABLE_H 1
+
+#include <linux/kernel.h>
+#include <linux/netlink.h>
+#include <linux/openvswitch.h>
+#include <linux/spinlock.h>
+#include <linux/types.h>
+#include <linux/rcupdate.h>
+#include <linux/if_ether.h>
+#include <linux/in6.h>
+#include <linux/jiffies.h>
+#include <linux/time.h>
+#include <linux/flex_array.h>
+
+#include <net/inet_ecn.h>
+#include <net/ip_tunnels.h>
+
+#include "flow.h"
+
+struct table_instance {
+	struct flex_array *buckets;
+	unsigned int n_buckets;
+	struct rcu_head rcu;
+	int node_ver;
+	u32 hash_seed;
+	bool keep_flows;
+};
+
+struct flow_table {
+	struct table_instance __rcu *ti;
+	struct table_instance __rcu *ufid_ti;
+	struct list_head mask_list;
+	unsigned long last_rehash;
+	unsigned int count;
+	unsigned int ufid_count;
+};
+
+extern struct kmem_cache *flow_stats_cache;
+
+int ovs_flow_init(void);
+void ovs_flow_exit(void);
+
+struct sw_flow *ovs_flow_alloc(void);
+void ovs_flow_free(struct sw_flow *, bool deferred);
+
+int ovs_flow_tbl_init(struct flow_table *);
+int ovs_flow_tbl_count(const struct flow_table *table);
+void ovs_flow_tbl_destroy(struct flow_table *table);
+int ovs_flow_tbl_flush(struct flow_table *flow_table);
+
+int ovs_flow_tbl_insert(struct flow_table *table, struct sw_flow *flow,
+			const struct sw_flow_mask *mask);
+void ovs_flow_tbl_remove(struct flow_table *table, struct sw_flow *flow);
+int  ovs_flow_tbl_num_masks(const struct flow_table *table);
+struct sw_flow *ovs_flow_tbl_dump_next(struct table_instance *table,
+				       u32 *bucket, u32 *idx);
+struct sw_flow *ovs_flow_tbl_lookup_stats(struct flow_table *,
+				    const struct sw_flow_key *,
+				    u32 *n_mask_hit);
+struct sw_flow *ovs_flow_tbl_lookup(struct flow_table *,
+				    const struct sw_flow_key *);
+struct sw_flow *ovs_flow_tbl_lookup_exact(struct flow_table *tbl,
+					  const struct sw_flow_match *match);
+struct sw_flow *ovs_flow_tbl_lookup_ufid(struct flow_table *,
+					 const struct sw_flow_id *);
+
+bool ovs_flow_cmp(const struct sw_flow *, const struct sw_flow_match *);
+
+void ovs_flow_mask_key(struct sw_flow_key *dst, const struct sw_flow_key *src,
+		       bool full, const struct sw_flow_mask *mask);
+#endif /* flow_table.h */
diff --git a/net/openvswitch/meter.c b/net/openvswitch/meter.c
new file mode 100644
index 000000000..9b0c54f07
--- /dev/null
+++ b/net/openvswitch/meter.c
@@ -0,0 +1,611 @@
+/*
+ * Copyright (c) 2017 Nicira, Inc.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of version 2 of the GNU General Public
+ * License as published by the Free Software Foundation.
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/if.h>
+#include <linux/skbuff.h>
+#include <linux/ip.h>
+#include <linux/kernel.h>
+#include <linux/openvswitch.h>
+#include <linux/netlink.h>
+#include <linux/rculist.h>
+
+#include <net/netlink.h>
+#include <net/genetlink.h>
+
+#include "datapath.h"
+#include "meter.h"
+
+#define METER_HASH_BUCKETS 1024
+
+static const struct nla_policy meter_policy[OVS_METER_ATTR_MAX + 1] = {
+	[OVS_METER_ATTR_ID] = { .type = NLA_U32, },
+	[OVS_METER_ATTR_KBPS] = { .type = NLA_FLAG },
+	[OVS_METER_ATTR_STATS] = { .len = sizeof(struct ovs_flow_stats) },
+	[OVS_METER_ATTR_BANDS] = { .type = NLA_NESTED },
+	[OVS_METER_ATTR_USED] = { .type = NLA_U64 },
+	[OVS_METER_ATTR_CLEAR] = { .type = NLA_FLAG },
+	[OVS_METER_ATTR_MAX_METERS] = { .type = NLA_U32 },
+	[OVS_METER_ATTR_MAX_BANDS] = { .type = NLA_U32 },
+};
+
+static const struct nla_policy band_policy[OVS_BAND_ATTR_MAX + 1] = {
+	[OVS_BAND_ATTR_TYPE] = { .type = NLA_U32, },
+	[OVS_BAND_ATTR_RATE] = { .type = NLA_U32, },
+	[OVS_BAND_ATTR_BURST] = { .type = NLA_U32, },
+	[OVS_BAND_ATTR_STATS] = { .len = sizeof(struct ovs_flow_stats) },
+};
+
+static void ovs_meter_free(struct dp_meter *meter)
+{
+	if (!meter)
+		return;
+
+	kfree_rcu(meter, rcu);
+}
+
+static struct hlist_head *meter_hash_bucket(const struct datapath *dp,
+					    u32 meter_id)
+{
+	return &dp->meters[meter_id & (METER_HASH_BUCKETS - 1)];
+}
+
+/* Call with ovs_mutex or RCU read lock. */
+static struct dp_meter *lookup_meter(const struct datapath *dp,
+				     u32 meter_id)
+{
+	struct dp_meter *meter;
+	struct hlist_head *head;
+
+	head = meter_hash_bucket(dp, meter_id);
+	hlist_for_each_entry_rcu(meter, head, dp_hash_node) {
+		if (meter->id == meter_id)
+			return meter;
+	}
+	return NULL;
+}
+
+static void attach_meter(struct datapath *dp, struct dp_meter *meter)
+{
+	struct hlist_head *head = meter_hash_bucket(dp, meter->id);
+
+	hlist_add_head_rcu(&meter->dp_hash_node, head);
+}
+
+static void detach_meter(struct dp_meter *meter)
+{
+	ASSERT_OVSL();
+	if (meter)
+		hlist_del_rcu(&meter->dp_hash_node);
+}
+
+static struct sk_buff *
+ovs_meter_cmd_reply_start(struct genl_info *info, u8 cmd,
+			  struct ovs_header **ovs_reply_header)
+{
+	struct sk_buff *skb;
+	struct ovs_header *ovs_header = info->userhdr;
+
+	skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
+	if (!skb)
+		return ERR_PTR(-ENOMEM);
+
+	*ovs_reply_header = genlmsg_put(skb, info->snd_portid,
+					info->snd_seq,
+					&dp_meter_genl_family, 0, cmd);
+	if (!*ovs_reply_header) {
+		nlmsg_free(skb);
+		return ERR_PTR(-EMSGSIZE);
+	}
+	(*ovs_reply_header)->dp_ifindex = ovs_header->dp_ifindex;
+
+	return skb;
+}
+
+static int ovs_meter_cmd_reply_stats(struct sk_buff *reply, u32 meter_id,
+				     struct dp_meter *meter)
+{
+	struct nlattr *nla;
+	struct dp_meter_band *band;
+	u16 i;
+
+	if (nla_put_u32(reply, OVS_METER_ATTR_ID, meter_id))
+		goto error;
+
+	if (!meter)
+		return 0;
+
+	if (nla_put(reply, OVS_METER_ATTR_STATS,
+		    sizeof(struct ovs_flow_stats), &meter->stats) ||
+	    nla_put_u64_64bit(reply, OVS_METER_ATTR_USED, meter->used,
+			      OVS_METER_ATTR_PAD))
+		goto error;
+
+	nla = nla_nest_start(reply, OVS_METER_ATTR_BANDS);
+	if (!nla)
+		goto error;
+
+	band = meter->bands;
+
+	for (i = 0; i < meter->n_bands; ++i, ++band) {
+		struct nlattr *band_nla;
+
+		band_nla = nla_nest_start(reply, OVS_BAND_ATTR_UNSPEC);
+		if (!band_nla || nla_put(reply, OVS_BAND_ATTR_STATS,
+					 sizeof(struct ovs_flow_stats),
+					 &band->stats))
+			goto error;
+		nla_nest_end(reply, band_nla);
+	}
+	nla_nest_end(reply, nla);
+
+	return 0;
+error:
+	return -EMSGSIZE;
+}
+
+static int ovs_meter_cmd_features(struct sk_buff *skb, struct genl_info *info)
+{
+	struct sk_buff *reply;
+	struct ovs_header *ovs_reply_header;
+	struct nlattr *nla, *band_nla;
+	int err;
+
+	reply = ovs_meter_cmd_reply_start(info, OVS_METER_CMD_FEATURES,
+					  &ovs_reply_header);
+	if (IS_ERR(reply))
+		return PTR_ERR(reply);
+
+	if (nla_put_u32(reply, OVS_METER_ATTR_MAX_METERS, U32_MAX) ||
+	    nla_put_u32(reply, OVS_METER_ATTR_MAX_BANDS, DP_MAX_BANDS))
+		goto nla_put_failure;
+
+	nla = nla_nest_start(reply, OVS_METER_ATTR_BANDS);
+	if (!nla)
+		goto nla_put_failure;
+
+	band_nla = nla_nest_start(reply, OVS_BAND_ATTR_UNSPEC);
+	if (!band_nla)
+		goto nla_put_failure;
+	/* Currently only DROP band type is supported. */
+	if (nla_put_u32(reply, OVS_BAND_ATTR_TYPE, OVS_METER_BAND_TYPE_DROP))
+		goto nla_put_failure;
+	nla_nest_end(reply, band_nla);
+	nla_nest_end(reply, nla);
+
+	genlmsg_end(reply, ovs_reply_header);
+	return genlmsg_reply(reply, info);
+
+nla_put_failure:
+	nlmsg_free(reply);
+	err = -EMSGSIZE;
+	return err;
+}
+
+static struct dp_meter *dp_meter_create(struct nlattr **a)
+{
+	struct nlattr *nla;
+	int rem;
+	u16 n_bands = 0;
+	struct dp_meter *meter;
+	struct dp_meter_band *band;
+	int err;
+
+	/* Validate attributes, count the bands. */
+	if (!a[OVS_METER_ATTR_BANDS])
+		return ERR_PTR(-EINVAL);
+
+	nla_for_each_nested(nla, a[OVS_METER_ATTR_BANDS], rem)
+		if (++n_bands > DP_MAX_BANDS)
+			return ERR_PTR(-EINVAL);
+
+	/* Allocate and set up the meter before locking anything. */
+	meter = kzalloc(n_bands * sizeof(struct dp_meter_band) +
+			sizeof(*meter), GFP_KERNEL);
+	if (!meter)
+		return ERR_PTR(-ENOMEM);
+
+	meter->id = nla_get_u32(a[OVS_METER_ATTR_ID]);
+	meter->used = div_u64(ktime_get_ns(), 1000 * 1000);
+	meter->kbps = a[OVS_METER_ATTR_KBPS] ? 1 : 0;
+	meter->keep_stats = !a[OVS_METER_ATTR_CLEAR];
+	spin_lock_init(&meter->lock);
+	if (meter->keep_stats && a[OVS_METER_ATTR_STATS]) {
+		meter->stats = *(struct ovs_flow_stats *)
+			nla_data(a[OVS_METER_ATTR_STATS]);
+	}
+	meter->n_bands = n_bands;
+
+	/* Set up meter bands. */
+	band = meter->bands;
+	nla_for_each_nested(nla, a[OVS_METER_ATTR_BANDS], rem) {
+		struct nlattr *attr[OVS_BAND_ATTR_MAX + 1];
+		u32 band_max_delta_t;
+
+		err = nla_parse((struct nlattr **)&attr, OVS_BAND_ATTR_MAX,
+				nla_data(nla), nla_len(nla), band_policy,
+				NULL);
+		if (err)
+			goto exit_free_meter;
+
+		if (!attr[OVS_BAND_ATTR_TYPE] ||
+		    !attr[OVS_BAND_ATTR_RATE] ||
+		    !attr[OVS_BAND_ATTR_BURST]) {
+			err = -EINVAL;
+			goto exit_free_meter;
+		}
+
+		band->type = nla_get_u32(attr[OVS_BAND_ATTR_TYPE]);
+		band->rate = nla_get_u32(attr[OVS_BAND_ATTR_RATE]);
+		if (band->rate == 0) {
+			err = -EINVAL;
+			goto exit_free_meter;
+		}
+
+		band->burst_size = nla_get_u32(attr[OVS_BAND_ATTR_BURST]);
+		/* Figure out max delta_t that is enough to fill any bucket.
