The Tcpdump Group git mirrors - tcpdump/blob - openflow-1.0.h

   1 /* Copyright (c) 2008 The Board of Trustees of The Leland Stanford
   2  * Junior University
   3  *
   4  * We are making the OpenFlow specification and associated documentation
   5  * (Software) available for public use and benefit with the expectation
   6  * that others will use, modify and enhance the Software and contribute
   7  * those enhancements back to the community. However, since we would
   8  * like to make the Software available for broadest use, with as few
   9  * restrictions as possible permission is hereby granted, free of
  10  * charge, to any person obtaining a copy of this Software to deal in
  11  * the Software under the copyrights without restriction, including
  12  * without limitation the rights to use, copy, modify, merge, publish,
  13  * distribute, sublicense, and/or sell copies of the Software, and to
  14  * permit persons to whom the Software is furnished to do so, subject to
  15  * the following conditions:
  16  *
  17  * The above copyright notice and this permission notice shall be
  18  * included in all copies or substantial portions of the Software.
  19  *
  20  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  21  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  22  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  23  * NONINFRINGEMENT.  IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  24  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  25  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  26  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  27  * SOFTWARE.
  28  *
  29  * The name and trademarks of copyright holder(s) may NOT be used in
  30  * advertising or publicity pertaining to the Software or any
  31  * derivatives without specific, written prior permission.
  32  */
  33
  34 /* OpenFlow: protocol between controller and datapath. */
  35
  36 #ifndef OPENFLOW_OPENFLOW_H
  37 #define OPENFLOW_OPENFLOW_H 1
  38
  39 #ifdef __KERNEL__
  40 #include <linux/types.h>
  41 #else
  42 #include <stdint.h>
  43 #endif
  44
  45 #ifdef SWIG
  46 #define OFP_ASSERT(EXPR)        /* SWIG can't handle OFP_ASSERT. */
  47 #elif !defined(__cplusplus)
  48 /* Build-time assertion for use in a declaration context. */
  49 #define OFP_ASSERT(EXPR)                                                \
  50         extern int (*build_assert(void))[ sizeof(struct {               \
  51                     unsigned int build_assert_failed : (EXPR) ? 1 : -1; })]
  52 #else /* __cplusplus */
  53 #define OFP_ASSERT(_EXPR) typedef int build_assert_failed[(_EXPR) ? 1 : -1]
  54 #endif /* __cplusplus */
  55
  56 #ifndef SWIG
  57 #define OFP_PACKED __attribute__((packed))
  58 #else
  59 #define OFP_PACKED              /* SWIG doesn't understand __attribute. */
  60 #endif
  61
  62 /* Version number:
  63  * Non-experimental versions released: 0x01
  64  * Experimental versions released: 0x81 -- 0x99
  65  */
  66 /* The most significant bit being set in the version field indicates an
  67  * experimental OpenFlow version.
