text: /*
   * Copyright (c) 2007-2014 Nicira, Inc.
   *
   * This file is offered under your choice of two licenses: Apache 2.0 or GNU
   * GPL 2.0 or later.  The permission statements for each of these licenses is
   * given below.  You may license your modifications to this file under either
   * of these licenses or both.  If you wish to license your modifications under
   * only one of these licenses, delete the permission text for the other
   * license.
   *
   * ----------------------------------------------------------------------
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at:
   *
   *     http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   * ----------------------------------------------------------------------
   * 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 _LINUX_OPENVSWITCH_H
  #define _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_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_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 pad1;		 /* Pad for future expension. */
  	__u64 pad2;		 /* 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)
  
  /* 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.
   * @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.
   *
   * 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_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_GRE64 = 104, /* GRE tunnel with 64-bit keys */
  	OVS_VPORT_TYPE_LISP = 105,  /* LISP 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 Netlink socket in userspace that
   * OVS_PACKET_CMD_MISS upcalls will be directed to for packets received on
   * this port.  A value of zero indicates that 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.  %OVS_VPORT_ATTR_STATS is optional and other attributes are
   * ignored.
   *
   * 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, /* u32 Netlink PID to receive upcalls */
  	OVS_VPORT_ATTR_STATS,	/* struct ovs_vport_stats */
  	__OVS_VPORT_ATTR_MAX
  };
  
  #define OVS_VPORT_ATTR_MAX (__OVS_VPORT_ATTR_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_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. */
  
  #ifdef __KERNEL__
  	OVS_KEY_ATTR_IPV4_TUNNEL,  /* struct ovs_key_ipv4_tunnel */
  #endif
  
  	OVS_KEY_ATTR_MPLS = 62, /* array of struct ovs_key_mpls.
  				 * The implementation may restrict
  				 * the accepted length of the array. */
  	__OVS_KEY_ATTR_MAX
  };
  
  #define OVS_KEY_ATTR_MAX (__OVS_KEY_ATTR_MAX - 1)
  
  enum ovs_tunnel_key_attr {
  	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_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_*. */
  };
  
  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 {
  	__u32 nd_target[4];
  	__u8  nd_sll[ETH_ALEN];
  	__u8  nd_tll[ETH_ALEN];
  };
  
  /**
   * 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.
   * @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.
   *
   * 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_MAX
  };
  
  #define OVS_FLOW_ATTR_MAX (__OVS_FLOW_ATTR_MAX - 1)
  
  /**
   * 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,
  };
  
  #define OVS_SAMPLE_ATTR_MAX (__OVS_SAMPLE_ATTR_MAX - 1)
  
  /**
   * 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.
   */
  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_MAX
  };
  
  #define OVS_USERSPACE_ATTR_MAX (__OVS_USERSPACE_ATTR_MAX - 1)
  
  /**
   * 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_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.  The only acceptable TPID
   * values are those that the kernel module also parses as 802.1Q 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 TPID. */
  	__be16 vlan_tci;	/* 802.1Q TCI (VLAN ID and priority). */
  };
  
  /**
   * enum ovs_action_attr - Action types.
   *
   * @OVS_ACTION_ATTR_OUTPUT: Output packet to port.
   * @OVS_ACTION_ATTR_USERSPACE: Send packet to userspace according to nested
   * %OVS_USERSPACE_ATTR_* attributes.
   * @OVS_ACTION_ATTR_PUSH_VLAN: Push a new outermost 802.1Q header onto the
   * packet.
   * @OVS_ACTION_ATTR_POP_VLAN: Pop the outermost 802.1Q header off the packet.
   * @OVS_ACTION_ATTR_SAMPLE: Probabilitically executes actions, as specified in
   * the nested %OVS_SAMPLE_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_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.
   *
   * 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.
   */
  
  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_PUSH_MPLS,    /* struct ovs_action_push_mpls. */
  	OVS_ACTION_ATTR_POP_MPLS,     /* __be16 ethertype. */
  	__OVS_ACTION_ATTR_MAX
  };
  
  #define OVS_ACTION_ATTR_MAX (__OVS_ACTION_ATTR_MAX - 1)
  
  #endif /* _LINUX_OPENVSWITCH_H */
  