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 /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
 
 /*
  * 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 _UAPI__LINUX_OPENVSWITCH_H
 #define _UAPI__LINUX_OPENVSWITCH_H 1
 
 #include <linux/types.h>
 #include <linux/if_ether.h>
 
 /**
  * struct ovs_header - header for OVS Generic Netlink messages.
  * @dp_ifindex: ifindex of local port for datapath (0 to make a request not
  * specific to a datapath).
  *
  * Attributes following the header are specific to a particular OVS Generic
  * Netlink family, but all of the OVS families use this header.
  */
 
 struct ovs_header {
     int dp_ifindex;
 };
 
 /* Datapaths. */
 
 #define OVS_DATAPATH_FAMILY  "ovs_datapath"
 #define OVS_DATAPATH_MCGROUP "ovs_datapath"
 
 /* V2:
  *   - API users are expected to provide OVS_DP_ATTR_USER_FEATURES
  *     when creating the datapath.
  */
 #define OVS_DATAPATH_VERSION 2
 
 /* First OVS datapath version to support features */
 #define OVS_DP_VER_FEATURES 2
 
 enum ovs_datapath_cmd {
     OVS_DP_CMD_UNSPEC,
     OVS_DP_CMD_NEW,
     OVS_DP_CMD_DEL,
     OVS_DP_CMD_GET,
     OVS_DP_CMD_SET
 };
 
 /**
  * enum ovs_datapath_attr - attributes for %OVS_DP_* commands.
  * @OVS_DP_ATTR_NAME: Name of the network device that serves as the "local
  * port".  This is the name of the network device whose dp_ifindex is given in
  * the &struct ovs_header.  Always present in notifications.  Required in
  * %OVS_DP_NEW requests.  May be used as an alternative to specifying
  * dp_ifindex in other requests (with a dp_ifindex of 0).
  * @OVS_DP_ATTR_UPCALL_PID: The Netlink socket in userspace that is initially
  * set on the datapath port (for OVS_ACTION_ATTR_MISS).  Only valid on
  * %OVS_DP_CMD_NEW requests. A value of zero indicates that upcalls should
  * not be sent.
  * @OVS_DP_ATTR_PER_CPU_PIDS: Per-cpu array of PIDs for upcalls when
  * OVS_DP_F_DISPATCH_UPCALL_PER_CPU feature is set.
  * @OVS_DP_ATTR_STATS: Statistics about packets that have passed through the
  * datapath.  Always present in notifications.
  * @OVS_DP_ATTR_MEGAFLOW_STATS: Statistics about mega flow masks usage for the
  * datapath. Always present in notifications.
  *
  * These attributes follow the &struct ovs_header within the Generic Netlink
  * payload for %OVS_DP_* commands.
  */
 enum ovs_datapath_attr {
     OVS_DP_ATTR_UNSPEC,
     OVS_DP_ATTR_NAME,       /* name of dp_ifindex netdev */
     OVS_DP_ATTR_UPCALL_PID,     /* Netlink PID to receive upcalls */
     OVS_DP_ATTR_STATS,      /* struct ovs_dp_stats */
     OVS_DP_ATTR_MEGAFLOW_STATS, /* struct ovs_dp_megaflow_stats */
     OVS_DP_ATTR_USER_FEATURES,  /* OVS_DP_F_*  */
     OVS_DP_ATTR_PAD,
     OVS_DP_ATTR_MASKS_CACHE_SIZE,
     OVS_DP_ATTR_PER_CPU_PIDS,   /* Netlink PIDS to receive upcalls in
                      * per-cpu dispatch mode
                      */
     __OVS_DP_ATTR_MAX
 };
 
 #define OVS_DP_ATTR_MAX (__OVS_DP_ATTR_MAX - 1)
 
 struct ovs_dp_stats {
     __u64 n_hit;             /* Number of flow table matches. */
     __u64 n_missed;          /* Number of flow table misses. */
     __u64 n_lost;            /* Number of misses not sent to userspace. */
     __u64 n_flows;           /* Number of flows present */
 };
 
 struct ovs_dp_megaflow_stats {
     __u64 n_mask_hit;    /* Number of masks used for flow lookups. */
     __u32 n_masks;       /* Number of masks for the datapath. */
     __u32 pad0;      /* Pad for future expension. */
     __u64 n_cache_hit;       /* Number of cache matches for flow lookups. */
     __u64 pad1;      /* Pad for future expension. */
 };
 
 struct ovs_vport_stats {
     __u64   rx_packets;     /* total packets received       */
     __u64   tx_packets;     /* total packets transmitted    */
     __u64   rx_bytes;       /* total bytes received         */
     __u64   tx_bytes;       /* total bytes transmitted      */
     __u64   rx_errors;      /* bad packets received         */
     __u64   tx_errors;      /* packet transmit problems     */
     __u64   rx_dropped;     /* no space in linux buffers    */
     __u64   tx_dropped;     /* no space available in linux  */
 };
 
 /* Allow last Netlink attribute to be unaligned */
 #define OVS_DP_F_UNALIGNED  (1 << 0)
 
 /* Allow datapath to associate multiple Netlink PIDs to each vport */
 #define OVS_DP_F_VPORT_PIDS (1 << 1)
 
 /* Allow tc offload recirc sharing */
 #define OVS_DP_F_TC_RECIRC_SHARING  (1 << 2)
 
 /* Allow per-cpu dispatch of upcalls */
 #define OVS_DP_F_DISPATCH_UPCALL_PER_CPU    (1 << 3)
 
 /* Fixed logical ports. */
 #define OVSP_LOCAL      ((__u32)0)
 
 /* Packet transfer. */
 
 #define OVS_PACKET_FAMILY "ovs_packet"
 #define OVS_PACKET_VERSION 0x1
 
 enum ovs_packet_cmd {
     OVS_PACKET_CMD_UNSPEC,
 
     /* Kernel-to-user notifications. */
     OVS_PACKET_CMD_MISS,    /* Flow table miss. */
     OVS_PACKET_CMD_ACTION,  /* OVS_ACTION_ATTR_USERSPACE action. */
 
     /* Userspace commands. */
     OVS_PACKET_CMD_EXECUTE  /* Apply actions to a packet. */
 };
 