  68  */
  69 #define OFP_VERSION   0x01
  70
  71 #define OFP_MAX_TABLE_NAME_LEN 32
  72 #define OFP_MAX_PORT_NAME_LEN  16
  73
  74 #define OFP_TCP_PORT  6633
  75 #define OFP_SSL_PORT  6633
  76
  77 #define OFP_ETH_ALEN 6          /* Bytes in an Ethernet address. */
  78
  79 /* Port numbering.  Physical ports are numbered starting from 1. */
  80 enum ofp_port {
  81     /* Maximum number of physical switch ports. */
  82     OFPP_MAX = 0xff00,
  83
  84     /* Fake output "ports". */
  85     OFPP_IN_PORT    = 0xfff8,  /* Send the packet out the input port.  This
  86                                   virtual port must be explicitly used
  87                                   in order to send back out of the input
  88                                   port. */
  89     OFPP_TABLE      = 0xfff9,  /* Perform actions in flow table.
  90                                   NB: This can only be the destination
  91                                   port for packet-out messages. */
  92     OFPP_NORMAL     = 0xfffa,  /* Process with normal L2/L3 switching. */
  93     OFPP_FLOOD      = 0xfffb,  /* All physical ports except input port and
  94                                   those disabled by STP. */
  95     OFPP_ALL        = 0xfffc,  /* All physical ports except input port. */
  96     OFPP_CONTROLLER = 0xfffd,  /* Send to controller. */
  97     OFPP_LOCAL      = 0xfffe,  /* Local openflow "port". */
  98     OFPP_NONE       = 0xffff   /* Not associated with a physical port. */
  99 };
 100
 101 enum ofp_type {
 102     /* Immutable messages. */
 103     OFPT_HELLO,               /* Symmetric message */
 104     OFPT_ERROR,               /* Symmetric message */
 105     OFPT_ECHO_REQUEST,        /* Symmetric message */
 106     OFPT_ECHO_REPLY,          /* Symmetric message */
 107     OFPT_VENDOR,              /* Symmetric message */
 108
 109     /* Switch configuration messages. */
 110     OFPT_FEATURES_REQUEST,    /* Controller/switch message */
 111     OFPT_FEATURES_REPLY,      /* Controller/switch message */
 112     OFPT_GET_CONFIG_REQUEST,  /* Controller/switch message */
 113     OFPT_GET_CONFIG_REPLY,    /* Controller/switch message */
 114     OFPT_SET_CONFIG,          /* Controller/switch message */
 115
 116     /* Asynchronous messages. */
 117     OFPT_PACKET_IN,           /* Async message */
 118     OFPT_FLOW_REMOVED,        /* Async message */
 119     OFPT_PORT_STATUS,         /* Async message */
 120
 121     /* Controller command messages. */
 122     OFPT_PACKET_OUT,          /* Controller/switch message */
 123     OFPT_FLOW_MOD,            /* Controller/switch message */
 124     OFPT_PORT_MOD,            /* Controller/switch message */
 125
 126     /* Statistics messages. */
 127     OFPT_STATS_REQUEST,       /* Controller/switch message */
 128     OFPT_STATS_REPLY,         /* Controller/switch message */
 129
 130     /* Barrier messages. */
 131     OFPT_BARRIER_REQUEST,     /* Controller/switch message */
 132     OFPT_BARRIER_REPLY,       /* Controller/switch message */
 133
 134     /* Queue Configuration messages. */
 135     OFPT_QUEUE_GET_CONFIG_REQUEST,  /* Controller/switch message */
 136     OFPT_QUEUE_GET_CONFIG_REPLY     /* Controller/switch message */
 137
 138 };
 139
 140 /* Header on all OpenFlow packets. */
 141 struct ofp_header {
 142     uint8_t version;    /* OFP_VERSION. */
 143     uint8_t type;       /* One of the OFPT_ constants. */
 144     uint16_t length;    /* Length including this ofp_header. */
 145     uint32_t xid;       /* Transaction id associated with this packet.
 146                            Replies use the same id as was in the request
 147                            to facilitate pairing. */
 148 };
 149 OFP_ASSERT(sizeof(struct ofp_header) == 8);
 150
 151 /* OFPT_HELLO.  This message has an empty body, but implementations must
 152  * ignore any data included in the body, to allow for future extensions. */
 153 struct ofp_hello {
 154     struct ofp_header header;
 155 };
 156
 157 #define OFP_DEFAULT_MISS_SEND_LEN   128
 158
 159 enum ofp_config_flags {
 160     /* Handling of IP fragments. */
 161     OFPC_FRAG_NORMAL   = 0,  /* No special handling for fragments. */
 162     OFPC_FRAG_DROP     = 1,  /* Drop fragments. */
 163     OFPC_FRAG_REASM    = 2,  /* Reassemble (only if OFPC_IP_REASM set). */
 164     OFPC_FRAG_MASK     = 3
 165 };
 166
 167 /* Switch configuration. */
 168 struct ofp_switch_config {
 169     struct ofp_header header;
 170     uint16_t flags;             /* OFPC_* flags. */
 171     uint16_t miss_send_len;     /* Max bytes of new flow that datapath should
 172                                    send to the controller. */
 173 };
 174 OFP_ASSERT(sizeof(struct ofp_switch_config) == 12);
 175
 176 /* Capabilities supported by the datapath. */
 177 enum ofp_capabilities {
 178     OFPC_FLOW_STATS     = 1 << 0,  /* Flow statistics. */
 179     OFPC_TABLE_STATS    = 1 << 1,  /* Table statistics. */
 180     OFPC_PORT_STATS     = 1 << 2,  /* Port statistics. */
 181     OFPC_STP            = 1 << 3,  /* 802.1d spanning tree. */
 182     OFPC_RESERVED       = 1 << 4,  /* Reserved, must be zero. */
 183     OFPC_IP_REASM       = 1 << 5,  /* Can reassemble IP fragments. */
 184     OFPC_QUEUE_STATS    = 1 << 6,  /* Queue statistics. */
 185     OFPC_ARP_MATCH_IP   = 1 << 7   /* Match IP addresses in ARP pkts. */
 186 };
 187
 188 /* Flags to indicate behavior of the physical port.  These flags are
 189  * used in ofp_phy_port to describe the current configuration.  They are
 190  * used in the ofp_port_mod message to configure the port's behavior.
