include/linux/openvswitch.h

   1 /*
   2  * Copyright (c) 2007-2011 Nicira Networks.
   3  *
   4  * This program is free software; you can redistribute it and/or
   5  * modify it under the terms of version 2 of the GNU General Public
   6  * License as published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope that it will be useful, but
   9  * WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  11  * General Public License for more details.
  12  *
  13  * You should have received a copy of the GNU General Public License
  14  * along with this program; if not, write to the Free Software
  15  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  16  * 02110-1301, USA
  17  */
  18
  19 #ifndef _LINUX_OPENVSWITCH_H
  20 #define _LINUX_OPENVSWITCH_H 1
  21
  22 #include <linux/types.h>
  23
  24 /**
  25  * struct ovs_header - header for OVS Generic Netlink messages.
  26  * @dp_ifindex: ifindex of local port for datapath (0 to make a request not
  27  * specific to a datapath).
  28  *
  29  * Attributes following the header are specific to a particular OVS Generic
  30  * Netlink family, but all of the OVS families use this header.
  31  */
  32
  33 struct ovs_header {
  34         int dp_ifindex;
  35 };
  36
  37 /* Datapaths. */
  38
  39 #define OVS_DATAPATH_FAMILY  "ovs_datapath"
  40 #define OVS_DATAPATH_MCGROUP "ovs_datapath"
  41 #define OVS_DATAPATH_VERSION 0x1
  42
  43 enum ovs_datapath_cmd {
  44         OVS_DP_CMD_UNSPEC,
  45         OVS_DP_CMD_NEW,
  46         OVS_DP_CMD_DEL,
  47         OVS_DP_CMD_GET,
  48         OVS_DP_CMD_SET
  49 };
  50
  51 /**
  52  * enum ovs_datapath_attr - attributes for %OVS_DP_* commands.
  53  * @OVS_DP_ATTR_NAME: Name of the network device that serves as the "local
  54  * port".  This is the name of the network device whose dp_ifindex is given in
  55  * the &struct ovs_header.  Always present in notifications.  Required in
  56  * %OVS_DP_NEW requests.  May be used as an alternative to specifying
  57  * dp_ifindex in other requests (with a dp_ifindex of 0).
  58  * @OVS_DP_ATTR_UPCALL_PID: The Netlink socket in userspace that is initially
  59  * set on the datapath port (for OVS_ACTION_ATTR_MISS).  Only valid on
  60  * %OVS_DP_CMD_NEW requests. A value of zero indicates that upcalls should
  61  * not be sent.
  62  * @OVS_DP_ATTR_STATS: Statistics about packets that have passed through the
  63  * datapath.  Always present in notifications.
  64  *
  65  * These attributes follow the &struct ovs_header within the Generic Netlink
  66  * payload for %OVS_DP_* commands.
  67  */
  68 enum ovs_datapath_attr {
  69         OVS_DP_ATTR_UNSPEC,
  70         OVS_DP_ATTR_NAME,       /* name of dp_ifindex netdev */
  71         OVS_DP_ATTR_UPCALL_PID, /* Netlink PID to receive upcalls */
  72         OVS_DP_ATTR_STATS,      /* struct ovs_dp_stats */
  73         __OVS_DP_ATTR_MAX
  74 };
  75
  76 #define OVS_DP_ATTR_MAX (__OVS_DP_ATTR_MAX - 1)
  77
  78 struct ovs_dp_stats {
  79         __u64 n_hit;             /* Number of flow table matches. */
  80         __u64 n_missed;          /* Number of flow table misses. */
  81         __u64 n_lost;            /* Number of misses not sent to userspace. */
  82         __u64 n_flows;           /* Number of flows present */
  83 };
  84
  85 struct ovs_vport_stats {
  86         __u64   rx_packets;             /* total packets received       */
  87         __u64   tx_packets;             /* total packets transmitted    */
  88         __u64   rx_bytes;               /* total bytes received         */
  89         __u64   tx_bytes;               /* total bytes transmitted      */
  90         __u64   rx_errors;              /* bad packets received         */
  91         __u64   tx_errors;              /* packet transmit problems     */
  92         __u64   rx_dropped;             /* no space in linux buffers    */
  93         __u64   tx_dropped;             /* no space available in linux  */
  94 };
  95
  96 /* Fixed logical ports. */
  97 #define OVSP_LOCAL      ((__u16)0)
  98
  99 /* Packet transfer. */
 100
 101 #define OVS_PACKET_FAMILY "ovs_packet"
 102 #define OVS_PACKET_VERSION 0x1
 103
 104 enum ovs_packet_cmd {
 105         OVS_PACKET_CMD_UNSPEC,
 106
 107         /* Kernel-to-user notifications. */
 108         OVS_PACKET_CMD_MISS,    /* Flow table miss. */
 109         OVS_PACKET_CMD_ACTION,  /* OVS_ACTION_ATTR_USERSPACE action. */
 110
 111         /* Userspace commands. */
 112         OVS_PACKET_CMD_EXECUTE  /* Apply actions to a packet. */
 113 };
 114
 115 /**
 116  * enum ovs_packet_attr - attributes for %OVS_PACKET_* commands.