 /**
  * enum ovs_packet_attr - attributes for %OVS_PACKET_* commands.
  * @OVS_PACKET_ATTR_PACKET: Present for all notifications.  Contains the entire
  * packet as received, from the start of the Ethernet header onward.  For
  * %OVS_PACKET_CMD_ACTION, %OVS_PACKET_ATTR_PACKET reflects changes made by
  * actions preceding %OVS_ACTION_ATTR_USERSPACE, but %OVS_PACKET_ATTR_KEY is
  * the flow key extracted from the packet as originally received.
  * @OVS_PACKET_ATTR_KEY: Present for all notifications.  Contains the flow key
  * extracted from the packet as nested %OVS_KEY_ATTR_* attributes.  This allows
  * userspace to adapt its flow setup strategy by comparing its notion of the
  * flow key against the kernel's.
  * @OVS_PACKET_ATTR_ACTIONS: Contains actions for the packet.  Used
  * for %OVS_PACKET_CMD_EXECUTE.  It has nested %OVS_ACTION_ATTR_* attributes.
  * Also used in upcall when %OVS_ACTION_ATTR_USERSPACE has optional
  * %OVS_USERSPACE_ATTR_ACTIONS attribute.
  * @OVS_PACKET_ATTR_USERDATA: Present for an %OVS_PACKET_CMD_ACTION
  * notification if the %OVS_ACTION_ATTR_USERSPACE action specified an
  * %OVS_USERSPACE_ATTR_USERDATA attribute, with the same length and content
  * specified there.
  * @OVS_PACKET_ATTR_EGRESS_TUN_KEY: Present for an %OVS_PACKET_CMD_ACTION
  * notification if the %OVS_ACTION_ATTR_USERSPACE action specified an
  * %OVS_USERSPACE_ATTR_EGRESS_TUN_PORT attribute, which is sent only if the
  * output port is actually a tunnel port. Contains the output tunnel key
  * extracted from the packet as nested %OVS_TUNNEL_KEY_ATTR_* attributes.
  * @OVS_PACKET_ATTR_MRU: Present for an %OVS_PACKET_CMD_ACTION and
  * @OVS_PACKET_ATTR_LEN: Packet size before truncation.
  * %OVS_PACKET_ATTR_USERSPACE action specify the Maximum received fragment
  * size.
  * @OVS_PACKET_ATTR_HASH: Packet hash info (e.g. hash, sw_hash and l4_hash in skb).
  *
  * These attributes follow the &struct ovs_header within the Generic Netlink
  * payload for %OVS_PACKET_* commands.
  */
 enum ovs_packet_attr {
     OVS_PACKET_ATTR_UNSPEC,
     OVS_PACKET_ATTR_PACKET,      /* Packet data. */
     OVS_PACKET_ATTR_KEY,         /* Nested OVS_KEY_ATTR_* attributes. */
     OVS_PACKET_ATTR_ACTIONS,     /* Nested OVS_ACTION_ATTR_* attributes. */
     OVS_PACKET_ATTR_USERDATA,    /* OVS_ACTION_ATTR_USERSPACE arg. */
     OVS_PACKET_ATTR_EGRESS_TUN_KEY,  /* Nested OVS_TUNNEL_KEY_ATTR_*
                         attributes. */
     OVS_PACKET_ATTR_UNUSED1,
     OVS_PACKET_ATTR_UNUSED2,
     OVS_PACKET_ATTR_PROBE,      /* Packet operation is a feature probe,
                        error logging should be suppressed. */
     OVS_PACKET_ATTR_MRU,        /* Maximum received IP fragment size. */
     OVS_PACKET_ATTR_LEN,        /* Packet size before truncation. */
     OVS_PACKET_ATTR_HASH,       /* Packet hash. */
     __OVS_PACKET_ATTR_MAX
 };
 
 #define OVS_PACKET_ATTR_MAX (__OVS_PACKET_ATTR_MAX - 1)
 
 /* Virtual ports. */
 
 #define OVS_VPORT_FAMILY  "ovs_vport"
 #define OVS_VPORT_MCGROUP "ovs_vport"
 #define OVS_VPORT_VERSION 0x1
 
 enum ovs_vport_cmd {
     OVS_VPORT_CMD_UNSPEC,
     OVS_VPORT_CMD_NEW,
     OVS_VPORT_CMD_DEL,
     OVS_VPORT_CMD_GET,
     OVS_VPORT_CMD_SET
 };
 
 enum ovs_vport_type {
     OVS_VPORT_TYPE_UNSPEC,
     OVS_VPORT_TYPE_NETDEV,   /* network device */
     OVS_VPORT_TYPE_INTERNAL, /* network device implemented by datapath */
     OVS_VPORT_TYPE_GRE,      /* GRE tunnel. */
     OVS_VPORT_TYPE_VXLAN,    /* VXLAN tunnel. */
     OVS_VPORT_TYPE_GENEVE,   /* Geneve tunnel. */
     __OVS_VPORT_TYPE_MAX
 };
 
 #define OVS_VPORT_TYPE_MAX (__OVS_VPORT_TYPE_MAX - 1)
 
 /**
  * enum ovs_vport_attr - attributes for %OVS_VPORT_* commands.
  * @OVS_VPORT_ATTR_PORT_NO: 32-bit port number within datapath.
  * @OVS_VPORT_ATTR_TYPE: 32-bit %OVS_VPORT_TYPE_* constant describing the type
  * of vport.
  * @OVS_VPORT_ATTR_NAME: Name of vport.  For a vport based on a network device
  * this is the name of the network device.  Maximum length %IFNAMSIZ-1 bytes
  * plus a null terminator.
  * @OVS_VPORT_ATTR_OPTIONS: Vport-specific configuration information.
  * @OVS_VPORT_ATTR_UPCALL_PID: The array of Netlink socket pids in userspace
  * among which OVS_PACKET_CMD_MISS upcalls will be distributed for packets
  * received on this port.  If this is a single-element array of value 0,
  * upcalls should not be sent.
  * @OVS_VPORT_ATTR_STATS: A &struct ovs_vport_stats giving statistics for
  * packets sent or received through the vport.
  *
  * These attributes follow the &struct ovs_header within the Generic Netlink
  * payload for %OVS_VPORT_* commands.
  *
  * For %OVS_VPORT_CMD_NEW requests, the %OVS_VPORT_ATTR_TYPE and
  * %OVS_VPORT_ATTR_NAME attributes are required.  %OVS_VPORT_ATTR_PORT_NO is
  * optional; if not specified a free port number is automatically selected.
  * Whether %OVS_VPORT_ATTR_OPTIONS is required or optional depends on the type
  * of vport.
  *
  * For other requests, if %OVS_VPORT_ATTR_NAME is specified then it is used to
  * look up the vport to operate on; otherwise dp_idx from the &struct
  * ovs_header plus %OVS_VPORT_ATTR_PORT_NO determine the vport.
  */
 enum ovs_vport_attr {
     OVS_VPORT_ATTR_UNSPEC,
     OVS_VPORT_ATTR_PORT_NO, /* u32 port number within datapath */
     OVS_VPORT_ATTR_TYPE,    /* u32 OVS_VPORT_TYPE_* constant. */
     OVS_VPORT_ATTR_NAME,    /* string name, up to IFNAMSIZ bytes long */
     OVS_VPORT_ATTR_OPTIONS, /* nested attributes, varies by vport type */
     OVS_VPORT_ATTR_UPCALL_PID, /* array of u32 Netlink socket PIDs for */
                 /* receiving upcalls */
     OVS_VPORT_ATTR_STATS,   /* struct ovs_vport_stats */
     OVS_VPORT_ATTR_PAD,
     OVS_VPORT_ATTR_IFINDEX,
     OVS_VPORT_ATTR_NETNSID,
     __OVS_VPORT_ATTR_MAX
 };
 
 #define OVS_VPORT_ATTR_MAX (__OVS_VPORT_ATTR_MAX - 1)
 
 enum {
     OVS_VXLAN_EXT_UNSPEC,
     OVS_VXLAN_EXT_GBP,  /* Flag or __u32 */
     __OVS_VXLAN_EXT_MAX,
 };
 
 #define OVS_VXLAN_EXT_MAX (__OVS_VXLAN_EXT_MAX - 1)
 
