openvswitch: Expose <linux/openvswitch.h> to userspace

It contains the public netlink interface bits required by userspace to
make use of the interface.

Signed-off-by: Thomas Graf <tgraf@suug.ch>
Signed-off-by: Jesse Gross <jesse@nicira.com>

3 files changed, 458 insertions, 432 deletions

diff --git a/include/linux/openvswitch.h b/include/linux/openvswitch.h
index 8b9d7217edd..e6b240b6196 100644
--- a/include/linux/openvswitch.h
+++ b/include/linux/openvswitch.h
@@ -19,437 +19,6 @@
 #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"
-#define OVS_DATAPATH_VERSION 0x1
-
-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.
- *
- * 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_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_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  */
-};
-
-/* 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_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.
- * 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)
-
-/* 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_MAX
-};
-
-#define OVS_KEY_ATTR_MAX (__OVS_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_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_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.
- *
- * 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_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_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_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_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.
- *
- * 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_MAX
-};
-
-#define OVS_ACTION_ATTR_MAX (__OVS_ACTION_ATTR_MAX - 1)
+#include <uapi/linux/openvswitch.h>
 
 #endif /* _LINUX_OPENVSWITCH_H */
diff --git a/include/uapi/linux/Kbuild b/include/uapi/linux/Kbuild
index 5c8a1d25e21..d8fbc6aeac8 100644
--- a/include/uapi/linux/Kbuild
+++ b/include/uapi/linux/Kbuild
@@ -285,6 +285,7 @@ header-y += nvram.h
 header-y += omap3isp.h
 header-y += omapfb.h
 header-y += oom.h
+header-y += openvswitch.h
 header-y += packet_diag.h
 header-y += param.h
 header-y += parport.h
diff --git a/include/uapi/linux/openvswitch.h b/include/uapi/linux/openvswitch.h
new file mode 100644
index 00000000000..405918dd7b3
--- /dev/null
+++ b/include/uapi/linux/openvswitch.h
@@ -0,0 +1,456 @@
+
+/*
+ * Copyright (c) 2007-2011 Nicira Networks.
+ *
+ * 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"
+#define OVS_DATAPATH_VERSION 0x1
+
+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.
+ *
+ * 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_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_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  */
+};
+
+/* 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_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.
+ * 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)
+
+/* 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_MAX
+};
+
+#define OVS_KEY_ATTR_MAX (__OVS_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_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_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.
+ *
+ * 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_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_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_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_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.
+ *
+ * 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_MAX
+};
+
+#define OVS_ACTION_ATTR_MAX (__OVS_ACTION_ATTR_MAX - 1)
+
+#endif /* _LINUX_OPENVSWITCH_H */