Adding upstream version 5.10.209.upstream/5.10.209

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

1 files changed, 1621 insertions, 0 deletions

diff --git a/net/openvswitch/actions.c b/net/openvswitch/actions.c
new file mode 100644
index 000000000..80fee9d11
--- /dev/null
+++ b/net/openvswitch/actions.c
@@ -0,0 +1,1621 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2007-2017 Nicira, Inc.
+ */
+
+#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/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 int do_execute_actions(struct datapath *dp, struct sk_buff *skb,
+			      struct sw_flow_key *key,
+			      const struct nlattr *attr, int len);
+
+static int push_mpls(struct sk_buff *skb, struct sw_flow_key *key,
+		     __be32 mpls_lse, __be16 mpls_ethertype, __u16 mac_len)
+{
+	int err;
+
+	err = skb_mpls_push(skb, mpls_lse, mpls_ethertype, mac_len, !!mac_len);
+	if (err)
+		return err;
+
+	if (!mac_len)
+		key->mac_proto = MAC_PROTO_NONE;
+
+	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_mpls_pop(skb, ethertype, skb->mac_len,
+			   ovs_key_mac_proto(key) == MAC_PROTO_ETHERNET);
+	if (err)
+		return err;
+
+	if (ethertype == htons(ETH_P_TEB))
+		key->mac_proto = MAC_PROTO_ETHERNET;
+
+	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;
+
+	if (!pskb_may_pull(skb, skb_network_offset(skb) + MPLS_HLEN))
+		return -ENOMEM;
+
+	stack = mpls_hdr(skb);
+	lse = OVS_MASKED(stack->label_stack_entry, *mpls_lse, *mask);
+	err = skb_mpls_update_lse(skb, lse);
+	if (err)
+		return err;
+
+	flow_key->mpls.lse[0] = 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_CFI_MASK);
+}
+
+/* '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)
+{
+	int err;
+
+	err = skb_eth_pop(skb);
+	if (err)
+		return err;
+
+	/* 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)
+{
+	int err;
+
+	err = skb_eth_push(skb, ethh->addresses.eth_dst,
+			   ethh->addresses.eth_src);
+	if (err)
+		return err;
+
+	/* 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;
+	if (data->vlan_tci & VLAN_CFI_MASK)
+		__vlan_hwaccel_put_tag(skb, data->vlan_proto, data->vlan_tci & ~VLAN_CFI_MASK);
+	else
+		__vlan_hwaccel_clear_tag(skb);
+
+	/* 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;
+	if (skb_vlan_tag_present(skb))
+		data->vlan_tci = skb_vlan_tag_get(skb) | VLAN_CFI_MASK;
+	else
+		data->vlan_tci = 0;
+	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)) {
+		unsigned long orig_dst;
+		struct rt6_info ovs_rt;
+
+		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;
+
+		ipv6_stub->ipv6_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);
+}
+
+static int dec_ttl_exception_handler(struct datapath *dp, struct sk_buff *skb,
+				     struct sw_flow_key *key,
+				     const struct nlattr *attr, bool last)
+{
+	/* The first attribute is always 'OVS_DEC_TTL_ATTR_ACTION'. */
+	struct nlattr *actions = nla_data(attr);
+
+	if (nla_len(actions))
+		return clone_execute(dp, skb, key, 0, nla_data(actions),
+				     nla_len(actions), last, false);
+
+	consume_skb(skb);
+	return 0;
+}
+
+/* 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);