 
 /* OVS_VPORT_ATTR_OPTIONS attributes for tunnels.
  */
 enum {
     OVS_TUNNEL_ATTR_UNSPEC,
     OVS_TUNNEL_ATTR_DST_PORT, /* 16-bit UDP port, used by L4 tunnels. */
     OVS_TUNNEL_ATTR_EXTENSION,
     __OVS_TUNNEL_ATTR_MAX
 };
 
 #define OVS_TUNNEL_ATTR_MAX (__OVS_TUNNEL_ATTR_MAX - 1)
 
 /* Flows. */
 
 #define OVS_FLOW_FAMILY  "ovs_flow"
 #define OVS_FLOW_MCGROUP "ovs_flow"
 #define OVS_FLOW_VERSION 0x1
 
 enum ovs_flow_cmd {
     OVS_FLOW_CMD_UNSPEC,
     OVS_FLOW_CMD_NEW,
     OVS_FLOW_CMD_DEL,
     OVS_FLOW_CMD_GET,
     OVS_FLOW_CMD_SET
 };
 
 struct ovs_flow_stats {
     __u64 n_packets;         /* Number of matched packets. */
     __u64 n_bytes;           /* Number of matched bytes. */
 };
 
 enum ovs_key_attr {
     OVS_KEY_ATTR_UNSPEC,
     OVS_KEY_ATTR_ENCAP, /* Nested set of encapsulated attributes. */
     OVS_KEY_ATTR_PRIORITY,  /* u32 skb->priority */
     OVS_KEY_ATTR_IN_PORT,   /* u32 OVS dp port number */
     OVS_KEY_ATTR_ETHERNET,  /* struct ovs_key_ethernet */
     OVS_KEY_ATTR_VLAN,  /* be16 VLAN TCI */
     OVS_KEY_ATTR_ETHERTYPE, /* be16 Ethernet type */
     OVS_KEY_ATTR_IPV4,      /* struct ovs_key_ipv4 */
     OVS_KEY_ATTR_IPV6,      /* struct ovs_key_ipv6 */
     OVS_KEY_ATTR_TCP,       /* struct ovs_key_tcp */
     OVS_KEY_ATTR_UDP,       /* struct ovs_key_udp */
     OVS_KEY_ATTR_ICMP,      /* struct ovs_key_icmp */
     OVS_KEY_ATTR_ICMPV6,    /* struct ovs_key_icmpv6 */
     OVS_KEY_ATTR_ARP,       /* struct ovs_key_arp */
     OVS_KEY_ATTR_ND,        /* struct ovs_key_nd */
     OVS_KEY_ATTR_SKB_MARK,  /* u32 skb mark */
     OVS_KEY_ATTR_TUNNEL,    /* Nested set of ovs_tunnel attributes */
     OVS_KEY_ATTR_SCTP,      /* struct ovs_key_sctp */
     OVS_KEY_ATTR_TCP_FLAGS, /* be16 TCP flags. */
     OVS_KEY_ATTR_DP_HASH,      /* u32 hash value. Value 0 indicates the hash
                    is not computed by the datapath. */
     OVS_KEY_ATTR_RECIRC_ID, /* u32 recirc id */
     OVS_KEY_ATTR_MPLS,      /* array of struct ovs_key_mpls.
                  * The implementation may restrict
                  * the accepted length of the array. */
     OVS_KEY_ATTR_CT_STATE,  /* u32 bitmask of OVS_CS_F_* */
     OVS_KEY_ATTR_CT_ZONE,   /* u16 connection tracking zone. */
     OVS_KEY_ATTR_CT_MARK,   /* u32 connection tracking mark */
     OVS_KEY_ATTR_CT_LABELS, /* 16-octet connection tracking label */
     OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV4,   /* struct ovs_key_ct_tuple_ipv4 */
     OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV6,   /* struct ovs_key_ct_tuple_ipv6 */
     OVS_KEY_ATTR_NSH,       /* Nested set of ovs_nsh_key_* */
 
     /* User space decided to squat on types 29 and 30.  They are defined
      * below, but should not be sent to the kernel.
      *
      * WARNING: No new types should be added unless they are defined
      *          for both kernel and user space (no 'ifdef's).  It's hard
      *          to keep compatibility otherwise.
      */
     OVS_KEY_ATTR_PACKET_TYPE,   /* be32 packet type */
     OVS_KEY_ATTR_ND_EXTENSIONS, /* IPv6 Neighbor Discovery extensions */
 
     OVS_KEY_ATTR_TUNNEL_INFO,   /* struct ip_tunnel_info.
                      * For in-kernel use only.
                      */
     OVS_KEY_ATTR_IPV6_EXTHDRS,  /* struct ovs_key_ipv6_exthdr */
     __OVS_KEY_ATTR_MAX
 };
 
 #define OVS_KEY_ATTR_MAX (__OVS_KEY_ATTR_MAX - 1)
 
 enum ovs_tunnel_key_attr {
     /* OVS_TUNNEL_KEY_ATTR_NONE, standard nl API requires this attribute! */
     OVS_TUNNEL_KEY_ATTR_ID,                 /* be64 Tunnel ID */
     OVS_TUNNEL_KEY_ATTR_IPV4_SRC,           /* be32 src IP address. */
     OVS_TUNNEL_KEY_ATTR_IPV4_DST,           /* be32 dst IP address. */
     OVS_TUNNEL_KEY_ATTR_TOS,                /* u8 Tunnel IP ToS. */
     OVS_TUNNEL_KEY_ATTR_TTL,                /* u8 Tunnel IP TTL. */
     OVS_TUNNEL_KEY_ATTR_DONT_FRAGMENT,      /* No argument, set DF. */
     OVS_TUNNEL_KEY_ATTR_CSUM,               /* No argument. CSUM packet. */
     OVS_TUNNEL_KEY_ATTR_OAM,                /* No argument. OAM frame.  */
     OVS_TUNNEL_KEY_ATTR_GENEVE_OPTS,        /* Array of Geneve options. */
     OVS_TUNNEL_KEY_ATTR_TP_SRC,     /* be16 src Transport Port. */
     OVS_TUNNEL_KEY_ATTR_TP_DST,     /* be16 dst Transport Port. */
     OVS_TUNNEL_KEY_ATTR_VXLAN_OPTS,     /* Nested OVS_VXLAN_EXT_* */
     OVS_TUNNEL_KEY_ATTR_IPV6_SRC,       /* struct in6_addr src IPv6 address. */
     OVS_TUNNEL_KEY_ATTR_IPV6_DST,       /* struct in6_addr dst IPv6 address. */
     OVS_TUNNEL_KEY_ATTR_PAD,
     OVS_TUNNEL_KEY_ATTR_ERSPAN_OPTS,    /* struct erspan_metadata */
     OVS_TUNNEL_KEY_ATTR_IPV4_INFO_BRIDGE,   /* No argument. IPV4_INFO_BRIDGE mode.*/
     __OVS_TUNNEL_KEY_ATTR_MAX
 };
 
 #define OVS_TUNNEL_KEY_ATTR_MAX (__OVS_TUNNEL_KEY_ATTR_MAX - 1)
 