 117  * @OVS_PACKET_ATTR_PACKET: Present for all notifications.  Contains the entire
 118  * packet as received, from the start of the Ethernet header onward.  For
 119  * %OVS_PACKET_CMD_ACTION, %OVS_PACKET_ATTR_PACKET reflects changes made by
 120  * actions preceding %OVS_ACTION_ATTR_USERSPACE, but %OVS_PACKET_ATTR_KEY is
 121  * the flow key extracted from the packet as originally received.
 122  * @OVS_PACKET_ATTR_KEY: Present for all notifications.  Contains the flow key
 123  * extracted from the packet as nested %OVS_KEY_ATTR_* attributes.  This allows
 124  * userspace to adapt its flow setup strategy by comparing its notion of the
 125  * flow key against the kernel's.
 126  * @OVS_PACKET_ATTR_ACTIONS: Contains actions for the packet.  Used
 127  * for %OVS_PACKET_CMD_EXECUTE.  It has nested %OVS_ACTION_ATTR_* attributes.
 128  * @OVS_PACKET_ATTR_USERDATA: Present for an %OVS_PACKET_CMD_ACTION
 129  * notification if the %OVS_ACTION_ATTR_USERSPACE action specified an
 130  * %OVS_USERSPACE_ATTR_USERDATA attribute.
 131  *
 132  * These attributes follow the &struct ovs_header within the Generic Netlink
 133  * payload for %OVS_PACKET_* commands.
 134  */
 135 enum ovs_packet_attr {
 136         OVS_PACKET_ATTR_UNSPEC,
 137         OVS_PACKET_ATTR_PACKET,      /* Packet data. */
 138         OVS_PACKET_ATTR_KEY,         /* Nested OVS_KEY_ATTR_* attributes. */
 139         OVS_PACKET_ATTR_ACTIONS,     /* Nested OVS_ACTION_ATTR_* attributes. */
 140         OVS_PACKET_ATTR_USERDATA,    /* u64 OVS_ACTION_ATTR_USERSPACE arg. */
 141         __OVS_PACKET_ATTR_MAX
 142 };
 143
 144 #define OVS_PACKET_ATTR_MAX (__OVS_PACKET_ATTR_MAX - 1)
 145
 146 /* Virtual ports. */
 147
 148 #define OVS_VPORT_FAMILY  "ovs_vport"
 149 #define OVS_VPORT_MCGROUP "ovs_vport"
 150 #define OVS_VPORT_VERSION 0x1
 151
 152 enum ovs_vport_cmd {
 153         OVS_VPORT_CMD_UNSPEC,
 154         OVS_VPORT_CMD_NEW,
 155         OVS_VPORT_CMD_DEL,
 156         OVS_VPORT_CMD_GET,
 157         OVS_VPORT_CMD_SET
 158 };
 159
 160 enum ovs_vport_type {
 161         OVS_VPORT_TYPE_UNSPEC,
 162         OVS_VPORT_TYPE_NETDEV,   /* network device */
 163         OVS_VPORT_TYPE_INTERNAL, /* network device implemented by datapath */
 164         __OVS_VPORT_TYPE_MAX
 165 };
 166
 167 #define OVS_VPORT_TYPE_MAX (__OVS_VPORT_TYPE_MAX - 1)
 168
 169 /**
 170  * enum ovs_vport_attr - attributes for %OVS_VPORT_* commands.