 191  */
 192 enum ofp_port_config {
 193     OFPPC_PORT_DOWN    = 1 << 0,  /* Port is administratively down. */
 194
 195     OFPPC_NO_STP       = 1 << 1,  /* Disable 802.1D spanning tree on port. */
 196     OFPPC_NO_RECV      = 1 << 2,  /* Drop all packets except 802.1D spanning
 197                                      tree packets. */
 198     OFPPC_NO_RECV_STP  = 1 << 3,  /* Drop received 802.1D STP packets. */
 199     OFPPC_NO_FLOOD     = 1 << 4,  /* Do not include this port when flooding. */
 200     OFPPC_NO_FWD       = 1 << 5,  /* Drop packets forwarded to port. */
 201     OFPPC_NO_PACKET_IN = 1 << 6   /* Do not send packet-in msgs for port. */
 202 };
 203
 204 /* Current state of the physical port.  These are not configurable from
 205  * the controller.
 206  */
 207 enum ofp_port_state {
 208     OFPPS_LINK_DOWN   = 1 << 0, /* No physical link present. */
 209
 210     /* The OFPPS_STP_* bits have no effect on switch operation.  The
 211      * controller must adjust OFPPC_NO_RECV, OFPPC_NO_FWD, and
 212      * OFPPC_NO_PACKET_IN appropriately to fully implement an 802.1D spanning
 213      * tree. */
 214     OFPPS_STP_LISTEN  = 0 << 8, /* Not learning or relaying frames. */
 215     OFPPS_STP_LEARN   = 1 << 8, /* Learning but not relaying frames. */
 216     OFPPS_STP_FORWARD = 2 << 8, /* Learning and relaying frames. */
 217     OFPPS_STP_BLOCK   = 3 << 8, /* Not part of spanning tree. */
 218     OFPPS_STP_MASK    = 3 << 8  /* Bit mask for OFPPS_STP_* values. */
 219 };
 220
 221 /* Features of physical ports available in a datapath. */
 222 enum ofp_port_features {
 223     OFPPF_10MB_HD    = 1 << 0,  /* 10 Mb half-duplex rate support. */
 224     OFPPF_10MB_FD    = 1 << 1,  /* 10 Mb full-duplex rate support. */
 225     OFPPF_100MB_HD   = 1 << 2,  /* 100 Mb half-duplex rate support. */
 226     OFPPF_100MB_FD   = 1 << 3,  /* 100 Mb full-duplex rate support. */
 227     OFPPF_1GB_HD     = 1 << 4,  /* 1 Gb half-duplex rate support. */
 228     OFPPF_1GB_FD     = 1 << 5,  /* 1 Gb full-duplex rate support. */
 229     OFPPF_10GB_FD    = 1 << 6,  /* 10 Gb full-duplex rate support. */
 230     OFPPF_COPPER     = 1 << 7,  /* Copper medium. */
 231     OFPPF_FIBER      = 1 << 8,  /* Fiber medium. */
 232     OFPPF_AUTONEG    = 1 << 9,  /* Auto-negotiation. */
 233     OFPPF_PAUSE      = 1 << 10, /* Pause. */
 234     OFPPF_PAUSE_ASYM = 1 << 11  /* Asymmetric pause. */
 235 };
 236
 237 /* Description of a physical port */
 238 struct ofp_phy_port {
 239     uint16_t port_no;
 240     uint8_t hw_addr[OFP_ETH_ALEN];
 241     char name[OFP_MAX_PORT_NAME_LEN]; /* Null-terminated */
 242
 243     uint32_t config;        /* Bitmap of OFPPC_* flags. */
 244     uint32_t state;         /* Bitmap of OFPPS_* flags. */
 245
 246     /* Bitmaps of OFPPF_* that describe features.  All bits zeroed if
 247      * unsupported or unavailable. */
 248     uint32_t curr;          /* Current features. */
 249     uint32_t advertised;    /* Features being advertised by the port. */
 250     uint32_t supported;     /* Features supported by the port. */
 251     uint32_t peer;          /* Features advertised by peer. */
 252 };
 253 OFP_ASSERT(sizeof(struct ofp_phy_port) == 48);
 254
 255 /* Switch features. */
 256 struct ofp_switch_features {
 257     struct ofp_header header;
 258     uint64_t datapath_id;   /* Datapath unique ID.  The lower 48-bits are for
 259                                a MAC address, while the upper 16-bits are
 260                                implementer-defined. */
 261
 262     uint32_t n_buffers;     /* Max packets buffered at once. */
 263
 264     uint8_t n_tables;       /* Number of tables supported by datapath. */
 265     uint8_t pad[3];         /* Align to 64-bits. */
 266
 267     /* Features. */
 268     uint32_t capabilities;  /* Bitmap of support "ofp_capabilities". */
 269     uint32_t actions;       /* Bitmap of supported "ofp_action_type"s. */
 270
 271     /* Port info.*/
 272     struct ofp_phy_port ports[0];  /* Port definitions.  The number of ports
 273                                       is inferred from the length field in
 274                                       the header. */