+		 * Keep max_delta_t size to the bucket units:
+		 * pkts => 1/1000 packets, kilobits => bits.
+		 *
+		 * Start with a full bucket.
+		 */
+		band->bucket = (band->burst_size + band->rate) * 1000ULL;
+		band_max_delta_t = div_u64(band->bucket, band->rate);
+		if (band_max_delta_t > meter->max_delta_t)
+			meter->max_delta_t = band_max_delta_t;
+		band++;
+	}
+
+	return meter;
+
+exit_free_meter:
+	kfree(meter);
+	return ERR_PTR(err);
+}
+
+static int ovs_meter_cmd_set(struct sk_buff *skb, struct genl_info *info)
+{
+	struct nlattr **a = info->attrs;
+	struct dp_meter *meter, *old_meter;
+	struct sk_buff *reply;
+	struct ovs_header *ovs_reply_header;
+	struct ovs_header *ovs_header = info->userhdr;
+	struct datapath *dp;
+	int err;
+	u32 meter_id;
+	bool failed;
+
+	if (!a[OVS_METER_ATTR_ID]) {
+		return -ENODEV;
+	}
+
+	meter = dp_meter_create(a);
+	if (IS_ERR_OR_NULL(meter))
+		return PTR_ERR(meter);
+
+	reply = ovs_meter_cmd_reply_start(info, OVS_METER_CMD_SET,
+					  &ovs_reply_header);
+	if (IS_ERR(reply)) {
+		err = PTR_ERR(reply);
+		goto exit_free_meter;
+	}
+
+	ovs_lock();
+	dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
+	if (!dp) {
+		err = -ENODEV;
+		goto exit_unlock;
+	}
+
+	meter_id = nla_get_u32(a[OVS_METER_ATTR_ID]);
+
+	/* Cannot fail after this. */
+	old_meter = lookup_meter(dp, meter_id);
+	detach_meter(old_meter);
+	attach_meter(dp, meter);
+	ovs_unlock();
+
+	/* Build response with the meter_id and stats from
+	 * the old meter, if any.
+	 */
+	failed = nla_put_u32(reply, OVS_METER_ATTR_ID, meter_id);
+	WARN_ON(failed);
+	if (old_meter) {
+		spin_lock_bh(&old_meter->lock);
+		if (old_meter->keep_stats) {
+			err = ovs_meter_cmd_reply_stats(reply, meter_id,
+							old_meter);
+			WARN_ON(err);
+		}
+		spin_unlock_bh(&old_meter->lock);
+		ovs_meter_free(old_meter);
+	}
+
+	genlmsg_end(reply, ovs_reply_header);
+	return genlmsg_reply(reply, info);
+
+exit_unlock:
+	ovs_unlock();
+	nlmsg_free(reply);
+exit_free_meter:
+	kfree(meter);
+	return err;
+}
+
+static int ovs_meter_cmd_get(struct sk_buff *skb, struct genl_info *info)
+{
+	struct nlattr **a = info->attrs;
+	u32 meter_id;
+	struct ovs_header *ovs_header = info->userhdr;
+	struct ovs_header *ovs_reply_header;
+	struct datapath *dp;
+	int err;
+	struct sk_buff *reply;
+	struct dp_meter *meter;
+
+	if (!a[OVS_METER_ATTR_ID])
+		return -EINVAL;
+
+	meter_id = nla_get_u32(a[OVS_METER_ATTR_ID]);
+
+	reply = ovs_meter_cmd_reply_start(info, OVS_METER_CMD_GET,
+					  &ovs_reply_header);
+	if (IS_ERR(reply))
+		return PTR_ERR(reply);
+
+	ovs_lock();
+
+	dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
+	if (!dp) {
+		err = -ENODEV;
+		goto exit_unlock;
+	}
+
+	/* Locate meter, copy stats. */
+	meter = lookup_meter(dp, meter_id);
+	if (!meter) {
+		err = -ENOENT;
+		goto exit_unlock;
+	}
+
+	spin_lock_bh(&meter->lock);
+	err = ovs_meter_cmd_reply_stats(reply, meter_id, meter);
+	spin_unlock_bh(&meter->lock);
+	if (err)
+		goto exit_unlock;
+
+	ovs_unlock();
+
+	genlmsg_end(reply, ovs_reply_header);
+	return genlmsg_reply(reply, info);
+
+exit_unlock:
+	ovs_unlock();
+	nlmsg_free(reply);
+	return err;
+}
+
+static int ovs_meter_cmd_del(struct sk_buff *skb, struct genl_info *info)
+{
+	struct nlattr **a = info->attrs;
+	u32 meter_id;
+	struct ovs_header *ovs_header = info->userhdr;
+	struct ovs_header *ovs_reply_header;
+	struct datapath *dp;
+	int err;
+	struct sk_buff *reply;
+	struct dp_meter *old_meter;
+
+	if (!a[OVS_METER_ATTR_ID])
+		return -EINVAL;
+	meter_id = nla_get_u32(a[OVS_METER_ATTR_ID]);
+
+	reply = ovs_meter_cmd_reply_start(info, OVS_METER_CMD_DEL,
+					  &ovs_reply_header);
+	if (IS_ERR(reply))
+		return PTR_ERR(reply);
+
+	ovs_lock();
+
+	dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
+	if (!dp) {
+		err = -ENODEV;
+		goto exit_unlock;
+	}
+
+	old_meter = lookup_meter(dp, meter_id);
+	if (old_meter) {
+		spin_lock_bh(&old_meter->lock);
+		err = ovs_meter_cmd_reply_stats(reply, meter_id, old_meter);
+		WARN_ON(err);
+		spin_unlock_bh(&old_meter->lock);
+		detach_meter(old_meter);
+	}
+	ovs_unlock();
+	ovs_meter_free(old_meter);
+	genlmsg_end(reply, ovs_reply_header);
+	return genlmsg_reply(reply, info);
+
+exit_unlock:
+	ovs_unlock();
+	nlmsg_free(reply);
+	return err;
+}
+
+/* Meter action execution.
+ *
+ * Return true 'meter_id' drop band is triggered. The 'skb' should be
+ * dropped by the caller'.
+ */
+bool ovs_meter_execute(struct datapath *dp, struct sk_buff *skb,
+		       struct sw_flow_key *key, u32 meter_id)
+{
+	struct dp_meter *meter;
+	struct dp_meter_band *band;
+	long long int now_ms = div_u64(ktime_get_ns(), 1000 * 1000);
+	long long int long_delta_ms;
+	u32 delta_ms;
+	u32 cost;
+	int i, band_exceeded_max = -1;
+	u32 band_exceeded_rate = 0;
+
+	meter = lookup_meter(dp, meter_id);
+	/* Do not drop the packet when there is no meter. */
+	if (!meter)
+		return false;
+
+	/* Lock the meter while using it. */
+	spin_lock(&meter->lock);
+
+	long_delta_ms = (now_ms - meter->used); /* ms */
+	if (long_delta_ms < 0) {
+		/* This condition means that we have several threads fighting
+		 * for a meter lock, and the one who received the packets a
+		 * bit later wins. Assuming that all racing threads received
+		 * packets at the same time to avoid overflow.
+		 */
+		long_delta_ms = 0;
+	}
+
+	/* Make sure delta_ms will not be too large, so that bucket will not
+	 * wrap around below.
+	 */
+	delta_ms = (long_delta_ms > (long long int)meter->max_delta_t)
+		   ? meter->max_delta_t : (u32)long_delta_ms;
+
+	/* Update meter statistics.
+	 */
+	meter->used = now_ms;
+	meter->stats.n_packets += 1;
+	meter->stats.n_bytes += skb->len;
+
+	/* Bucket rate is either in kilobits per second, or in packets per
+	 * second.  We maintain the bucket in the units of either bits or
+	 * 1/1000th of a packet, correspondingly.
+	 * Then, when rate is multiplied with milliseconds, we get the
+	 * bucket units:
+	 * msec * kbps = bits, and
+	 * msec * packets/sec = 1/1000 packets.
+	 *
+	 * 'cost' is the number of bucket units in this packet.