 171  * @OVS_VPORT_ATTR_PORT_NO: 32-bit port number within datapath.
 172  * @OVS_VPORT_ATTR_TYPE: 32-bit %OVS_VPORT_TYPE_* constant describing the type
 173  * of vport.
 174  * @OVS_VPORT_ATTR_NAME: Name of vport.  For a vport based on a network device
 175  * this is the name of the network device.  Maximum length %IFNAMSIZ-1 bytes
 176  * plus a null terminator.
 177  * @OVS_VPORT_ATTR_OPTIONS: Vport-specific configuration information.
 178  * @OVS_VPORT_ATTR_UPCALL_PID: The Netlink socket in userspace that
 179  * OVS_PACKET_CMD_MISS upcalls will be directed to for packets received on
 180  * this port.  A value of zero indicates that upcalls should not be sent.
 181  * @OVS_VPORT_ATTR_STATS: A &struct ovs_vport_stats giving statistics for
 182  * packets sent or received through the vport.
 183  *
 184  * These attributes follow the &struct ovs_header within the Generic Netlink
 185  * payload for %OVS_VPORT_* commands.
 186  *
 187  * For %OVS_VPORT_CMD_NEW requests, the %OVS_VPORT_ATTR_TYPE and
 188  * %OVS_VPORT_ATTR_NAME attributes are required.  %OVS_VPORT_ATTR_PORT_NO is
 189  * optional; if not specified a free port number is automatically selected.
 190  * Whether %OVS_VPORT_ATTR_OPTIONS is required or optional depends on the type
 191  * of vport.
 192  * and other attributes are ignored.
 193  *
 194  * For other requests, if %OVS_VPORT_ATTR_NAME is specified then it is used to
 195  * look up the vport to operate on; otherwise dp_idx from the &struct
 196  * ovs_header plus %OVS_VPORT_ATTR_PORT_NO determine the vport.
 197  */
 198 enum ovs_vport_attr {
 199         OVS_VPORT_ATTR_UNSPEC,
 200         OVS_VPORT_ATTR_PORT_NO, /* u32 port number within datapath */
 201         OVS_VPORT_ATTR_TYPE,    /* u32 OVS_VPORT_TYPE_* constant. */
 202         OVS_VPORT_ATTR_NAME,    /* string name, up to IFNAMSIZ bytes long */
 203         OVS_VPORT_ATTR_OPTIONS, /* nested attributes, varies by vport type */
 204         OVS_VPORT_ATTR_UPCALL_PID, /* u32 Netlink PID to receive upcalls */
 205         OVS_VPORT_ATTR_STATS,   /* struct ovs_vport_stats */
 206         __OVS_VPORT_ATTR_MAX
 207 };
 208
 209 #define OVS_VPORT_ATTR_MAX (__OVS_VPORT_ATTR_MAX - 1)
 210
 211 /* Flows. */
 212
 213 #define OVS_FLOW_FAMILY  "ovs_flow"
 214 #define OVS_FLOW_MCGROUP "ovs_flow"
 215 #define OVS_FLOW_VERSION 0x1
 216
 217 enum ovs_flow_cmd {
 218         OVS_FLOW_CMD_UNSPEC,
 219         OVS_FLOW_CMD_NEW,
 220         OVS_FLOW_CMD_DEL,
 221         OVS_FLOW_CMD_GET,
 222         OVS_FLOW_CMD_SET
 223 };
 224
 225 struct ovs_flow_stats {
 226         __u64 n_packets;         /* Number of matched packets. */
 227         __u64 n_bytes;           /* Number of matched bytes. */
 228 };
 229
 230 enum ovs_key_attr {
 231         OVS_KEY_ATTR_UNSPEC,
 232         OVS_KEY_ATTR_ENCAP,     /* Nested set of encapsulated attributes. */
 233         OVS_KEY_ATTR_PRIORITY,  /* u32 skb->priority */
 234         OVS_KEY_ATTR_IN_PORT,   /* u32 OVS dp port number */