 /**
  * enum ovs_frag_type - IPv4 and IPv6 fragment type
  * @OVS_FRAG_TYPE_NONE: Packet is not a fragment.
  * @OVS_FRAG_TYPE_FIRST: Packet is a fragment with offset 0.
  * @OVS_FRAG_TYPE_LATER: Packet is a fragment with nonzero offset.
  *
  * Used as the @ipv4_frag in &struct ovs_key_ipv4 and as @ipv6_frag &struct
  * ovs_key_ipv6.
  */
 enum ovs_frag_type {
     OVS_FRAG_TYPE_NONE,
     OVS_FRAG_TYPE_FIRST,
     OVS_FRAG_TYPE_LATER,
     __OVS_FRAG_TYPE_MAX
 };
 
 #define OVS_FRAG_TYPE_MAX (__OVS_FRAG_TYPE_MAX - 1)
 
 struct ovs_key_ethernet {
     __u8     eth_src[ETH_ALEN];
     __u8     eth_dst[ETH_ALEN];
 };
 
 struct ovs_key_mpls {
     __be32 mpls_lse;
 };
 
 struct ovs_key_ipv4 {
     __be32 ipv4_src;
     __be32 ipv4_dst;
     __u8   ipv4_proto;
     __u8   ipv4_tos;
     __u8   ipv4_ttl;
     __u8   ipv4_frag;   /* One of OVS_FRAG_TYPE_*. */
 };
 
 struct ovs_key_ipv6 {
     __be32 ipv6_src[4];
     __be32 ipv6_dst[4];
     __be32 ipv6_label;  /* 20-bits in least-significant bits. */
     __u8   ipv6_proto;
     __u8   ipv6_tclass;
     __u8   ipv6_hlimit;
     __u8   ipv6_frag;   /* One of OVS_FRAG_TYPE_*. */
 };
 
 /* separate structure to support backward compatibility with older user space */
 struct ovs_key_ipv6_exthdrs {
     __u16  hdrs;
 };
 
 struct ovs_key_tcp {
     __be16 tcp_src;
     __be16 tcp_dst;
 };
 
 struct ovs_key_udp {
     __be16 udp_src;
     __be16 udp_dst;
 };
 
 struct ovs_key_sctp {
     __be16 sctp_src;
     __be16 sctp_dst;
 };
 
 struct ovs_key_icmp {
     __u8 icmp_type;
     __u8 icmp_code;
 };
 
 struct ovs_key_icmpv6 {
     __u8 icmpv6_type;
     __u8 icmpv6_code;
 };
 
 struct ovs_key_arp {
     __be32 arp_sip;
     __be32 arp_tip;
     __be16 arp_op;
     __u8   arp_sha[ETH_ALEN];
     __u8   arp_tha[ETH_ALEN];
 };
 
 struct ovs_key_nd {
     __be32  nd_target[4];
     __u8    nd_sll[ETH_ALEN];
     __u8    nd_tll[ETH_ALEN];
 };
 
 #define OVS_CT_LABELS_LEN_32    4
 #define OVS_CT_LABELS_LEN   (OVS_CT_LABELS_LEN_32 * sizeof(__u32))
 struct ovs_key_ct_labels {
     union {
         __u8    ct_labels[OVS_CT_LABELS_LEN];
         __u32   ct_labels_32[OVS_CT_LABELS_LEN_32];
     };
 };
 
 /* OVS_KEY_ATTR_CT_STATE flags */
 #define OVS_CS_F_NEW               0x01 /* Beginning of a new connection. */
 #define OVS_CS_F_ESTABLISHED       0x02 /* Part of an existing connection. */
 #define OVS_CS_F_RELATED           0x04 /* Related to an established
                      * connection. */
 #define OVS_CS_F_REPLY_DIR         0x08 /* Flow is in the reply direction. */
 #define OVS_CS_F_INVALID           0x10 /* Could not track connection. */
 #define OVS_CS_F_TRACKED           0x20 /* Conntrack has occurred. */
 #define OVS_CS_F_SRC_NAT           0x40 /* Packet's source address/port was
                      * mangled by NAT.
                      */
 #define OVS_CS_F_DST_NAT           0x80 /* Packet's destination address/port
                      * was mangled by NAT.
                      */
 
 #define OVS_CS_F_NAT_MASK (OVS_CS_F_SRC_NAT | OVS_CS_F_DST_NAT)
 
 struct ovs_key_ct_tuple_ipv4 {
     __be32 ipv4_src;
     __be32 ipv4_dst;
     __be16 src_port;
     __be16 dst_port;
     __u8   ipv4_proto;
 };
 
 struct ovs_key_ct_tuple_ipv6 {
     __be32 ipv6_src[4];
     __be32 ipv6_dst[4];
     __be16 src_port;
     __be16 dst_port;
     __u8   ipv6_proto;
 };
 
 enum ovs_nsh_key_attr {
     OVS_NSH_KEY_ATTR_UNSPEC,
     OVS_NSH_KEY_ATTR_BASE,  /* struct ovs_nsh_key_base. */
     OVS_NSH_KEY_ATTR_MD1,   /* struct ovs_nsh_key_md1. */
     OVS_NSH_KEY_ATTR_MD2,   /* variable-length octets for MD type 2. */
     __OVS_NSH_KEY_ATTR_MAX
 };
 
 #define OVS_NSH_KEY_ATTR_MAX (__OVS_NSH_KEY_ATTR_MAX - 1)
 
 struct ovs_nsh_key_base {
     __u8 flags;
     __u8 ttl;
     __u8 mdtype;
     __u8 np;
     __be32 path_hdr;
 };
 
 #define NSH_MD1_CONTEXT_SIZE 4
 
 struct ovs_nsh_key_md1 {
     __be32 context[NSH_MD1_CONTEXT_SIZE];
 };
 