+	 */
+	cost = (meter->kbps) ? skb->len * 8 : 1000;
+
+	/* Update all bands and find the one hit with the highest rate. */
+	for (i = 0; i < meter->n_bands; ++i) {
+		long long int max_bucket_size;
+
+		band = &meter->bands[i];
+		max_bucket_size = (band->burst_size + band->rate) * 1000LL;
+
+		band->bucket += delta_ms * band->rate;
+		if (band->bucket > max_bucket_size)
+			band->bucket = max_bucket_size;
+
+		if (band->bucket >= cost) {
+			band->bucket -= cost;
+		} else if (band->rate > band_exceeded_rate) {
+			band_exceeded_rate = band->rate;
+			band_exceeded_max = i;
+		}
+	}
+
+	if (band_exceeded_max >= 0) {
+		/* Update band statistics. */
+		band = &meter->bands[band_exceeded_max];
+		band->stats.n_packets += 1;
+		band->stats.n_bytes += skb->len;
+
+		/* Drop band triggered, let the caller drop the 'skb'.  */
+		if (band->type == OVS_METER_BAND_TYPE_DROP) {
+			spin_unlock(&meter->lock);
+			return true;
+		}
+	}
+
+	spin_unlock(&meter->lock);
+	return false;
+}
+
+static struct genl_ops dp_meter_genl_ops[] = {
+	{ .cmd = OVS_METER_CMD_FEATURES,
+		.flags = 0,		  /* OK for unprivileged users. */
+		.policy = meter_policy,
+		.doit = ovs_meter_cmd_features
+	},
+	{ .cmd = OVS_METER_CMD_SET,
+		.flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN
+					   *  privilege.
+					   */
+		.policy = meter_policy,
+		.doit = ovs_meter_cmd_set,
+	},
+	{ .cmd = OVS_METER_CMD_GET,
+		.flags = 0,		  /* OK for unprivileged users. */
+		.policy = meter_policy,
+		.doit = ovs_meter_cmd_get,
+	},
+	{ .cmd = OVS_METER_CMD_DEL,
+		.flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN
+					   *  privilege.
+					   */
+		.policy = meter_policy,
+		.doit = ovs_meter_cmd_del
+	},
+};
+
+static const struct genl_multicast_group ovs_meter_multicast_group = {
+	.name = OVS_METER_MCGROUP,
+};
+
+struct genl_family dp_meter_genl_family __ro_after_init = {
+	.hdrsize = sizeof(struct ovs_header),
+	.name = OVS_METER_FAMILY,
+	.version = OVS_METER_VERSION,
+	.maxattr = OVS_METER_ATTR_MAX,
+	.netnsok = true,
+	.parallel_ops = true,
+	.ops = dp_meter_genl_ops,
+	.n_ops = ARRAY_SIZE(dp_meter_genl_ops),
+	.mcgrps = &ovs_meter_multicast_group,
+	.n_mcgrps = 1,
+	.module = THIS_MODULE,
+};
+
+int ovs_meters_init(struct datapath *dp)
+{
+	int i;
+
+	dp->meters = kmalloc_array(METER_HASH_BUCKETS,
+				   sizeof(struct hlist_head), GFP_KERNEL);
+
+	if (!dp->meters)
+		return -ENOMEM;
+
+	for (i = 0; i < METER_HASH_BUCKETS; i++)
+		INIT_HLIST_HEAD(&dp->meters[i]);
+
+	return 0;
+}
+
+void ovs_meters_exit(struct datapath *dp)
+{
+	int i;
+
+	for (i = 0; i < METER_HASH_BUCKETS; i++) {
+		struct hlist_head *head = &dp->meters[i];
+		struct dp_meter *meter;
+		struct hlist_node *n;
+
+		hlist_for_each_entry_safe(meter, n, head, dp_hash_node)
+			kfree(meter);
+	}
+
+	kfree(dp->meters);
+}
diff --git a/net/openvswitch/meter.h b/net/openvswitch/meter.h
new file mode 100644
index 000000000..970557ed5
--- /dev/null
+++ b/net/openvswitch/meter.h
@@ -0,0 +1,54 @@
+/*
+ * Copyright (c) 2017 Nicira, Inc.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of version 2 of the GNU General Public
+ * License as published by the Free Software Foundation.
+ */
+
+#ifndef METER_H
+#define METER_H 1
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/netlink.h>
+#include <linux/openvswitch.h>
+#include <linux/genetlink.h>
+#include <linux/skbuff.h>
+
+#include "flow.h"
+struct datapath;
+
+#define DP_MAX_BANDS		1
+
+struct dp_meter_band {
+	u32 type;
+	u32 rate;
+	u32 burst_size;
+	u64 bucket; /* 1/1000 packets, or in bits */
+	struct ovs_flow_stats stats;
+};
+
+struct dp_meter {
+	spinlock_t lock;    /* Per meter lock */
+	struct rcu_head rcu;
+	struct hlist_node dp_hash_node; /*Element in datapath->meters
+					 * hash table.
+					 */
+	u32 id;
+	u16 kbps:1, keep_stats:1;
+	u16 n_bands;
+	u32 max_delta_t;
+	u64 used;
+	struct ovs_flow_stats stats;
+	struct dp_meter_band bands[];
+};
+
+extern struct genl_family dp_meter_genl_family;
+int ovs_meters_init(struct datapath *dp);
+void ovs_meters_exit(struct datapath *dp);
+bool ovs_meter_execute(struct datapath *dp, struct sk_buff *skb,
+		       struct sw_flow_key *key, u32 meter_id);
+
+#endif /* meter.h */
diff --git a/net/openvswitch/vport-geneve.c b/net/openvswitch/vport-geneve.c
new file mode 100644
index 000000000..5aaf3babf
--- /dev/null
+++ b/net/openvswitch/vport-geneve.c
@@ -0,0 +1,144 @@
+/*
+ * Copyright (c) 2014 Nicira, Inc.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/in.h>
+#include <linux/ip.h>
+#include <linux/net.h>
+#include <linux/rculist.h>
+#include <linux/udp.h>
+#include <linux/if_vlan.h>
+#include <linux/module.h>
+
+#include <net/geneve.h>
+#include <net/icmp.h>
+#include <net/ip.h>
+#include <net/route.h>
+#include <net/udp.h>
+#include <net/xfrm.h>
+
+#include "datapath.h"
+#include "vport.h"
+#include "vport-netdev.h"
+
+static struct vport_ops ovs_geneve_vport_ops;
+/**
+ * struct geneve_port - Keeps track of open UDP ports
+ * @dst_port: destination port.
+ */
+struct geneve_port {
+	u16 dst_port;
+};
+
+static inline struct geneve_port *geneve_vport(const struct vport *vport)
+{
+	return vport_priv(vport);
+}
+
+static int geneve_get_options(const struct vport *vport,
+			      struct sk_buff *skb)
+{
+	struct geneve_port *geneve_port = geneve_vport(vport);
+
+	if (nla_put_u16(skb, OVS_TUNNEL_ATTR_DST_PORT, geneve_port->dst_port))
+		return -EMSGSIZE;
+	return 0;
+}
+
+static struct vport *geneve_tnl_create(const struct vport_parms *parms)
+{
+	struct net *net = ovs_dp_get_net(parms->dp);
+	struct nlattr *options = parms->options;
+	struct geneve_port *geneve_port;
+	struct net_device *dev;
+	struct vport *vport;
+	struct nlattr *a;
+	u16 dst_port;
+	int err;
+
+	if (!options) {
+		err = -EINVAL;
+		goto error;
+	}
+
+	a = nla_find_nested(options, OVS_TUNNEL_ATTR_DST_PORT);
+	if (a && nla_len(a) == sizeof(u16)) {
+		dst_port = nla_get_u16(a);
+	} else {
+		/* Require destination port from userspace. */
+		err = -EINVAL;
+		goto error;
+	}
+
+	vport = ovs_vport_alloc(sizeof(struct geneve_port),
+				&ovs_geneve_vport_ops, parms);
+	if (IS_ERR(vport))
+		return vport;
+
+	geneve_port = geneve_vport(vport);
+	geneve_port->dst_port = dst_port;
+
+	rtnl_lock();
+	dev = geneve_dev_create_fb(net, parms->name, NET_NAME_USER, dst_port);
+	if (IS_ERR(dev)) {
+		rtnl_unlock();
+		ovs_vport_free(vport);
+		return ERR_CAST(dev);
+	}
+
+	err = dev_change_flags(dev, dev->flags | IFF_UP);
+	if (err < 0) {
+		rtnl_delete_link(dev);
+		rtnl_unlock();
+		ovs_vport_free(vport);
+		goto error;
+	}
+
+	rtnl_unlock();
+	return vport;
+error:
+	return ERR_PTR(err);
+}
+
+static struct vport *geneve_create(const struct vport_parms *parms)
+{
+	struct vport *vport;
+
+	vport = geneve_tnl_create(parms);
+	if (IS_ERR(vport))
+		return vport;
+
+	return ovs_netdev_link(vport, parms->name);
+}
+
+static struct vport_ops ovs_geneve_vport_ops = {
+	.type		= OVS_VPORT_TYPE_GENEVE,
+	.create		= geneve_create,
+	.destroy	= ovs_netdev_tunnel_destroy,
+	.get_options	= geneve_get_options,
+	.send		= dev_queue_xmit,
+};
+
+static int __init ovs_geneve_tnl_init(void)
+{
+	return ovs_vport_ops_register(&ovs_geneve_vport_ops);
+}
+
+static void __exit ovs_geneve_tnl_exit(void)
+{
+	ovs_vport_ops_unregister(&ovs_geneve_vport_ops);
+}
+
+module_init(ovs_geneve_tnl_init);
+module_exit(ovs_geneve_tnl_exit);
+
+MODULE_DESCRIPTION("OVS: Geneve switching port");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("vport-type-5");
diff --git a/net/openvswitch/vport-gre.c b/net/openvswitch/vport-gre.c
new file mode 100644
index 000000000..0e72d95b0
--- /dev/null