 235         OVS_KEY_ATTR_ETHERNET,  /* struct ovs_key_ethernet */
 236         OVS_KEY_ATTR_VLAN,      /* be16 VLAN TCI */
 237         OVS_KEY_ATTR_ETHERTYPE, /* be16 Ethernet type */
 238         OVS_KEY_ATTR_IPV4,      /* struct ovs_key_ipv4 */
 239         OVS_KEY_ATTR_IPV6,      /* struct ovs_key_ipv6 */
 240         OVS_KEY_ATTR_TCP,       /* struct ovs_key_tcp */
 241         OVS_KEY_ATTR_UDP,       /* struct ovs_key_udp */
 242         OVS_KEY_ATTR_ICMP,      /* struct ovs_key_icmp */
 243         OVS_KEY_ATTR_ICMPV6,    /* struct ovs_key_icmpv6 */
 244         OVS_KEY_ATTR_ARP,       /* struct ovs_key_arp */
 245         OVS_KEY_ATTR_ND,        /* struct ovs_key_nd */
 246         OVS_KEY_ATTR_SKB_MARK,  /* u32 skb mark */
 247         __OVS_KEY_ATTR_MAX
 248 };
 249
 250 #define OVS_KEY_ATTR_MAX (__OVS_KEY_ATTR_MAX - 1)
 251
 252 /**
 253  * enum ovs_frag_type - IPv4 and IPv6 fragment type
 254  * @OVS_FRAG_TYPE_NONE: Packet is not a fragment.
 255  * @OVS_FRAG_TYPE_FIRST: Packet is a fragment with offset 0.
 256  * @OVS_FRAG_TYPE_LATER: Packet is a fragment with nonzero offset.
 257  *
 258  * Used as the @ipv4_frag in &struct ovs_key_ipv4 and as @ipv6_frag &struct
 259  * ovs_key_ipv6.
 260  */
 261 enum ovs_frag_type {
 262         OVS_FRAG_TYPE_NONE,
 263         OVS_FRAG_TYPE_FIRST,
 264         OVS_FRAG_TYPE_LATER,
 265         __OVS_FRAG_TYPE_MAX
 266 };
 267
 268 #define OVS_FRAG_TYPE_MAX (__OVS_FRAG_TYPE_MAX - 1)
 269
 270 struct ovs_key_ethernet {
 271         __u8     eth_src[6];
 272         __u8     eth_dst[6];
 273 };
 274
 275 struct ovs_key_ipv4 {
 276         __be32 ipv4_src;
 277         __be32 ipv4_dst;
 278         __u8   ipv4_proto;
 279         __u8   ipv4_tos;
 280         __u8   ipv4_ttl;
 281         __u8   ipv4_frag;       /* One of OVS_FRAG_TYPE_*. */
 282 };
 283
 284 struct ovs_key_ipv6 {
 285         __be32 ipv6_src[4];
 286         __be32 ipv6_dst[4];
 287         __be32 ipv6_label;      /* 20-bits in least-significant bits. */
 288         __u8   ipv6_proto;
 289         __u8   ipv6_tclass;
 290         __u8   ipv6_hlimit;
 291         __u8   ipv6_frag;       /* One of OVS_FRAG_TYPE_*. */
 292 };
 293
 294 struct ovs_key_tcp {
 295         __be16 tcp_src;
 296         __be16 tcp_dst;
 297 };
 298
 299 struct ovs_key_udp {
 300         __be16 udp_src;
 301         __be16 udp_dst;
 302 };
 303
 304 struct ovs_key_icmp {
 305         __u8 icmp_type;
 306         __u8 icmp_code;
 307 };
 308
 309 struct ovs_key_icmpv6 {
 310         __u8 icmpv6_type;
 311         __u8 icmpv6_code;
 312 };
 313
 314 struct ovs_key_arp {
 315         __be32 arp_sip;
 316         __be32 arp_tip;
 317         __be16 arp_op;
 318         __u8   arp_sha[6];
 319         __u8   arp_tha[6];
 320 };
 321
 322 struct ovs_key_nd {
 323         __u32 nd_target[4];
 324         __u8  nd_sll[6];
 325         __u8  nd_tll[6];
 326 };
 327
 328 /**
 329  * enum ovs_flow_attr - attributes for %OVS_FLOW_* commands.