 /**
  * enum ovs_flow_attr - attributes for %OVS_FLOW_* commands.
  * @OVS_FLOW_ATTR_KEY: Nested %OVS_KEY_ATTR_* attributes specifying the flow
  * key.  Always present in notifications.  Required for all requests (except
  * dumps).
  * @OVS_FLOW_ATTR_ACTIONS: Nested %OVS_ACTION_ATTR_* attributes specifying
  * the actions to take for packets that match the key.  Always present in
  * notifications.  Required for %OVS_FLOW_CMD_NEW requests, optional for
  * %OVS_FLOW_CMD_SET requests.  An %OVS_FLOW_CMD_SET without
  * %OVS_FLOW_ATTR_ACTIONS will not modify the actions.  To clear the actions,
  * an %OVS_FLOW_ATTR_ACTIONS without any nested attributes must be given.
  * @OVS_FLOW_ATTR_STATS: &struct ovs_flow_stats giving statistics for this
  * flow.  Present in notifications if the stats would be nonzero.  Ignored in
  * requests.
  * @OVS_FLOW_ATTR_TCP_FLAGS: An 8-bit value giving the OR'd value of all of the
  * TCP flags seen on packets in this flow.  Only present in notifications for
  * TCP flows, and only if it would be nonzero.  Ignored in requests.
  * @OVS_FLOW_ATTR_USED: A 64-bit integer giving the time, in milliseconds on
  * the system monotonic clock, at which a packet was last processed for this
  * flow.  Only present in notifications if a packet has been processed for this
  * flow.  Ignored in requests.
  * @OVS_FLOW_ATTR_CLEAR: If present in a %OVS_FLOW_CMD_SET request, clears the
  * last-used time, accumulated TCP flags, and statistics for this flow.
  * Otherwise ignored in requests.  Never present in notifications.
  * @OVS_FLOW_ATTR_MASK: Nested %OVS_KEY_ATTR_* attributes specifying the
  * mask bits for wildcarded flow match. Mask bit value '1' specifies exact
  * match with corresponding flow key bit, while mask bit value '0' specifies
  * a wildcarded match. Omitting attribute is treated as wildcarding all
  * corresponding fields. Optional for all requests. If not present,
  * all flow key bits are exact match bits.
  * @OVS_FLOW_ATTR_UFID: A value between 1-16 octets specifying a unique
  * identifier for the flow. Causes the flow to be indexed by this value rather
  * than the value of the %OVS_FLOW_ATTR_KEY attribute. Optional for all
  * requests. Present in notifications if the flow was created with this
  * attribute.
  * @OVS_FLOW_ATTR_UFID_FLAGS: A 32-bit value of OR'd %OVS_UFID_F_*
  * flags that provide alternative semantics for flow installation and
  * retrieval. Optional for all requests.
  *
  * These attributes follow the &struct ovs_header within the Generic Netlink
  * payload for %OVS_FLOW_* commands.
  */
 enum ovs_flow_attr {
     OVS_FLOW_ATTR_UNSPEC,
     OVS_FLOW_ATTR_KEY,       /* Sequence of OVS_KEY_ATTR_* attributes. */
     OVS_FLOW_ATTR_ACTIONS,   /* Nested OVS_ACTION_ATTR_* attributes. */
     OVS_FLOW_ATTR_STATS,     /* struct ovs_flow_stats. */
     OVS_FLOW_ATTR_TCP_FLAGS, /* 8-bit OR'd TCP flags. */
     OVS_FLOW_ATTR_USED,      /* u64 msecs last used in monotonic time. */
     OVS_FLOW_ATTR_CLEAR,     /* Flag to clear stats, tcp_flags, used. */
     OVS_FLOW_ATTR_MASK,      /* Sequence of OVS_KEY_ATTR_* attributes. */
     OVS_FLOW_ATTR_PROBE,     /* Flow operation is a feature probe, error
                   * logging should be suppressed. */
     OVS_FLOW_ATTR_UFID,      /* Variable length unique flow identifier. */
     OVS_FLOW_ATTR_UFID_FLAGS,/* u32 of OVS_UFID_F_*. */
     OVS_FLOW_ATTR_PAD,
     __OVS_FLOW_ATTR_MAX
 };
 
 #define OVS_FLOW_ATTR_MAX (__OVS_FLOW_ATTR_MAX - 1)
 
 /**
  * Omit attributes for notifications.
  *
  * If a datapath request contains an %OVS_UFID_F_OMIT_* flag, then the datapath
  * may omit the corresponding %OVS_FLOW_ATTR_* from the response.
  */
 #define OVS_UFID_F_OMIT_KEY      (1 << 0)
 #define OVS_UFID_F_OMIT_MASK     (1 << 1)
 #define OVS_UFID_F_OMIT_ACTIONS  (1 << 2)
 
 /**
  * enum ovs_sample_attr - Attributes for %OVS_ACTION_ATTR_SAMPLE action.
  * @OVS_SAMPLE_ATTR_PROBABILITY: 32-bit fraction of packets to sample with
  * @OVS_ACTION_ATTR_SAMPLE.  A value of 0 samples no packets, a value of
  * %UINT32_MAX samples all packets and intermediate values sample intermediate
  * fractions of packets.
  * @OVS_SAMPLE_ATTR_ACTIONS: Set of actions to execute in sampling event.
  * Actions are passed as nested attributes.
  *
  * Executes the specified actions with the given probability on a per-packet
  * basis.
  */
 enum ovs_sample_attr {
     OVS_SAMPLE_ATTR_UNSPEC,
     OVS_SAMPLE_ATTR_PROBABILITY, /* u32 number */
     OVS_SAMPLE_ATTR_ACTIONS,     /* Nested OVS_ACTION_ATTR_* attributes. */
     __OVS_SAMPLE_ATTR_MAX,
 
 #ifdef __KERNEL__
     OVS_SAMPLE_ATTR_ARG          /* struct sample_arg  */
 #endif
 };
 
 #define OVS_SAMPLE_ATTR_MAX (__OVS_SAMPLE_ATTR_MAX - 1)
 
 #ifdef __KERNEL__
 struct sample_arg {
     bool exec;                   /* When true, actions in sample will not
                       * change flow keys. False otherwise.
                       */
     u32  probability;            /* Same value as
                       * 'OVS_SAMPLE_ATTR_PROBABILITY'.
                       */
 };
 #endif
 
 /**
  * enum ovs_userspace_attr - Attributes for %OVS_ACTION_ATTR_USERSPACE action.
  * @OVS_USERSPACE_ATTR_PID: u32 Netlink PID to which the %OVS_PACKET_CMD_ACTION
  * message should be sent.  Required.
  * @OVS_USERSPACE_ATTR_USERDATA: If present, its variable-length argument is
  * copied to the %OVS_PACKET_CMD_ACTION message as %OVS_PACKET_ATTR_USERDATA.
  * @OVS_USERSPACE_ATTR_EGRESS_TUN_PORT: If present, u32 output port to get
  * tunnel info.
  * @OVS_USERSPACE_ATTR_ACTIONS: If present, send actions with upcall.
  */
 enum ovs_userspace_attr {
     OVS_USERSPACE_ATTR_UNSPEC,
     OVS_USERSPACE_ATTR_PID,       /* u32 Netlink PID to receive upcalls. */
     OVS_USERSPACE_ATTR_USERDATA,  /* Optional user-specified cookie. */
     OVS_USERSPACE_ATTR_EGRESS_TUN_PORT,  /* Optional, u32 output port
                           * to get tunnel info. */
     OVS_USERSPACE_ATTR_ACTIONS,   /* Optional flag to get actions. */
     __OVS_USERSPACE_ATTR_MAX
 };
 
 #define OVS_USERSPACE_ATTR_MAX (__OVS_USERSPACE_ATTR_MAX - 1)
 
 struct ovs_action_trunc {
     __u32 max_len; /* Max packet size in bytes. */
 };
 
 /**
  * struct ovs_action_push_mpls - %OVS_ACTION_ATTR_PUSH_MPLS action argument.
  * @mpls_lse: MPLS label stack entry to push.
  * @mpls_ethertype: Ethertype to set in the encapsulating ethernet frame.
  *
  * The only values @mpls_ethertype should ever be given are %ETH_P_MPLS_UC and
  * %ETH_P_MPLS_MC, indicating MPLS unicast or multicast. Other are rejected.
  */
 struct ovs_action_push_mpls {
     __be32 mpls_lse;
     __be16 mpls_ethertype; /* Either %ETH_P_MPLS_UC or %ETH_P_MPLS_MC */
 };
 
 /**
  * struct ovs_action_add_mpls - %OVS_ACTION_ATTR_ADD_MPLS action
  * argument.
  * @mpls_lse: MPLS label stack entry to push.
  * @mpls_ethertype: Ethertype to set in the encapsulating ethernet frame.
  * @tun_flags: MPLS tunnel attributes.
  *
  * The only values @mpls_ethertype should ever be given are %ETH_P_MPLS_UC and
  * %ETH_P_MPLS_MC, indicating MPLS unicast or multicast. Other are rejected.
  */
 struct ovs_action_add_mpls {
     __be32 mpls_lse;
     __be16 mpls_ethertype; /* Either %ETH_P_MPLS_UC or %ETH_P_MPLS_MC */
     __u16 tun_flags;
 };
 