+++ b/net/openvswitch/vport-gre.c
@@ -0,0 +1,116 @@
+/*
+ * Copyright (c) 2007-2014 Nicira, Inc.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of version 2 of the GNU General Public
+ * License as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/if.h>
+#include <linux/skbuff.h>
+#include <linux/ip.h>
+#include <linux/if_tunnel.h>
+#include <linux/if_vlan.h>
+#include <linux/in.h>
+#include <linux/in_route.h>
+#include <linux/inetdevice.h>
+#include <linux/jhash.h>
+#include <linux/list.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/workqueue.h>
+#include <linux/rculist.h>
+#include <net/route.h>
+#include <net/xfrm.h>
+
+#include <net/icmp.h>
+#include <net/ip.h>
+#include <net/ip_tunnels.h>
+#include <net/gre.h>
+#include <net/net_namespace.h>
+#include <net/netns/generic.h>
+#include <net/protocol.h>
+
+#include "datapath.h"
+#include "vport.h"
+#include "vport-netdev.h"
+
+static struct vport_ops ovs_gre_vport_ops;
+
+static struct vport *gre_tnl_create(const struct vport_parms *parms)
+{
+	struct net *net = ovs_dp_get_net(parms->dp);
+	struct net_device *dev;
+	struct vport *vport;
+	int err;
+
+	vport = ovs_vport_alloc(0, &ovs_gre_vport_ops, parms);
+	if (IS_ERR(vport))
+		return vport;
+
+	rtnl_lock();
+	dev = gretap_fb_dev_create(net, parms->name, NET_NAME_USER);
+	if (IS_ERR(dev)) {
+		rtnl_unlock();
+		ovs_vport_free(vport);
+		return ERR_CAST(dev);
+	}
+
+	err = dev_change_flags(dev, dev->flags | IFF_UP);
+	if (err < 0) {
+		rtnl_delete_link(dev);
+		rtnl_unlock();
+		ovs_vport_free(vport);
+		return ERR_PTR(err);
+	}
+
+	rtnl_unlock();
+	return vport;
+}
+
+static struct vport *gre_create(const struct vport_parms *parms)
+{
+	struct vport *vport;
+
+	vport = gre_tnl_create(parms);
+	if (IS_ERR(vport))
+		return vport;
+
+	return ovs_netdev_link(vport, parms->name);
+}
+
+static struct vport_ops ovs_gre_vport_ops = {
+	.type		= OVS_VPORT_TYPE_GRE,
+	.create		= gre_create,
+	.send		= dev_queue_xmit,
+	.destroy	= ovs_netdev_tunnel_destroy,
+};
+
+static int __init ovs_gre_tnl_init(void)
+{
+	return ovs_vport_ops_register(&ovs_gre_vport_ops);
+}
+
+static void __exit ovs_gre_tnl_exit(void)
+{
+	ovs_vport_ops_unregister(&ovs_gre_vport_ops);
+}
+
+module_init(ovs_gre_tnl_init);
+module_exit(ovs_gre_tnl_exit);
+
+MODULE_DESCRIPTION("OVS: GRE switching port");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("vport-type-3");
diff --git a/net/openvswitch/vport-internal_dev.c b/net/openvswitch/vport-internal_dev.c
new file mode 100644
index 000000000..3ebf8ba7c
--- /dev/null
+++ b/net/openvswitch/vport-internal_dev.c
@@ -0,0 +1,306 @@
+/*
+ * Copyright (c) 2007-2012 Nicira, Inc.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of version 2 of the GNU General Public
+ * License as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA
+ */
+
+#include <linux/if_vlan.h>
+#include <linux/kernel.h>
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/ethtool.h>
+#include <linux/skbuff.h>
+
+#include <net/dst.h>
+#include <net/xfrm.h>
+#include <net/rtnetlink.h>
+
+#include "datapath.h"
+#include "vport-internal_dev.h"
+#include "vport-netdev.h"
+
+struct internal_dev {
+	struct vport *vport;
+};
+
+static struct vport_ops ovs_internal_vport_ops;
+
+static struct internal_dev *internal_dev_priv(struct net_device *netdev)
+{
+	return netdev_priv(netdev);
+}
+
+/* Called with rcu_read_lock_bh. */
+static netdev_tx_t
+internal_dev_xmit(struct sk_buff *skb, struct net_device *netdev)
+{
+	int len, err;
+
+	len = skb->len;
+	rcu_read_lock();
+	err = ovs_vport_receive(internal_dev_priv(netdev)->vport, skb, NULL);
+	rcu_read_unlock();
+
+	if (likely(!err)) {
+		struct pcpu_sw_netstats *tstats = this_cpu_ptr(netdev->tstats);
+
+		u64_stats_update_begin(&tstats->syncp);
+		tstats->tx_bytes += len;
+		tstats->tx_packets++;
+		u64_stats_update_end(&tstats->syncp);
+	} else {
+		netdev->stats.tx_errors++;
+	}
+	return NETDEV_TX_OK;
+}
+
+static int internal_dev_open(struct net_device *netdev)
+{
+	netif_start_queue(netdev);
+	return 0;
+}
+
+static int internal_dev_stop(struct net_device *netdev)
+{
+	netif_stop_queue(netdev);
+	return 0;
+}
+
+static void internal_dev_getinfo(struct net_device *netdev,
+				 struct ethtool_drvinfo *info)
+{
+	strlcpy(info->driver, "openvswitch", sizeof(info->driver));
+}
+
+static const struct ethtool_ops internal_dev_ethtool_ops = {
+	.get_drvinfo	= internal_dev_getinfo,
+	.get_link	= ethtool_op_get_link,
+};
+
+static void internal_dev_destructor(struct net_device *dev)
+{
+	struct vport *vport = ovs_internal_dev_get_vport(dev);
+
+	ovs_vport_free(vport);
+}
+
+static void
+internal_get_stats(struct net_device *dev, struct rtnl_link_stats64 *stats)
+{
+	int i;
+
+	memset(stats, 0, sizeof(*stats));
+	stats->rx_errors  = dev->stats.rx_errors;
+	stats->tx_errors  = dev->stats.tx_errors;
+	stats->tx_dropped = dev->stats.tx_dropped;
+	stats->rx_dropped = dev->stats.rx_dropped;
+
+	for_each_possible_cpu(i) {
+		const struct pcpu_sw_netstats *percpu_stats;
+		struct pcpu_sw_netstats local_stats;
+		unsigned int start;
+
+		percpu_stats = per_cpu_ptr(dev->tstats, i);
+
+		do {
+			start = u64_stats_fetch_begin_irq(&percpu_stats->syncp);
+			local_stats = *percpu_stats;
+		} while (u64_stats_fetch_retry_irq(&percpu_stats->syncp, start));
+
+		stats->rx_bytes         += local_stats.rx_bytes;
+		stats->rx_packets       += local_stats.rx_packets;
+		stats->tx_bytes         += local_stats.tx_bytes;
+		stats->tx_packets       += local_stats.tx_packets;
+	}
+}
+
+static const struct net_device_ops internal_dev_netdev_ops = {
+	.ndo_open = internal_dev_open,
+	.ndo_stop = internal_dev_stop,
+	.ndo_start_xmit = internal_dev_xmit,
+	.ndo_set_mac_address = eth_mac_addr,
+	.ndo_get_stats64 = internal_get_stats,
+};
+
+static struct rtnl_link_ops internal_dev_link_ops __read_mostly = {
+	.kind = "openvswitch",
+};
+
+static void do_setup(struct net_device *netdev)
+{
+	ether_setup(netdev);
+
+	netdev->max_mtu = ETH_MAX_MTU;
+
+	netdev->netdev_ops = &internal_dev_netdev_ops;
+
+	netdev->priv_flags &= ~IFF_TX_SKB_SHARING;
+	netdev->priv_flags |= IFF_LIVE_ADDR_CHANGE | IFF_OPENVSWITCH |
+			      IFF_NO_QUEUE;
+	netdev->needs_free_netdev = true;
+	netdev->priv_destructor = NULL;
+	netdev->ethtool_ops = &internal_dev_ethtool_ops;
+	netdev->rtnl_link_ops = &internal_dev_link_ops;
+
+	netdev->features = NETIF_F_LLTX | NETIF_F_SG | NETIF_F_FRAGLIST |
+			   NETIF_F_HIGHDMA | NETIF_F_HW_CSUM |
+			   NETIF_F_GSO_SOFTWARE | NETIF_F_GSO_ENCAP_ALL;
+
+	netdev->vlan_features = netdev->features;
+	netdev->hw_enc_features = netdev->features;
+	netdev->features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX;
+	netdev->hw_features = netdev->features & ~NETIF_F_LLTX;
+
+	eth_hw_addr_random(netdev);
+}
+
+static struct vport *internal_dev_create(const struct vport_parms *parms)
+{
+	struct vport *vport;
+	struct internal_dev *internal_dev;
+	struct net_device *dev;
+	int err;
+
+	vport = ovs_vport_alloc(0, &ovs_internal_vport_ops, parms);
+	if (IS_ERR(vport)) {
+		err = PTR_ERR(vport);
+		goto error;
+	}
+
+	dev = alloc_netdev(sizeof(struct internal_dev),
+			   parms->name, NET_NAME_USER, do_setup);
+	vport->dev = dev;
+	if (!vport->dev) {
+		err = -ENOMEM;
+		goto error_free_vport;
+	}
+	vport->dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
+	if (!vport->dev->tstats) {
+		err = -ENOMEM;
+		goto error_free_netdev;
+	}
+
+	dev_net_set(vport->dev, ovs_dp_get_net(vport->dp));
+	internal_dev = internal_dev_priv(vport->dev);
+	internal_dev->vport = vport;
+
+	/* Restrict bridge port to current netns. */
+	if (vport->port_no == OVSP_LOCAL)