 330  * @OVS_FLOW_ATTR_KEY: Nested %OVS_KEY_ATTR_* attributes specifying the flow
 331  * key.  Always present in notifications.  Required for all requests (except
 332  * dumps).
 333  * @OVS_FLOW_ATTR_ACTIONS: Nested %OVS_ACTION_ATTR_* attributes specifying
 334  * the actions to take for packets that match the key.  Always present in
 335  * notifications.  Required for %OVS_FLOW_CMD_NEW requests, optional for
 336  * %OVS_FLOW_CMD_SET requests.
 337  * @OVS_FLOW_ATTR_STATS: &struct ovs_flow_stats giving statistics for this
 338  * flow.  Present in notifications if the stats would be nonzero.  Ignored in
 339  * requests.
 340  * @OVS_FLOW_ATTR_TCP_FLAGS: An 8-bit value giving the OR'd value of all of the
 341  * TCP flags seen on packets in this flow.  Only present in notifications for
 342  * TCP flows, and only if it would be nonzero.  Ignored in requests.
 343  * @OVS_FLOW_ATTR_USED: A 64-bit integer giving the time, in milliseconds on
 344  * the system monotonic clock, at which a packet was last processed for this
 345  * flow.  Only present in notifications if a packet has been processed for this
 346  * flow.  Ignored in requests.
 347  * @OVS_FLOW_ATTR_CLEAR: If present in a %OVS_FLOW_CMD_SET request, clears the
 348  * last-used time, accumulated TCP flags, and statistics for this flow.
 349  * Otherwise ignored in requests.  Never present in notifications.
 350  *
 351  * These attributes follow the &struct ovs_header within the Generic Netlink
 352  * payload for %OVS_FLOW_* commands.
 353  */
 354 enum ovs_flow_attr {
 355         OVS_FLOW_ATTR_UNSPEC,
 356         OVS_FLOW_ATTR_KEY,       /* Sequence of OVS_KEY_ATTR_* attributes. */
 357         OVS_FLOW_ATTR_ACTIONS,   /* Nested OVS_ACTION_ATTR_* attributes. */
 358         OVS_FLOW_ATTR_STATS,     /* struct ovs_flow_stats. */
 359         OVS_FLOW_ATTR_TCP_FLAGS, /* 8-bit OR'd TCP flags. */
 360         OVS_FLOW_ATTR_USED,      /* u64 msecs last used in monotonic time. */
 361         OVS_FLOW_ATTR_CLEAR,     /* Flag to clear stats, tcp_flags, used. */
 362         __OVS_FLOW_ATTR_MAX
 363 };
 364
 365 #define OVS_FLOW_ATTR_MAX (__OVS_FLOW_ATTR_MAX - 1)
 366
 367 /**
 368  * enum ovs_sample_attr - Attributes for %OVS_ACTION_ATTR_SAMPLE action.
 369  * @OVS_SAMPLE_ATTR_PROBABILITY: 32-bit fraction of packets to sample with
 370  * @OVS_ACTION_ATTR_SAMPLE.  A value of 0 samples no packets, a value of
 371  * %UINT32_MAX samples all packets and intermediate values sample intermediate
 372  * fractions of packets.
 373  * @OVS_SAMPLE_ATTR_ACTIONS: Set of actions to execute in sampling event.
 374  * Actions are passed as nested attributes.
 375  *
 376  * Executes the specified actions with the given probability on a per-packet
 377  * basis.
 378  */
 379 enum ovs_sample_attr {
 380         OVS_SAMPLE_ATTR_UNSPEC,
 381         OVS_SAMPLE_ATTR_PROBABILITY, /* u32 number */
 382         OVS_SAMPLE_ATTR_ACTIONS,     /* Nested OVS_ACTION_ATTR_* attributes. */
 383         __OVS_SAMPLE_ATTR_MAX,
 384 };
 385
 386 #define OVS_SAMPLE_ATTR_MAX (__OVS_SAMPLE_ATTR_MAX - 1)
 387
 388 /**
 389  * enum ovs_userspace_attr - Attributes for %OVS_ACTION_ATTR_USERSPACE action.