 #define OVS_MPLS_L3_TUNNEL_FLAG_MASK  (1 << 0) /* Flag to specify the place of
                         * insertion of MPLS header.
                         * When false, the MPLS header
                         * will be inserted at the start
                         * of the packet.
                         * When true, the MPLS header
                         * will be inserted at the start
                         * of the l3 header.
                         */
 
 /**
  * struct ovs_action_push_vlan - %OVS_ACTION_ATTR_PUSH_VLAN action argument.
  * @vlan_tpid: Tag protocol identifier (TPID) to push.
  * @vlan_tci: Tag control identifier (TCI) to push.  The CFI bit must be set
  * (but it will not be set in the 802.1Q header that is pushed).
  *
  * The @vlan_tpid value is typically %ETH_P_8021Q or %ETH_P_8021AD.
  * The only acceptable TPID values are those that the kernel module also parses
  * as 802.1Q or 802.1AD headers, to prevent %OVS_ACTION_ATTR_PUSH_VLAN followed
  * by %OVS_ACTION_ATTR_POP_VLAN from having surprising results.
  */
 struct ovs_action_push_vlan {
     __be16 vlan_tpid;   /* 802.1Q or 802.1ad TPID. */
     __be16 vlan_tci;    /* 802.1Q TCI (VLAN ID and priority). */
 };
 
 /* Data path hash algorithm for computing Datapath hash.
  *
  * The algorithm type only specifies the fields in a flow
  * will be used as part of the hash. Each datapath is free
  * to use its own hash algorithm. The hash value will be
  * opaque to the user space daemon.
  */
 enum ovs_hash_alg {
     OVS_HASH_ALG_L4,
 };
 
 /*
  * struct ovs_action_hash - %OVS_ACTION_ATTR_HASH action argument.
  * @hash_alg: Algorithm used to compute hash prior to recirculation.
  * @hash_basis: basis used for computing hash.
  */
 struct ovs_action_hash {
     __u32  hash_alg;     /* One of ovs_hash_alg. */
     __u32  hash_basis;
 };
 
 /**
  * enum ovs_ct_attr - Attributes for %OVS_ACTION_ATTR_CT action.
  * @OVS_CT_ATTR_COMMIT: If present, commits the connection to the conntrack
  * table. This allows future packets for the same connection to be identified
  * as 'established' or 'related'. The flow key for the current packet will
  * retain the pre-commit connection state.
  * @OVS_CT_ATTR_ZONE: u16 connection tracking zone.
  * @OVS_CT_ATTR_MARK: u32 value followed by u32 mask. For each bit set in the
  * mask, the corresponding bit in the value is copied to the connection
  * tracking mark field in the connection.
  * @OVS_CT_ATTR_LABELS: %OVS_CT_LABELS_LEN value followed by %OVS_CT_LABELS_LEN
  * mask. For each bit set in the mask, the corresponding bit in the value is
  * copied to the connection tracking label field in the connection.
  * @OVS_CT_ATTR_HELPER: variable length string defining conntrack ALG.
  * @OVS_CT_ATTR_NAT: Nested OVS_NAT_ATTR_* for performing L3 network address
  * translation (NAT) on the packet.
  * @OVS_CT_ATTR_FORCE_COMMIT: Like %OVS_CT_ATTR_COMMIT, but instead of doing
  * nothing if the connection is already committed will check that the current
  * packet is in conntrack entry's original direction.  If directionality does
  * not match, will delete the existing conntrack entry and commit a new one.
  * @OVS_CT_ATTR_EVENTMASK: Mask of bits indicating which conntrack event types
  * (enum ip_conntrack_events IPCT_*) should be reported.  For any bit set to
  * zero, the corresponding event type is not generated.  Default behavior
  * depends on system configuration, but typically all event types are
  * generated, hence listening on NFNLGRP_CONNTRACK_UPDATE events may get a lot
  * of events.  Explicitly passing this attribute allows limiting the updates
  * received to the events of interest.  The bit 1 << IPCT_NEW, 1 <<
  * IPCT_RELATED, and 1 << IPCT_DESTROY must be set to ones for those events to
  * be received on NFNLGRP_CONNTRACK_NEW and NFNLGRP_CONNTRACK_DESTROY groups,
  * respectively.  Remaining bits control the changes for which an event is
  * delivered on the NFNLGRP_CONNTRACK_UPDATE group.
  * @OVS_CT_ATTR_TIMEOUT: Variable length string defining conntrack timeout.
  */
 enum ovs_ct_attr {
     OVS_CT_ATTR_UNSPEC,
     OVS_CT_ATTR_COMMIT,     /* No argument, commits connection. */
     OVS_CT_ATTR_ZONE,       /* u16 zone id. */
     OVS_CT_ATTR_MARK,       /* mark to associate with this connection. */
     OVS_CT_ATTR_LABELS,     /* labels to associate with this connection. */
     OVS_CT_ATTR_HELPER,     /* netlink helper to assist detection of
                    related connections. */
     OVS_CT_ATTR_NAT,        /* Nested OVS_NAT_ATTR_* */
     OVS_CT_ATTR_FORCE_COMMIT,  /* No argument */
     OVS_CT_ATTR_EVENTMASK,  /* u32 mask of IPCT_* events. */
     OVS_CT_ATTR_TIMEOUT,    /* Associate timeout with this connection for
                  * fine-grain timeout tuning. */
     __OVS_CT_ATTR_MAX
 };
 
 #define OVS_CT_ATTR_MAX (__OVS_CT_ATTR_MAX - 1)
 
 /**
  * enum ovs_nat_attr - Attributes for %OVS_CT_ATTR_NAT.
  *
  * @OVS_NAT_ATTR_SRC: Flag for Source NAT (mangle source address/port).
  * @OVS_NAT_ATTR_DST: Flag for Destination NAT (mangle destination
  * address/port).  Only one of (@OVS_NAT_ATTR_SRC, @OVS_NAT_ATTR_DST) may be
  * specified.  Effective only for packets for ct_state NEW connections.
  * Packets of committed connections are mangled by the NAT action according to
  * the committed NAT type regardless of the flags specified.  As a corollary, a
  * NAT action without a NAT type flag will only mangle packets of committed
  * connections.  The following NAT attributes only apply for NEW
  * (non-committed) connections, and they may be included only when the CT
  * action has the @OVS_CT_ATTR_COMMIT flag and either @OVS_NAT_ATTR_SRC or
  * @OVS_NAT_ATTR_DST is also included.
  * @OVS_NAT_ATTR_IP_MIN: struct in_addr or struct in6_addr
  * @OVS_NAT_ATTR_IP_MAX: struct in_addr or struct in6_addr
  * @OVS_NAT_ATTR_PROTO_MIN: u16 L4 protocol specific lower boundary (port)
  * @OVS_NAT_ATTR_PROTO_MAX: u16 L4 protocol specific upper boundary (port)
  * @OVS_NAT_ATTR_PERSISTENT: Flag for persistent IP mapping across reboots
  * @OVS_NAT_ATTR_PROTO_HASH: Flag for pseudo random L4 port mapping (MD5)
  * @OVS_NAT_ATTR_PROTO_RANDOM: Flag for fully randomized L4 port mapping
  */
 enum ovs_nat_attr {
     OVS_NAT_ATTR_UNSPEC,
     OVS_NAT_ATTR_SRC,
     OVS_NAT_ATTR_DST,
     OVS_NAT_ATTR_IP_MIN,
     OVS_NAT_ATTR_IP_MAX,
     OVS_NAT_ATTR_PROTO_MIN,
     OVS_NAT_ATTR_PROTO_MAX,
     OVS_NAT_ATTR_PERSISTENT,
     OVS_NAT_ATTR_PROTO_HASH,
     OVS_NAT_ATTR_PROTO_RANDOM,
     __OVS_NAT_ATTR_MAX,
 };
 