+		vport->dev->features |= NETIF_F_NETNS_LOCAL;
+
+	rtnl_lock();
+	err = register_netdevice(vport->dev);
+	if (err)
+		goto error_unlock;
+	vport->dev->priv_destructor = internal_dev_destructor;
+
+	dev_set_promiscuity(vport->dev, 1);
+	rtnl_unlock();
+	netif_start_queue(vport->dev);
+
+	return vport;
+
+error_unlock:
+	rtnl_unlock();
+	free_percpu(dev->tstats);
+error_free_netdev:
+	free_netdev(dev);
+error_free_vport:
+	ovs_vport_free(vport);
+error:
+	return ERR_PTR(err);
+}
+
+static void internal_dev_destroy(struct vport *vport)
+{
+	netif_stop_queue(vport->dev);
+	rtnl_lock();
+	dev_set_promiscuity(vport->dev, -1);
+
+	/* unregister_netdevice() waits for an RCU grace period. */
+	unregister_netdevice(vport->dev);
+	free_percpu(vport->dev->tstats);
+	rtnl_unlock();
+}
+
+static netdev_tx_t internal_dev_recv(struct sk_buff *skb)
+{
+	struct net_device *netdev = skb->dev;
+	struct pcpu_sw_netstats *stats;
+
+	if (unlikely(!(netdev->flags & IFF_UP))) {
+		kfree_skb(skb);
+		netdev->stats.rx_dropped++;
+		return NETDEV_TX_OK;
+	}
+
+	skb_dst_drop(skb);
+	nf_reset(skb);
+	secpath_reset(skb);
+
+	skb->pkt_type = PACKET_HOST;
+	skb->protocol = eth_type_trans(skb, netdev);
+	skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
+
+	stats = this_cpu_ptr(netdev->tstats);
+	u64_stats_update_begin(&stats->syncp);
+	stats->rx_packets++;
+	stats->rx_bytes += skb->len;
+	u64_stats_update_end(&stats->syncp);
+
+	netif_rx(skb);
+	return NETDEV_TX_OK;
+}
+
+static struct vport_ops ovs_internal_vport_ops = {
+	.type		= OVS_VPORT_TYPE_INTERNAL,
+	.create		= internal_dev_create,
+	.destroy	= internal_dev_destroy,
+	.send		= internal_dev_recv,
+};
+
+int ovs_is_internal_dev(const struct net_device *netdev)
+{
+	return netdev->netdev_ops == &internal_dev_netdev_ops;
+}
+
+struct vport *ovs_internal_dev_get_vport(struct net_device *netdev)
+{
+	if (!ovs_is_internal_dev(netdev))
+		return NULL;
+
+	return internal_dev_priv(netdev)->vport;
+}
+
+int ovs_internal_dev_rtnl_link_register(void)
+{
+	int err;
+
+	err = rtnl_link_register(&internal_dev_link_ops);
+	if (err < 0)
+		return err;
+
+	err = ovs_vport_ops_register(&ovs_internal_vport_ops);
+	if (err < 0)
+		rtnl_link_unregister(&internal_dev_link_ops);
+
+	return err;
+}
+
+void ovs_internal_dev_rtnl_link_unregister(void)
+{
+	ovs_vport_ops_unregister(&ovs_internal_vport_ops);
+	rtnl_link_unregister(&internal_dev_link_ops);
+}
diff --git a/net/openvswitch/vport-internal_dev.h b/net/openvswitch/vport-internal_dev.h
new file mode 100644
index 000000000..1b179a190
--- /dev/null
+++ b/net/openvswitch/vport-internal_dev.h
@@ -0,0 +1,30 @@
+/*
+ * Copyright (c) 2007-2011 Nicira, Inc.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of version 2 of the GNU General Public
+ * License as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA
+ */
+
+#ifndef VPORT_INTERNAL_DEV_H
+#define VPORT_INTERNAL_DEV_H 1
+
+#include "datapath.h"
+#include "vport.h"
+
+int ovs_is_internal_dev(const struct net_device *);
+struct vport *ovs_internal_dev_get_vport(struct net_device *);
+int ovs_internal_dev_rtnl_link_register(void);
+void ovs_internal_dev_rtnl_link_unregister(void);
+
+#endif /* vport-internal_dev.h */
diff --git a/net/openvswitch/vport-netdev.c b/net/openvswitch/vport-netdev.c
new file mode 100644
index 000000000..2e5e7a41d
--- /dev/null
+++ b/net/openvswitch/vport-netdev.c
@@ -0,0 +1,225 @@
+/*
+ * Copyright (c) 2007-2012 Nicira, Inc.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of version 2 of the GNU General Public
+ * License as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/if_arp.h>
+#include <linux/if_bridge.h>
+#include <linux/if_vlan.h>
+#include <linux/kernel.h>
+#include <linux/llc.h>
+#include <linux/rtnetlink.h>
+#include <linux/skbuff.h>
+#include <linux/openvswitch.h>
+#include <linux/export.h>
+
+#include <net/ip_tunnels.h>
+#include <net/rtnetlink.h>
+
+#include "datapath.h"
+#include "vport.h"
+#include "vport-internal_dev.h"
+#include "vport-netdev.h"
+
+static struct vport_ops ovs_netdev_vport_ops;
+
+/* Must be called with rcu_read_lock. */
+static void netdev_port_receive(struct sk_buff *skb)
+{
+	struct vport *vport;
+
+	vport = ovs_netdev_get_vport(skb->dev);
+	if (unlikely(!vport))
+		goto error;
+
+	if (unlikely(skb_warn_if_lro(skb)))
+		goto error;
+
+	/* Make our own copy of the packet.  Otherwise we will mangle the
+	 * packet for anyone who came before us (e.g. tcpdump via AF_PACKET).
+	 */
+	skb = skb_share_check(skb, GFP_ATOMIC);
+	if (unlikely(!skb))
+		return;
+
+	if (skb->dev->type == ARPHRD_ETHER) {
+		skb_push(skb, ETH_HLEN);
+		skb_postpush_rcsum(skb, skb->data, ETH_HLEN);
+	}
+	ovs_vport_receive(vport, skb, skb_tunnel_info(skb));
+	return;
+error:
+	kfree_skb(skb);
+}
+
+/* Called with rcu_read_lock and bottom-halves disabled. */
+static rx_handler_result_t netdev_frame_hook(struct sk_buff **pskb)
+{
+	struct sk_buff *skb = *pskb;
+
+	if (unlikely(skb->pkt_type == PACKET_LOOPBACK))
+		return RX_HANDLER_PASS;
+
+	netdev_port_receive(skb);
+	return RX_HANDLER_CONSUMED;
+}
+
+static struct net_device *get_dpdev(const struct datapath *dp)
+{
+	struct vport *local;
+
+	local = ovs_vport_ovsl(dp, OVSP_LOCAL);
+	BUG_ON(!local);
+	return local->dev;
+}
+
+struct vport *ovs_netdev_link(struct vport *vport, const char *name)
+{
+	int err;
+
+	vport->dev = dev_get_by_name(ovs_dp_get_net(vport->dp), name);
+	if (!vport->dev) {
+		err = -ENODEV;
+		goto error_free_vport;
+	}
+
+	if (vport->dev->flags & IFF_LOOPBACK ||
+	    (vport->dev->type != ARPHRD_ETHER &&
+	     vport->dev->type != ARPHRD_NONE) ||
+	    ovs_is_internal_dev(vport->dev)) {
+		err = -EINVAL;
+		goto error_put;
+	}
+
+	rtnl_lock();
+	err = netdev_master_upper_dev_link(vport->dev,
+					   get_dpdev(vport->dp),
+					   NULL, NULL, NULL);
+	if (err)
+		goto error_unlock;
+
+	err = netdev_rx_handler_register(vport->dev, netdev_frame_hook,
+					 vport);
+	if (err)
+		goto error_master_upper_dev_unlink;
+
+	dev_disable_lro(vport->dev);
+	dev_set_promiscuity(vport->dev, 1);
+	vport->dev->priv_flags |= IFF_OVS_DATAPATH;
+	rtnl_unlock();
+
+	return vport;
+
+error_master_upper_dev_unlink:
+	netdev_upper_dev_unlink(vport->dev, get_dpdev(vport->dp));
+error_unlock:
+	rtnl_unlock();
+error_put:
+	dev_put(vport->dev);
+error_free_vport:
+	ovs_vport_free(vport);
+	return ERR_PTR(err);
+}
+EXPORT_SYMBOL_GPL(ovs_netdev_link);
+
+static struct vport *netdev_create(const struct vport_parms *parms)
+{
+	struct vport *vport;
+
+	vport = ovs_vport_alloc(0, &ovs_netdev_vport_ops, parms);
+	if (IS_ERR(vport))
+		return vport;
+
+	return ovs_netdev_link(vport, parms->name);
+}
+
+static void vport_netdev_free(struct rcu_head *rcu)
+{
+	struct vport *vport = container_of(rcu, struct vport, rcu);
+
+	if (vport->dev)
+		dev_put(vport->dev);
+	ovs_vport_free(vport);
+}
+
+void ovs_netdev_detach_dev(struct vport *vport)
+{
+	ASSERT_RTNL();
+	vport->dev->priv_flags &= ~IFF_OVS_DATAPATH;
+	netdev_rx_handler_unregister(vport->dev);
+	netdev_upper_dev_unlink(vport->dev,
+				netdev_master_upper_dev_get(vport->dev));
+	dev_set_promiscuity(vport->dev, -1);
+}
+
+static void netdev_destroy(struct vport *vport)
+{
+	rtnl_lock();
+	if (vport->dev->priv_flags & IFF_OVS_DATAPATH)
+		ovs_netdev_detach_dev(vport);
+	rtnl_unlock();
+
+	call_rcu(&vport->rcu, vport_netdev_free);
+}
+
+void ovs_netdev_tunnel_destroy(struct vport *vport)
+{
+	rtnl_lock();
+	if (vport->dev->priv_flags & IFF_OVS_DATAPATH)
+		ovs_netdev_detach_dev(vport);
+
+	/* We can be invoked by both explicit vport deletion and
+	 * underlying netdev deregistration; delete the link only
+	 * if it's not already shutting down.