+}
+
+static int execute_check_pkt_len(struct datapath *dp, struct sk_buff *skb,
+				 struct sw_flow_key *key,
+				 const struct nlattr *attr, bool last)
+{
+	struct ovs_skb_cb *ovs_cb = OVS_CB(skb);
+	const struct nlattr *actions, *cpl_arg;
+	int len, max_len, rem = nla_len(attr);
+	const struct check_pkt_len_arg *arg;
+	bool clone_flow_key;
+
+	/* The first netlink attribute in 'attr' is always
+	 * 'OVS_CHECK_PKT_LEN_ATTR_ARG'.
+	 */
+	cpl_arg = nla_data(attr);
+	arg = nla_data(cpl_arg);
+
+	len = ovs_cb->mru ? ovs_cb->mru + skb->mac_len : skb->len;
+	max_len = arg->pkt_len;
+
+	if ((skb_is_gso(skb) && skb_gso_validate_mac_len(skb, max_len)) ||
+	    len <= max_len) {
+		/* Second netlink attribute in 'attr' is always
+		 * 'OVS_CHECK_PKT_LEN_ATTR_ACTIONS_IF_LESS_EQUAL'.
+		 */
+		actions = nla_next(cpl_arg, &rem);
+		clone_flow_key = !arg->exec_for_lesser_equal;
+	} else {
+		/* Third netlink attribute in 'attr' is always
+		 * 'OVS_CHECK_PKT_LEN_ATTR_ACTIONS_IF_GREATER'.
+		 */
+		actions = nla_next(cpl_arg, &rem);
+		actions = nla_next(actions, &rem);
+		clone_flow_key = !arg->exec_for_greater;
+	}
+
+	return clone_execute(dp, skb, key, 0, nla_data(actions),
+			     nla_len(actions), last, clone_flow_key);
+}
+
+static int execute_dec_ttl(struct sk_buff *skb, struct sw_flow_key *key)
+{
+	int err;
+
+	if (skb->protocol == htons(ETH_P_IPV6)) {
+		struct ipv6hdr *nh;
+
+		err = skb_ensure_writable(skb, skb_network_offset(skb) +
+					  sizeof(*nh));
+		if (unlikely(err))
+			return err;
+
+		nh = ipv6_hdr(skb);
+
+		if (nh->hop_limit <= 1)
+			return -EHOSTUNREACH;
+
+		key->ip.ttl = --nh->hop_limit;
+	} else if (skb->protocol == htons(ETH_P_IP)) {
+		struct iphdr *nh;
+		u8 old_ttl;
+
+		err = skb_ensure_writable(skb, skb_network_offset(skb) +
+					  sizeof(*nh));
+		if (unlikely(err))
+			return err;
+
+		nh = ip_hdr(skb);
+		if (nh->ttl <= 1)
+			return -EHOSTUNREACH;
+
+		old_ttl = nh->ttl--;
+		csum_replace2(&nh->check, htons(old_ttl << 8),
+			      htons(nh->ttl << 8));
+		key->ip.ttl = nh->ttl;
+	}
+	return 0;
+}
+
+/* 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: {
+			struct ovs_action_push_mpls *mpls = nla_data(a);
+
+			err = push_mpls(skb, key, mpls->mpls_lse,
+					mpls->mpls_ethertype, skb->mac_len);
+			break;
+		}
+		case OVS_ACTION_ATTR_ADD_MPLS: {
+			struct ovs_action_add_mpls *mpls = nla_data(a);
+			__u16 mac_len = 0;
+
+			if (mpls->tun_flags & OVS_MPLS_L3_TUNNEL_FLAG_MASK)
+				mac_len = skb->mac_len;
+
+			err = push_mpls(skb, key, mpls->mpls_lse,
+					mpls->mpls_ethertype, mac_len);
+			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;
+		}
+
+		case OVS_ACTION_ATTR_CHECK_PKT_LEN: {
+			bool last = nla_is_last(a, rem);
+
+			err = execute_check_pkt_len(dp, skb, key, a, last);
+			if (last)
+				return err;
+
+			break;
+		}
+
+		case OVS_ACTION_ATTR_DEC_TTL:
+			err = execute_dec_ttl(skb, key);
+			if (err == -EHOSTUNREACH) {
+				err = dec_ttl_exception_handler(dp, skb, key,
+								a, true);
+				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);
+}