 #define OVS_NAT_ATTR_MAX (__OVS_NAT_ATTR_MAX - 1)
 
 /*
  * struct ovs_action_push_eth - %OVS_ACTION_ATTR_PUSH_ETH action argument.
  * @addresses: Source and destination MAC addresses.
  * @eth_type: Ethernet type
  */
 struct ovs_action_push_eth {
     struct ovs_key_ethernet addresses;
 };
 
 /*
  * enum ovs_check_pkt_len_attr - Attributes for %OVS_ACTION_ATTR_CHECK_PKT_LEN.
  *
  * @OVS_CHECK_PKT_LEN_ATTR_PKT_LEN: u16 Packet length to check for.
  * @OVS_CHECK_PKT_LEN_ATTR_ACTIONS_IF_GREATER: Nested OVS_ACTION_ATTR_*
  * actions to apply if the packer length is greater than the specified
  * length in the attr - OVS_CHECK_PKT_LEN_ATTR_PKT_LEN.
  * @OVS_CHECK_PKT_LEN_ATTR_ACTIONS_IF_LESS_EQUAL - Nested OVS_ACTION_ATTR_*
  * actions to apply if the packer length is lesser or equal to the specified
  * length in the attr - OVS_CHECK_PKT_LEN_ATTR_PKT_LEN.
  */
 enum ovs_check_pkt_len_attr {
     OVS_CHECK_PKT_LEN_ATTR_UNSPEC,
     OVS_CHECK_PKT_LEN_ATTR_PKT_LEN,
     OVS_CHECK_PKT_LEN_ATTR_ACTIONS_IF_GREATER,
     OVS_CHECK_PKT_LEN_ATTR_ACTIONS_IF_LESS_EQUAL,
     __OVS_CHECK_PKT_LEN_ATTR_MAX,
 
 #ifdef __KERNEL__
     OVS_CHECK_PKT_LEN_ATTR_ARG          /* struct check_pkt_len_arg  */
 #endif
 };
 
 #define OVS_CHECK_PKT_LEN_ATTR_MAX (__OVS_CHECK_PKT_LEN_ATTR_MAX - 1)
 
 #ifdef __KERNEL__
 struct check_pkt_len_arg {
     u16 pkt_len;    /* Same value as OVS_CHECK_PKT_LEN_ATTR_PKT_LEN'. */
     bool exec_for_greater;  /* When true, actions in IF_GREATER will
                  * not change flow keys. False otherwise.
                  */
     bool exec_for_lesser_equal; /* When true, actions in IF_LESS_EQUAL
                      * will not change flow keys. False
                      * otherwise.
                      */
 };
 #endif
 
 /**
  * enum ovs_action_attr - Action types.
  *
  * @OVS_ACTION_ATTR_OUTPUT: Output packet to port.
  * @OVS_ACTION_ATTR_TRUNC: Output packet to port with truncated packet size.
  * @OVS_ACTION_ATTR_USERSPACE: Send packet to userspace according to nested
  * %OVS_USERSPACE_ATTR_* attributes.
  * @OVS_ACTION_ATTR_SET: Replaces the contents of an existing header.  The
  * single nested %OVS_KEY_ATTR_* attribute specifies a header to modify and its
  * value.
  * @OVS_ACTION_ATTR_SET_MASKED: Replaces the contents of an existing header.  A
  * nested %OVS_KEY_ATTR_* attribute specifies a header to modify, its value,
  * and a mask.  For every bit set in the mask, the corresponding bit value
  * is copied from the value to the packet header field, rest of the bits are
  * left unchanged.  The non-masked value bits must be passed in as zeroes.
  * Masking is not supported for the %OVS_KEY_ATTR_TUNNEL attribute.
  * @OVS_ACTION_ATTR_PUSH_VLAN: Push a new outermost 802.1Q or 802.1ad header
  * onto the packet.
  * @OVS_ACTION_ATTR_POP_VLAN: Pop the outermost 802.1Q or 802.1ad header
  * from the packet.
  * @OVS_ACTION_ATTR_SAMPLE: Probabilitically executes actions, as specified in
  * the nested %OVS_SAMPLE_ATTR_* attributes.
  * @OVS_ACTION_ATTR_PUSH_MPLS: Push a new MPLS label stack entry onto the
  * top of the packets MPLS label stack.  Set the ethertype of the
  * encapsulating frame to either %ETH_P_MPLS_UC or %ETH_P_MPLS_MC to
  * indicate the new packet contents.
  * @OVS_ACTION_ATTR_POP_MPLS: Pop an MPLS label stack entry off of the
  * packet's MPLS label stack.  Set the encapsulating frame's ethertype to
  * indicate the new packet contents. This could potentially still be
  * %ETH_P_MPLS if the resulting MPLS label stack is not empty.  If there
  * is no MPLS label stack, as determined by ethertype, no action is taken.
  * @OVS_ACTION_ATTR_CT: Track the connection. Populate the conntrack-related
  * entries in the flow key.
  * @OVS_ACTION_ATTR_PUSH_ETH: Push a new outermost Ethernet header onto the
  * packet.
  * @OVS_ACTION_ATTR_POP_ETH: Pop the outermost Ethernet header off the
  * packet.
  * @OVS_ACTION_ATTR_CT_CLEAR: Clear conntrack state from the packet.
  * @OVS_ACTION_ATTR_PUSH_NSH: push NSH header to the packet.
  * @OVS_ACTION_ATTR_POP_NSH: pop the outermost NSH header off the packet.
  * @OVS_ACTION_ATTR_METER: Run packet through a meter, which may drop the
  * packet, or modify the packet (e.g., change the DSCP field).
  * @OVS_ACTION_ATTR_CLONE: make a copy of the packet and execute a list of
  * actions without affecting the original packet and key.
  * @OVS_ACTION_ATTR_CHECK_PKT_LEN: Check the packet length and execute a set
  * of actions if greater than the specified packet length, else execute
  * another set of actions.
  * @OVS_ACTION_ATTR_ADD_MPLS: Push a new MPLS label stack entry at the
  * start of the packet or at the start of the l3 header depending on the value
  * of l3 tunnel flag in the tun_flags field of OVS_ACTION_ATTR_ADD_MPLS
  * argument.
  *
  * Only a single header can be set with a single %OVS_ACTION_ATTR_SET.  Not all
  * fields within a header are modifiable, e.g. the IPv4 protocol and fragment
  * type may not be changed.
  *
  * @OVS_ACTION_ATTR_SET_TO_MASKED: Kernel internal masked set action translated
  * from the @OVS_ACTION_ATTR_SET.
  */
 