+	 */
+	if (vport->dev->reg_state == NETREG_REGISTERED)
+		rtnl_delete_link(vport->dev);
+	dev_put(vport->dev);
+	vport->dev = NULL;
+	rtnl_unlock();
+
+	call_rcu(&vport->rcu, vport_netdev_free);
+}
+EXPORT_SYMBOL_GPL(ovs_netdev_tunnel_destroy);
+
+/* Returns null if this device is not attached to a datapath. */
+struct vport *ovs_netdev_get_vport(struct net_device *dev)
+{
+	if (likely(dev->priv_flags & IFF_OVS_DATAPATH))
+		return (struct vport *)
+			rcu_dereference_rtnl(dev->rx_handler_data);
+	else
+		return NULL;
+}
+
+static struct vport_ops ovs_netdev_vport_ops = {
+	.type		= OVS_VPORT_TYPE_NETDEV,
+	.create		= netdev_create,
+	.destroy	= netdev_destroy,
+	.send		= dev_queue_xmit,
+};
+
+int __init ovs_netdev_init(void)
+{
+	return ovs_vport_ops_register(&ovs_netdev_vport_ops);
+}
+
+void ovs_netdev_exit(void)
+{
+	ovs_vport_ops_unregister(&ovs_netdev_vport_ops);
+}
diff --git a/net/openvswitch/vport-netdev.h b/net/openvswitch/vport-netdev.h
new file mode 100644
index 000000000..19e29c12a
--- /dev/null
+++ b/net/openvswitch/vport-netdev.h
@@ -0,0 +1,36 @@
+/*
+ * Copyright (c) 2007-2011 Nicira, Inc.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of version 2 of the GNU General Public
+ * License as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA
+ */
+
+#ifndef VPORT_NETDEV_H
+#define VPORT_NETDEV_H 1
+
+#include <linux/netdevice.h>
+#include <linux/rcupdate.h>
+
+#include "vport.h"
+
+struct vport *ovs_netdev_get_vport(struct net_device *dev);
+
+struct vport *ovs_netdev_link(struct vport *vport, const char *name);
+void ovs_netdev_detach_dev(struct vport *);
+
+int __init ovs_netdev_init(void);
+void ovs_netdev_exit(void);
+
+void ovs_netdev_tunnel_destroy(struct vport *vport);
+#endif /* vport_netdev.h */
diff --git a/net/openvswitch/vport-vxlan.c b/net/openvswitch/vport-vxlan.c
new file mode 100644
index 000000000..7e6301b2e
--- /dev/null
+++ b/net/openvswitch/vport-vxlan.c
@@ -0,0 +1,182 @@
+/*
+ * Copyright (c) 2014 Nicira, Inc.
+ * Copyright (c) 2013 Cisco Systems, Inc.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of version 2 of the GNU General Public
+ * License as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA
+ */
+
+#include <linux/kernel.h>
+#include <linux/skbuff.h>
+#include <linux/openvswitch.h>
+#include <linux/module.h>
+#include <net/udp.h>
+#include <net/ip_tunnels.h>
+#include <net/rtnetlink.h>
+#include <net/vxlan.h>
+
+#include "datapath.h"
+#include "vport.h"
+#include "vport-netdev.h"
+
+static struct vport_ops ovs_vxlan_netdev_vport_ops;
+
+static int vxlan_get_options(const struct vport *vport, struct sk_buff *skb)
+{
+	struct vxlan_dev *vxlan = netdev_priv(vport->dev);
+	__be16 dst_port = vxlan->cfg.dst_port;
+
+	if (nla_put_u16(skb, OVS_TUNNEL_ATTR_DST_PORT, ntohs(dst_port)))
+		return -EMSGSIZE;
+
+	if (vxlan->cfg.flags & VXLAN_F_GBP) {
+		struct nlattr *exts;
+
+		exts = nla_nest_start(skb, OVS_TUNNEL_ATTR_EXTENSION);
+		if (!exts)
+			return -EMSGSIZE;
+
+		if (vxlan->cfg.flags & VXLAN_F_GBP &&
+		    nla_put_flag(skb, OVS_VXLAN_EXT_GBP))
+			return -EMSGSIZE;
+
+		nla_nest_end(skb, exts);
+	}
+
+	return 0;
+}
+
+static const struct nla_policy exts_policy[OVS_VXLAN_EXT_MAX + 1] = {
+	[OVS_VXLAN_EXT_GBP]	= { .type = NLA_FLAG, },
+};
+
+static int vxlan_configure_exts(struct vport *vport, struct nlattr *attr,
+				struct vxlan_config *conf)
+{
+	struct nlattr *exts[OVS_VXLAN_EXT_MAX + 1];
+	int err;
+
+	if (nla_len(attr) < sizeof(struct nlattr))
+		return -EINVAL;
+
+	err = nla_parse_nested(exts, OVS_VXLAN_EXT_MAX, attr, exts_policy,
+			       NULL);
+	if (err < 0)
+		return err;
+
+	if (exts[OVS_VXLAN_EXT_GBP])
+		conf->flags |= VXLAN_F_GBP;
+
+	return 0;
+}
+
+static struct vport *vxlan_tnl_create(const struct vport_parms *parms)
+{
+	struct net *net = ovs_dp_get_net(parms->dp);
+	struct nlattr *options = parms->options;
+	struct net_device *dev;
+	struct vport *vport;
+	struct nlattr *a;
+	int err;
+	struct vxlan_config conf = {
+		.no_share = true,
+		.flags = VXLAN_F_COLLECT_METADATA | VXLAN_F_UDP_ZERO_CSUM6_RX,
+		/* Don't restrict the packets that can be sent by MTU */
+		.mtu = IP_MAX_MTU,
+	};
+
+	if (!options) {
+		err = -EINVAL;
+		goto error;
+	}
+
+	a = nla_find_nested(options, OVS_TUNNEL_ATTR_DST_PORT);
+	if (a && nla_len(a) == sizeof(u16)) {
+		conf.dst_port = htons(nla_get_u16(a));
+	} else {
+		/* Require destination port from userspace. */
+		err = -EINVAL;
+		goto error;
+	}
+
+	vport = ovs_vport_alloc(0, &ovs_vxlan_netdev_vport_ops, parms);
+	if (IS_ERR(vport))
+		return vport;
+
+	a = nla_find_nested(options, OVS_TUNNEL_ATTR_EXTENSION);
+	if (a) {
+		err = vxlan_configure_exts(vport, a, &conf);
+		if (err) {
+			ovs_vport_free(vport);
+			goto error;
+		}
+	}
+
+	rtnl_lock();
+	dev = vxlan_dev_create(net, parms->name, NET_NAME_USER, &conf);
+	if (IS_ERR(dev)) {
+		rtnl_unlock();
+		ovs_vport_free(vport);
+		return ERR_CAST(dev);
+	}
+
+	err = dev_change_flags(dev, dev->flags | IFF_UP);
+	if (err < 0) {
+		rtnl_delete_link(dev);
+		rtnl_unlock();
+		ovs_vport_free(vport);
+		goto error;
+	}
+
+	rtnl_unlock();
+	return vport;
+error:
+	return ERR_PTR(err);
+}
+
+static struct vport *vxlan_create(const struct vport_parms *parms)
+{
+	struct vport *vport;
+
+	vport = vxlan_tnl_create(parms);
+	if (IS_ERR(vport))
+		return vport;
+
+	return ovs_netdev_link(vport, parms->name);
+}
+
+static struct vport_ops ovs_vxlan_netdev_vport_ops = {
+	.type			= OVS_VPORT_TYPE_VXLAN,
+	.create			= vxlan_create,
+	.destroy		= ovs_netdev_tunnel_destroy,
+	.get_options		= vxlan_get_options,
+	.send			= dev_queue_xmit,
+};
+
+static int __init ovs_vxlan_tnl_init(void)
+{
+	return ovs_vport_ops_register(&ovs_vxlan_netdev_vport_ops);
+}
+
+static void __exit ovs_vxlan_tnl_exit(void)
+{
+	ovs_vport_ops_unregister(&ovs_vxlan_netdev_vport_ops);
+}
+
+module_init(ovs_vxlan_tnl_init);
+module_exit(ovs_vxlan_tnl_exit);
+
+MODULE_DESCRIPTION("OVS: VXLAN switching port");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("vport-type-4");
diff --git a/net/openvswitch/vport.c b/net/openvswitch/vport.c
new file mode 100644
index 000000000..19f676556
--- /dev/null
+++ b/net/openvswitch/vport.c
@@ -0,0 +1,522 @@
+/*
+ * Copyright (c) 2007-2014 Nicira, Inc.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of version 2 of the GNU General Public
+ * License as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA
+ */
+
+#include <linux/etherdevice.h>
+#include <linux/if.h>
+#include <linux/if_vlan.h>
+#include <linux/jhash.h>
+#include <linux/kernel.h>
+#include <linux/list.h>
+#include <linux/mutex.h>
+#include <linux/percpu.h>
+#include <linux/rcupdate.h>
+#include <linux/rtnetlink.h>
+#include <linux/compat.h>
+#include <net/net_namespace.h>
+#include <linux/module.h>
+
+#include "datapath.h"
+#include "vport.h"
+#include "vport-internal_dev.h"
+
+static LIST_HEAD(vport_ops_list);
+
+/* Protected by RCU read lock for reading, ovs_mutex for writing. */
+static struct hlist_head *dev_table;
+#define VPORT_HASH_BUCKETS 1024
+
+/**
+ *	ovs_vport_init - initialize vport subsystem
+ *
+ * Called at module load time to initialize the vport subsystem.
+ */
+int ovs_vport_init(void)
+{
+	dev_table = kcalloc(VPORT_HASH_BUCKETS, sizeof(struct hlist_head),
+			    GFP_KERNEL);
+	if (!dev_table)
+		return -ENOMEM;
+
+	return 0;
+}
+
+/**
+ *	ovs_vport_exit - shutdown vport subsystem
+ *
+ * Called at module exit time to shutdown the vport subsystem.
+ */
+void ovs_vport_exit(void)
+{
+	kfree(dev_table);
+}
+
+static struct hlist_head *hash_bucket(const struct net *net, const char *name)
+{
+	unsigned int hash = jhash(name, strlen(name), (unsigned long) net);
+	return &dev_table[hash & (VPORT_HASH_BUCKETS - 1)];
+}
+
+int __ovs_vport_ops_register(struct vport_ops *ops)
+{
+	int err = -EEXIST;
+	struct vport_ops *o;
+
+	ovs_lock();
+	list_for_each_entry(o, &vport_ops_list, list)
+		if (ops->type == o->type)
+			goto errout;
+
+	list_add_tail(&ops->list, &vport_ops_list);
+	err = 0;
+errout:
+	ovs_unlock();
+	return err;
+}
+EXPORT_SYMBOL_GPL(__ovs_vport_ops_register);
+
+void ovs_vport_ops_unregister(struct vport_ops *ops)
+{
+	ovs_lock();
+	list_del(&ops->list);
+	ovs_unlock();
+}
+EXPORT_SYMBOL_GPL(ovs_vport_ops_unregister);
+
+/**
+ *	ovs_vport_locate - find a port that has already been created
+ *
+ * @name: name of port to find
+ *
+ * Must be called with ovs or RCU read lock.
+ */
+struct vport *ovs_vport_locate(const struct net *net, const char *name)
+{
+	struct hlist_head *bucket = hash_bucket(net, name);
+	struct vport *vport;
+
+	hlist_for_each_entry_rcu(vport, bucket, hash_node)
+		if (!strcmp(name, ovs_vport_name(vport)) &&
+		    net_eq(ovs_dp_get_net(vport->dp), net))
+			return vport;
+
+	return NULL;
+}
+
+/**
+ *	ovs_vport_alloc - allocate and initialize new vport
+ *
+ * @priv_size: Size of private data area to allocate.