 390  * @OVS_USERSPACE_ATTR_PID: u32 Netlink PID to which the %OVS_PACKET_CMD_ACTION
 391  * message should be sent.  Required.
 392  * @OVS_USERSPACE_ATTR_USERDATA: If present, its u64 argument is copied to the
 393  * %OVS_PACKET_CMD_ACTION message as %OVS_PACKET_ATTR_USERDATA,
 394  */
 395 enum ovs_userspace_attr {
 396         OVS_USERSPACE_ATTR_UNSPEC,
 397         OVS_USERSPACE_ATTR_PID,       /* u32 Netlink PID to receive upcalls. */
 398         OVS_USERSPACE_ATTR_USERDATA,  /* u64 optional user-specified cookie. */
 399         __OVS_USERSPACE_ATTR_MAX
 400 };
 401
 402 #define OVS_USERSPACE_ATTR_MAX (__OVS_USERSPACE_ATTR_MAX - 1)
 403
 404 /**
 405  * struct ovs_action_push_vlan - %OVS_ACTION_ATTR_PUSH_VLAN action argument.
 406  * @vlan_tpid: Tag protocol identifier (TPID) to push.
 407  * @vlan_tci: Tag control identifier (TCI) to push.  The CFI bit must be set
 408  * (but it will not be set in the 802.1Q header that is pushed).
 409  *
 410  * The @vlan_tpid value is typically %ETH_P_8021Q.  The only acceptable TPID
 411  * values are those that the kernel module also parses as 802.1Q headers, to
 412  * prevent %OVS_ACTION_ATTR_PUSH_VLAN followed by %OVS_ACTION_ATTR_POP_VLAN
 413  * from having surprising results.
 414  */
 415 struct ovs_action_push_vlan {
 416         __be16 vlan_tpid;       /* 802.1Q TPID. */
 417         __be16 vlan_tci;        /* 802.1Q TCI (VLAN ID and priority). */
 418 };
 419
 420 /**
 421  * enum ovs_action_attr - Action types.
 422  *
 423  * @OVS_ACTION_ATTR_OUTPUT: Output packet to port.
 424  * @OVS_ACTION_ATTR_USERSPACE: Send packet to userspace according to nested
 425  * %OVS_USERSPACE_ATTR_* attributes.
 426  * @OVS_ACTION_ATTR_SET: Replaces the contents of an existing header.  The
 427  * single nested %OVS_KEY_ATTR_* attribute specifies a header to modify and its
 428  * value.
 429  * @OVS_ACTION_ATTR_PUSH_VLAN: Push a new outermost 802.1Q header onto the
 430  * packet.
 431  * @OVS_ACTION_ATTR_POP_VLAN: Pop the outermost 802.1Q header off the packet.
 432  * @OVS_ACTION_ATTR_SAMPLE: Probabilitically executes actions, as specified in
 433  * the nested %OVS_SAMPLE_ATTR_* attributes.
 434  *
 435  * Only a single header can be set with a single %OVS_ACTION_ATTR_SET.  Not all
 436  * fields within a header are modifiable, e.g. the IPv4 protocol and fragment
 437  * type may not be changed.
 438  */
 439
 440 enum ovs_action_attr {
 441         OVS_ACTION_ATTR_UNSPEC,
 442         OVS_ACTION_ATTR_OUTPUT,       /* u32 port number. */
 443         OVS_ACTION_ATTR_USERSPACE,    /* Nested OVS_USERSPACE_ATTR_*. */
 444         OVS_ACTION_ATTR_SET,          /* One nested OVS_KEY_ATTR_*. */
 445         OVS_ACTION_ATTR_PUSH_VLAN,    /* struct ovs_action_push_vlan. */
 446         OVS_ACTION_ATTR_POP_VLAN,     /* No argument. */
 447         OVS_ACTION_ATTR_SAMPLE,       /* Nested OVS_SAMPLE_ATTR_*. */
 448         __OVS_ACTION_ATTR_MAX
 449 };
 450
 451 #define OVS_ACTION_ATTR_MAX (__OVS_ACTION_ATTR_MAX - 1)
 452
 453 #endif /* _LINUX_OPENVSWITCH_H */