 enum ovs_action_attr {
     OVS_ACTION_ATTR_UNSPEC,
     OVS_ACTION_ATTR_OUTPUT,       /* u32 port number. */
     OVS_ACTION_ATTR_USERSPACE,    /* Nested OVS_USERSPACE_ATTR_*. */
     OVS_ACTION_ATTR_SET,          /* One nested OVS_KEY_ATTR_*. */
     OVS_ACTION_ATTR_PUSH_VLAN,    /* struct ovs_action_push_vlan. */
     OVS_ACTION_ATTR_POP_VLAN,     /* No argument. */
     OVS_ACTION_ATTR_SAMPLE,       /* Nested OVS_SAMPLE_ATTR_*. */
     OVS_ACTION_ATTR_RECIRC,       /* u32 recirc_id. */
     OVS_ACTION_ATTR_HASH,         /* struct ovs_action_hash. */
     OVS_ACTION_ATTR_PUSH_MPLS,    /* struct ovs_action_push_mpls. */
     OVS_ACTION_ATTR_POP_MPLS,     /* __be16 ethertype. */
     OVS_ACTION_ATTR_SET_MASKED,   /* One nested OVS_KEY_ATTR_* including
                        * data immediately followed by a mask.
                        * The data must be zero for the unmasked
                        * bits. */
     OVS_ACTION_ATTR_CT,           /* Nested OVS_CT_ATTR_* . */
     OVS_ACTION_ATTR_TRUNC,        /* u32 struct ovs_action_trunc. */
     OVS_ACTION_ATTR_PUSH_ETH,     /* struct ovs_action_push_eth. */
     OVS_ACTION_ATTR_POP_ETH,      /* No argument. */
     OVS_ACTION_ATTR_CT_CLEAR,     /* No argument. */
     OVS_ACTION_ATTR_PUSH_NSH,     /* Nested OVS_NSH_KEY_ATTR_*. */
     OVS_ACTION_ATTR_POP_NSH,      /* No argument. */
     OVS_ACTION_ATTR_METER,        /* u32 meter ID. */
     OVS_ACTION_ATTR_CLONE,        /* Nested OVS_CLONE_ATTR_*.  */
     OVS_ACTION_ATTR_CHECK_PKT_LEN, /* Nested OVS_CHECK_PKT_LEN_ATTR_*. */
     OVS_ACTION_ATTR_ADD_MPLS,     /* struct ovs_action_add_mpls. */
     OVS_ACTION_ATTR_DEC_TTL,      /* Nested OVS_DEC_TTL_ATTR_*. */
 
     __OVS_ACTION_ATTR_MAX,        /* Nothing past this will be accepted
                        * from userspace. */
 
 #ifdef __KERNEL__
     OVS_ACTION_ATTR_SET_TO_MASKED, /* Kernel module internal masked
                     * set action converted from
                     * OVS_ACTION_ATTR_SET. */
 #endif
 };
 
 #define OVS_ACTION_ATTR_MAX (__OVS_ACTION_ATTR_MAX - 1)
 
 /* Meters. */
 #define OVS_METER_FAMILY  "ovs_meter"
 #define OVS_METER_MCGROUP "ovs_meter"
 #define OVS_METER_VERSION 0x1
 
 enum ovs_meter_cmd {
     OVS_METER_CMD_UNSPEC,
     OVS_METER_CMD_FEATURES, /* Get features supported by the datapath. */
     OVS_METER_CMD_SET,  /* Add or modify a meter. */
     OVS_METER_CMD_DEL,  /* Delete a meter. */
     OVS_METER_CMD_GET   /* Get meter stats. */
 };
 
 enum ovs_meter_attr {
     OVS_METER_ATTR_UNSPEC,
     OVS_METER_ATTR_ID,  /* u32 meter ID within datapath. */
     OVS_METER_ATTR_KBPS,    /* No argument. If set, units in kilobits
                  * per second. Otherwise, units in
                  * packets per second.
                  */
     OVS_METER_ATTR_STATS,   /* struct ovs_flow_stats for the meter. */
     OVS_METER_ATTR_BANDS,   /* Nested attributes for meter bands. */
     OVS_METER_ATTR_USED,    /* u64 msecs last used in monotonic time. */
     OVS_METER_ATTR_CLEAR,   /* Flag to clear stats, used. */
     OVS_METER_ATTR_MAX_METERS, /* u32 number of meters supported. */
     OVS_METER_ATTR_MAX_BANDS,  /* u32 max number of bands per meter. */
     OVS_METER_ATTR_PAD,
     __OVS_METER_ATTR_MAX
 };
 
 #define OVS_METER_ATTR_MAX (__OVS_METER_ATTR_MAX - 1)
 
 enum ovs_band_attr {
     OVS_BAND_ATTR_UNSPEC,
     OVS_BAND_ATTR_TYPE, /* u32 OVS_METER_BAND_TYPE_* constant. */
     OVS_BAND_ATTR_RATE, /* u32 band rate in meter units (see above). */
     OVS_BAND_ATTR_BURST,    /* u32 burst size in meter units. */
     OVS_BAND_ATTR_STATS,    /* struct ovs_flow_stats for the band. */
     __OVS_BAND_ATTR_MAX
 };
 
 #define OVS_BAND_ATTR_MAX (__OVS_BAND_ATTR_MAX - 1)
 
 enum ovs_meter_band_type {
     OVS_METER_BAND_TYPE_UNSPEC,
     OVS_METER_BAND_TYPE_DROP,   /* Drop exceeding packets. */
     __OVS_METER_BAND_TYPE_MAX
 };
 
 #define OVS_METER_BAND_TYPE_MAX (__OVS_METER_BAND_TYPE_MAX - 1)
 
 /* Conntrack limit */
 #define OVS_CT_LIMIT_FAMILY  "ovs_ct_limit"
 #define OVS_CT_LIMIT_MCGROUP "ovs_ct_limit"
 #define OVS_CT_LIMIT_VERSION 0x1
 
 enum ovs_ct_limit_cmd {
     OVS_CT_LIMIT_CMD_UNSPEC,
     OVS_CT_LIMIT_CMD_SET,       /* Add or modify ct limit. */
     OVS_CT_LIMIT_CMD_DEL,       /* Delete ct limit. */
     OVS_CT_LIMIT_CMD_GET        /* Get ct limit. */
 };
 
 enum ovs_ct_limit_attr {
     OVS_CT_LIMIT_ATTR_UNSPEC,
     OVS_CT_LIMIT_ATTR_ZONE_LIMIT,   /* Nested struct ovs_zone_limit. */
     __OVS_CT_LIMIT_ATTR_MAX
 };
 
 #define OVS_CT_LIMIT_ATTR_MAX (__OVS_CT_LIMIT_ATTR_MAX - 1)
 
 #define OVS_ZONE_LIMIT_DEFAULT_ZONE -1
 
 struct ovs_zone_limit {
     int zone_id;
     __u32 limit;
     __u32 count;
 };
 
 enum ovs_dec_ttl_attr {
     OVS_DEC_TTL_ATTR_UNSPEC,
     OVS_DEC_TTL_ATTR_ACTION,    /* Nested struct nlattr */
     __OVS_DEC_TTL_ATTR_MAX
 };
 
 #define OVS_DEC_TTL_ATTR_MAX (__OVS_DEC_TTL_ATTR_MAX - 1)
 
 #endif /* _LINUX_OPENVSWITCH_H */

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