+ * @ops: vport device ops
+ *
+ * Allocate and initialize a new vport defined by @ops.  The vport will contain
+ * a private data area of size @priv_size that can be accessed using
+ * vport_priv().  vports that are no longer needed should be released with
+ * vport_free().
+ */
+struct vport *ovs_vport_alloc(int priv_size, const struct vport_ops *ops,
+			  const struct vport_parms *parms)
+{
+	struct vport *vport;
+	size_t alloc_size;
+
+	alloc_size = sizeof(struct vport);
+	if (priv_size) {
+		alloc_size = ALIGN(alloc_size, VPORT_ALIGN);
+		alloc_size += priv_size;
+	}
+
+	vport = kzalloc(alloc_size, GFP_KERNEL);
+	if (!vport)
+		return ERR_PTR(-ENOMEM);
+
+	vport->dp = parms->dp;
+	vport->port_no = parms->port_no;
+	vport->ops = ops;
+	INIT_HLIST_NODE(&vport->dp_hash_node);
+
+	if (ovs_vport_set_upcall_portids(vport, parms->upcall_portids)) {
+		kfree(vport);
+		return ERR_PTR(-EINVAL);
+	}
+
+	return vport;
+}
+EXPORT_SYMBOL_GPL(ovs_vport_alloc);
+
+/**
+ *	ovs_vport_free - uninitialize and free vport
+ *
+ * @vport: vport to free
+ *
+ * Frees a vport allocated with vport_alloc() when it is no longer needed.
+ *
+ * The caller must ensure that an RCU grace period has passed since the last
+ * time @vport was in a datapath.
+ */
+void ovs_vport_free(struct vport *vport)
+{
+	/* vport is freed from RCU callback or error path, Therefore
+	 * it is safe to use raw dereference.
+	 */
+	kfree(rcu_dereference_raw(vport->upcall_portids));
+	kfree(vport);
+}
+EXPORT_SYMBOL_GPL(ovs_vport_free);
+
+static struct vport_ops *ovs_vport_lookup(const struct vport_parms *parms)
+{
+	struct vport_ops *ops;
+
+	list_for_each_entry(ops, &vport_ops_list, list)
+		if (ops->type == parms->type)
+			return ops;
+
+	return NULL;
+}
+
+/**
+ *	ovs_vport_add - add vport device (for kernel callers)
+ *
+ * @parms: Information about new vport.
+ *
+ * Creates a new vport with the specified configuration (which is dependent on
+ * device type).  ovs_mutex must be held.
+ */
+struct vport *ovs_vport_add(const struct vport_parms *parms)
+{
+	struct vport_ops *ops;
+	struct vport *vport;
+
+	ops = ovs_vport_lookup(parms);
+	if (ops) {
+		struct hlist_head *bucket;
+
+		if (!try_module_get(ops->owner))
+			return ERR_PTR(-EAFNOSUPPORT);
+
+		vport = ops->create(parms);
+		if (IS_ERR(vport)) {
+			module_put(ops->owner);
+			return vport;
+		}
+
+		bucket = hash_bucket(ovs_dp_get_net(vport->dp),
+				     ovs_vport_name(vport));
+		hlist_add_head_rcu(&vport->hash_node, bucket);
+		return vport;
+	}
+
+	/* Unlock to attempt module load and return -EAGAIN if load
+	 * was successful as we need to restart the port addition
+	 * workflow.
+	 */
+	ovs_unlock();
+	request_module("vport-type-%d", parms->type);
+	ovs_lock();
+
+	if (!ovs_vport_lookup(parms))
+		return ERR_PTR(-EAFNOSUPPORT);
+	else
+		return ERR_PTR(-EAGAIN);
+}
+
+/**
+ *	ovs_vport_set_options - modify existing vport device (for kernel callers)
+ *
+ * @vport: vport to modify.
+ * @options: New configuration.
+ *
+ * Modifies an existing device with the specified configuration (which is
+ * dependent on device type).  ovs_mutex must be held.
+ */
+int ovs_vport_set_options(struct vport *vport, struct nlattr *options)
+{
+	if (!vport->ops->set_options)
+		return -EOPNOTSUPP;
+	return vport->ops->set_options(vport, options);
+}
+
+/**
+ *	ovs_vport_del - delete existing vport device
+ *
+ * @vport: vport to delete.
+ *
+ * Detaches @vport from its datapath and destroys it.  ovs_mutex must
+ * be held.
+ */
+void ovs_vport_del(struct vport *vport)
+{
+	ASSERT_OVSL();
+
+	hlist_del_rcu(&vport->hash_node);
+	module_put(vport->ops->owner);
+	vport->ops->destroy(vport);
+}
+
+/**
+ *	ovs_vport_get_stats - retrieve device stats
+ *
+ * @vport: vport from which to retrieve the stats
+ * @stats: location to store stats
+ *
+ * Retrieves transmit, receive, and error stats for the given device.
+ *
+ * Must be called with ovs_mutex or rcu_read_lock.
+ */
+void ovs_vport_get_stats(struct vport *vport, struct ovs_vport_stats *stats)
+{
+	const struct rtnl_link_stats64 *dev_stats;
+	struct rtnl_link_stats64 temp;
+
+	dev_stats = dev_get_stats(vport->dev, &temp);
+	stats->rx_errors  = dev_stats->rx_errors;
+	stats->tx_errors  = dev_stats->tx_errors;
+	stats->tx_dropped = dev_stats->tx_dropped;
+	stats->rx_dropped = dev_stats->rx_dropped;
+
+	stats->rx_bytes	  = dev_stats->rx_bytes;
+	stats->rx_packets = dev_stats->rx_packets;
+	stats->tx_bytes	  = dev_stats->tx_bytes;
+	stats->tx_packets = dev_stats->tx_packets;
+}
+
+/**
+ *	ovs_vport_get_options - retrieve device options
+ *
+ * @vport: vport from which to retrieve the options.
+ * @skb: sk_buff where options should be appended.
+ *
+ * Retrieves the configuration of the given device, appending an
+ * %OVS_VPORT_ATTR_OPTIONS attribute that in turn contains nested
+ * vport-specific attributes to @skb.
+ *
+ * Returns 0 if successful, -EMSGSIZE if @skb has insufficient room, or another
+ * negative error code if a real error occurred.  If an error occurs, @skb is
+ * left unmodified.
+ *
+ * Must be called with ovs_mutex or rcu_read_lock.
+ */
+int ovs_vport_get_options(const struct vport *vport, struct sk_buff *skb)
+{
+	struct nlattr *nla;
+	int err;
+
+	if (!vport->ops->get_options)
+		return 0;
+
+	nla = nla_nest_start(skb, OVS_VPORT_ATTR_OPTIONS);
+	if (!nla)
+		return -EMSGSIZE;
+
+	err = vport->ops->get_options(vport, skb);
+	if (err) {
+		nla_nest_cancel(skb, nla);
+		return err;
+	}
+
+	nla_nest_end(skb, nla);
+	return 0;
+}
+
+/**
+ *	ovs_vport_set_upcall_portids - set upcall portids of @vport.
+ *
+ * @vport: vport to modify.
+ * @ids: new configuration, an array of port ids.
+ *
+ * Sets the vport's upcall_portids to @ids.
+ *
+ * Returns 0 if successful, -EINVAL if @ids is zero length or cannot be parsed
+ * as an array of U32.
+ *
+ * Must be called with ovs_mutex.
+ */
+int ovs_vport_set_upcall_portids(struct vport *vport, const struct nlattr *ids)
+{
+	struct vport_portids *old, *vport_portids;
+
+	if (!nla_len(ids) || nla_len(ids) % sizeof(u32))
+		return -EINVAL;
+
+	old = ovsl_dereference(vport->upcall_portids);
+
+	vport_portids = kmalloc(sizeof(*vport_portids) + nla_len(ids),
+				GFP_KERNEL);
+	if (!vport_portids)
+		return -ENOMEM;
+
+	vport_portids->n_ids = nla_len(ids) / sizeof(u32);
+	vport_portids->rn_ids = reciprocal_value(vport_portids->n_ids);
+	nla_memcpy(vport_portids->ids, ids, nla_len(ids));
+
+	rcu_assign_pointer(vport->upcall_portids, vport_portids);
+
+	if (old)
+		kfree_rcu(old, rcu);
+	return 0;
+}
+
+/**
+ *	ovs_vport_get_upcall_portids - get the upcall_portids of @vport.
+ *
+ * @vport: vport from which to retrieve the portids.
+ * @skb: sk_buff where portids should be appended.
+ *
+ * Retrieves the configuration of the given vport, appending the
+ * %OVS_VPORT_ATTR_UPCALL_PID attribute which is the array of upcall
+ * portids to @skb.
+ *
+ * Returns 0 if successful, -EMSGSIZE if @skb has insufficient room.
+ * If an error occurs, @skb is left unmodified.  Must be called with
+ * ovs_mutex or rcu_read_lock.
+ */
+int ovs_vport_get_upcall_portids(const struct vport *vport,
+				 struct sk_buff *skb)
+{
+	struct vport_portids *ids;
+
+	ids = rcu_dereference_ovsl(vport->upcall_portids);
+
+	if (vport->dp->user_features & OVS_DP_F_VPORT_PIDS)
+		return nla_put(skb, OVS_VPORT_ATTR_UPCALL_PID,
+			       ids->n_ids * sizeof(u32), (void *)ids->ids);
+	else
+		return nla_put_u32(skb, OVS_VPORT_ATTR_UPCALL_PID, ids->ids[0]);
+}
+
+/**
+ *	ovs_vport_find_upcall_portid - find the upcall portid to send upcall.
+ *
+ * @vport: vport from which the missed packet is received.
+ * @skb: skb that the missed packet was received.
+ *
+ * Uses the skb_get_hash() to select the upcall portid to send the
+ * upcall.
+ *
+ * Returns the portid of the target socket.  Must be called with rcu_read_lock.
+ */
+u32 ovs_vport_find_upcall_portid(const struct vport *vport, struct sk_buff *skb)
+{
+	struct vport_portids *ids;
+	u32 ids_index;
+	u32 hash;
+
+	ids = rcu_dereference(vport->upcall_portids);
+
+	if (ids->n_ids == 1 && ids->ids[0] == 0)
+		return 0;
+
+	hash = skb_get_hash(skb);
+	ids_index = hash - ids->n_ids * reciprocal_divide(hash, ids->rn_ids);
+	return ids->ids[ids_index];
+}
+
+/**
+ *	ovs_vport_receive - pass up received packet to the datapath for processing
+ *
+ * @vport: vport that received the packet
+ * @skb: skb that was received
+ * @tun_key: tunnel (if any) that carried packet
+ *
+ * Must be called with rcu_read_lock.  The packet cannot be shared and
+ * skb->data should point to the Ethernet header.
+ */
+int ovs_vport_receive(struct vport *vport, struct sk_buff *skb,
+		      const struct ip_tunnel_info *tun_info)
+{
+	struct sw_flow_key key;
+	int error;
+
+	OVS_CB(skb)->input_vport = vport;
+	OVS_CB(skb)->mru = 0;
+	OVS_CB(skb)->cutlen = 0;
+	if (unlikely(dev_net(skb->dev) != ovs_dp_get_net(vport->dp))) {
+		u32 mark;
+
+		mark = skb->mark;
+		skb_scrub_packet(skb, true);
+		skb->mark = mark;
+		tun_info = NULL;
+	}
+
+	/* Extract flow from 'skb' into 'key'. */
+	error = ovs_flow_key_extract(tun_info, skb, &key);
+	if (unlikely(error)) {
+		kfree_skb(skb);
+		return error;
+	}
+	ovs_dp_process_packet(skb, &key);
+	return 0;
+}
+
+static int packet_length(const struct sk_buff *skb,
+			 struct net_device *dev)
+{
+	int length = skb->len - dev->hard_header_len;
+
+	if (!skb_vlan_tag_present(skb) &&
+	    eth_type_vlan(skb->protocol))
+		length -= VLAN_HLEN;
+
+	/* Don't subtract for multiple VLAN tags. Most (all?) drivers allow
+	 * (ETH_LEN + VLAN_HLEN) in addition to the mtu value, but almost none
+	 * account for 802.1ad. e.g. is_skb_forwardable().
+	 */
+
+	return length > 0 ? length : 0;
+}
+
+void ovs_vport_send(struct vport *vport, struct sk_buff *skb, u8 mac_proto)
+{
+	int mtu = vport->dev->mtu;
+
+	switch (vport->dev->type) {
+	case ARPHRD_NONE:
+		if (mac_proto == MAC_PROTO_ETHERNET) {
+			skb_reset_network_header(skb);
+			skb_reset_mac_len(skb);
+			skb->protocol = htons(ETH_P_TEB);
+		} else if (mac_proto != MAC_PROTO_NONE) {
+			WARN_ON_ONCE(1);
+			goto drop;
+		}
+		break;
+	case ARPHRD_ETHER:
+		if (mac_proto != MAC_PROTO_ETHERNET)
+			goto drop;
+		break;
+	default:
+		goto drop;
+	}
+
+	if (unlikely(packet_length(skb, vport->dev) > mtu &&
+		     !skb_is_gso(skb))) {
+		net_warn_ratelimited("%s: dropped over-mtu packet: %d > %d\n",
+				     vport->dev->name,
+				     packet_length(skb, vport->dev), mtu);
+		vport->dev->stats.tx_errors++;
+		goto drop;
+	}
+
+	skb->dev = vport->dev;
+	vport->ops->send(skb);
+	return;
+
+drop:
+	kfree_skb(skb);
+}
diff --git a/net/openvswitch/vport.h b/net/openvswitch/vport.h
new file mode 100644
index 000000000..cda66c26a
--- /dev/null
+++ b/net/openvswitch/vport.h
@@ -0,0 +1,202 @@
+/*
+ * Copyright (c) 2007-2012 Nicira, Inc.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of version 2 of the GNU General Public
+ * License as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA
+ */
+
+#ifndef VPORT_H
+#define VPORT_H 1
+
+#include <linux/if_tunnel.h>
+#include <linux/list.h>
+#include <linux/netlink.h>
+#include <linux/openvswitch.h>
+#include <linux/reciprocal_div.h>
+#include <linux/skbuff.h>
+#include <linux/spinlock.h>
+#include <linux/u64_stats_sync.h>
+
+#include "datapath.h"
+
+struct vport;
+struct vport_parms;
+
+/* The following definitions are for users of the vport subsytem: */
+
+int ovs_vport_init(void);
+void ovs_vport_exit(void);
+
+struct vport *ovs_vport_add(const struct vport_parms *);
+void ovs_vport_del(struct vport *);
+
+struct vport *ovs_vport_locate(const struct net *net, const char *name);
+
+void ovs_vport_get_stats(struct vport *, struct ovs_vport_stats *);
+
+int ovs_vport_set_options(struct vport *, struct nlattr *options);
+int ovs_vport_get_options(const struct vport *, struct sk_buff *);
+
+int ovs_vport_set_upcall_portids(struct vport *, const struct nlattr *pids);
+int ovs_vport_get_upcall_portids(const struct vport *, struct sk_buff *);
+u32 ovs_vport_find_upcall_portid(const struct vport *, struct sk_buff *);
+
+/**
+ * struct vport_portids - array of netlink portids of a vport.
+ *                        must be protected by rcu.
+ * @rn_ids: The reciprocal value of @n_ids.
+ * @rcu: RCU callback head for deferred destruction.
+ * @n_ids: Size of @ids array.
+ * @ids: Array storing the Netlink socket pids to be used for packets received
+ * on this port that miss the flow table.
+ */
+struct vport_portids {
+	struct reciprocal_value rn_ids;
+	struct rcu_head rcu;
+	u32 n_ids;
+	u32 ids[];
+};
+
+/**
+ * struct vport - one port within a datapath
+ * @dev: Pointer to net_device.
+ * @dp: Datapath to which this port belongs.
+ * @upcall_portids: RCU protected 'struct vport_portids'.
+ * @port_no: Index into @dp's @ports array.
+ * @hash_node: Element in @dev_table hash table in vport.c.
+ * @dp_hash_node: Element in @datapath->ports hash table in datapath.c.
+ * @ops: Class structure.
+ * @detach_list: list used for detaching vport in net-exit call.
+ * @rcu: RCU callback head for deferred destruction.
+ */
+struct vport {
+	struct net_device *dev;
+	struct datapath	*dp;
+	struct vport_portids __rcu *upcall_portids;
+	u16 port_no;
+
+	struct hlist_node hash_node;
+	struct hlist_node dp_hash_node;
+	const struct vport_ops *ops;
+
+	struct list_head detach_list;
+	struct rcu_head rcu;
+};
+
+/**
+ * struct vport_parms - parameters for creating a new vport
+ *
+ * @name: New vport's name.
+ * @type: New vport's type.
+ * @options: %OVS_VPORT_ATTR_OPTIONS attribute from Netlink message, %NULL if
+ * none was supplied.
+ * @dp: New vport's datapath.
+ * @port_no: New vport's port number.
+ */
+struct vport_parms {
+	const char *name;
+	enum ovs_vport_type type;
+	struct nlattr *options;
+
+	/* For ovs_vport_alloc(). */
+	struct datapath *dp;
+	u16 port_no;
+	struct nlattr *upcall_portids;
+};
+
+/**
+ * struct vport_ops - definition of a type of virtual port
+ *
+ * @type: %OVS_VPORT_TYPE_* value for this type of virtual port.
+ * @create: Create a new vport configured as specified.  On success returns
+ * a new vport allocated with ovs_vport_alloc(), otherwise an ERR_PTR() value.
+ * @destroy: Destroys a vport.  Must call vport_free() on the vport but not
+ * before an RCU grace period has elapsed.
+ * @set_options: Modify the configuration of an existing vport.  May be %NULL
+ * if modification is not supported.
+ * @get_options: Appends vport-specific attributes for the configuration of an
+ * existing vport to a &struct sk_buff.  May be %NULL for a vport that does not
+ * have any configuration.
+ * @send: Send a packet on the device.
+ * zero for dropped packets or negative for error.
+ */
+struct vport_ops {
+	enum ovs_vport_type type;
+
+	/* Called with ovs_mutex. */
+	struct vport *(*create)(const struct vport_parms *);
+	void (*destroy)(struct vport *);
+
+	int (*set_options)(struct vport *, struct nlattr *);
+	int (*get_options)(const struct vport *, struct sk_buff *);
+
+	netdev_tx_t (*send) (struct sk_buff *skb);
+	struct module *owner;
+	struct list_head list;
+};
+
+struct vport *ovs_vport_alloc(int priv_size, const struct vport_ops *,
+			      const struct vport_parms *);
+void ovs_vport_free(struct vport *);
+
+#define VPORT_ALIGN 8
+
+/**
+ *	vport_priv - access private data area of vport
+ *
+ * @vport: vport to access
+ *
+ * If a nonzero size was passed in priv_size of vport_alloc() a private data
+ * area was allocated on creation.  This allows that area to be accessed and
+ * used for any purpose needed by the vport implementer.
+ */
+static inline void *vport_priv(const struct vport *vport)
+{
+	return (u8 *)(uintptr_t)vport + ALIGN(sizeof(struct vport), VPORT_ALIGN);
+}
+
+/**
+ *	vport_from_priv - lookup vport from private data pointer
+ *
+ * @priv: Start of private data area.
+ *
+ * It is sometimes useful to translate from a pointer to the private data
+ * area to the vport, such as in the case where the private data pointer is
+ * the result of a hash table lookup.  @priv must point to the start of the
+ * private data area.
+ */
+static inline struct vport *vport_from_priv(void *priv)
+{
+	return (struct vport *)((u8 *)priv - ALIGN(sizeof(struct vport), VPORT_ALIGN));
+}
+
+int ovs_vport_receive(struct vport *, struct sk_buff *,
+		      const struct ip_tunnel_info *);
+
+static inline const char *ovs_vport_name(struct vport *vport)
+{
+	return vport->dev->name;
+}
+
+int __ovs_vport_ops_register(struct vport_ops *ops);
+#define ovs_vport_ops_register(ops)		\
+	({					\
+		(ops)->owner = THIS_MODULE;	\
+		__ovs_vport_ops_register(ops);	\
+	})
+
+void ovs_vport_ops_unregister(struct vport_ops *ops);
+void ovs_vport_send(struct vport *vport, struct sk_buff *skb, u8 mac_proto);
+
+#endif /* vport.h */