 275 };
 276 OFP_ASSERT(sizeof(struct ofp_switch_features) == 32);
 277
 278 /* What changed about the physical port */
 279 enum ofp_port_reason {
 280     OFPPR_ADD,              /* The port was added. */
 281     OFPPR_DELETE,           /* The port was removed. */
 282     OFPPR_MODIFY            /* Some attribute of the port has changed. */
 283 };
 284
 285 /* A physical port has changed in the datapath */
 286 struct ofp_port_status {
 287     struct ofp_header header;
 288     uint8_t reason;          /* One of OFPPR_*. */
 289     uint8_t pad[7];          /* Align to 64-bits. */
 290     struct ofp_phy_port desc;
 291 };
 292 OFP_ASSERT(sizeof(struct ofp_port_status) == 64);
 293
 294 /* Modify behavior of the physical port */
 295 struct ofp_port_mod {
 296     struct ofp_header header;
 297     uint16_t port_no;
 298     uint8_t hw_addr[OFP_ETH_ALEN]; /* The hardware address is not
 299                                       configurable.  This is used to
 300                                       sanity-check the request, so it must
 301                                       be the same as returned in an
 302                                       ofp_phy_port struct. */
 303
 304     uint32_t config;        /* Bitmap of OFPPC_* flags. */
 305     uint32_t mask;          /* Bitmap of OFPPC_* flags to be changed. */
 306
 307     uint32_t advertise;     /* Bitmap of "ofp_port_features"s.  Zero all
 308                                bits to prevent any action taking place. */
 309     uint8_t pad[4];         /* Pad to 64-bits. */
 310 };
 311 OFP_ASSERT(sizeof(struct ofp_port_mod) == 32);
 312
 313 /* Why is this packet being sent to the controller? */
 314 enum ofp_packet_in_reason {
 315     OFPR_NO_MATCH,          /* No matching flow. */
 316     OFPR_ACTION             /* Action explicitly output to controller. */
 317 };
 318
 319 /* Packet received on port (datapath -> controller). */
 320 struct ofp_packet_in {
 321     struct ofp_header header;
 322     uint32_t buffer_id;     /* ID assigned by datapath. */
 323     uint16_t total_len;     /* Full length of frame. */
 324     uint16_t in_port;       /* Port on which frame was received. */
 325     uint8_t reason;         /* Reason packet is being sent (one of OFPR_*) */
 326     uint8_t pad;
 327     uint8_t data[0];        /* Ethernet frame, halfway through 32-bit word,
 328                                so the IP header is 32-bit aligned.  The
 329                                amount of data is inferred from the length
 330                                field in the header.  Because of padding,
 331                                offsetof(struct ofp_packet_in, data) ==
 332                                sizeof(struct ofp_packet_in) - 2. */
 333 };
 334 OFP_ASSERT(sizeof(struct ofp_packet_in) == 20);
 335
 336 enum ofp_action_type {
 337     OFPAT_OUTPUT,           /* Output to switch port. */
 338     OFPAT_SET_VLAN_VID,     /* Set the 802.1q VLAN id. */
 339     OFPAT_SET_VLAN_PCP,     /* Set the 802.1q priority. */
 340     OFPAT_STRIP_VLAN,       /* Strip the 802.1q header. */
 341     OFPAT_SET_DL_SRC,       /* Ethernet source address. */
 342     OFPAT_SET_DL_DST,       /* Ethernet destination address. */
 343     OFPAT_SET_NW_SRC,       /* IP source address. */
 344     OFPAT_SET_NW_DST,       /* IP destination address. */
 345     OFPAT_SET_NW_TOS,       /* IP ToS (DSCP field, 6 bits). */
 346     OFPAT_SET_TP_SRC,       /* TCP/UDP source port. */
 347     OFPAT_SET_TP_DST,       /* TCP/UDP destination port. */
 348     OFPAT_ENQUEUE,          /* Output to queue.  */
 349     OFPAT_VENDOR = 0xffff
 350 };
 351
 352 /* Action structure for OFPAT_OUTPUT, which sends packets out 'port'.
 353  * When the 'port' is the OFPP_CONTROLLER, 'max_len' indicates the max
 354  * number of bytes to send.  A 'max_len' of zero means no bytes of the
 355  * packet should be sent.*/
 356 struct ofp_action_output {
 357     uint16_t type;                  /* OFPAT_OUTPUT. */
 358     uint16_t len;                   /* Length is 8. */
 359     uint16_t port;                  /* Output port. */
 360     uint16_t max_len;               /* Max length to send to controller. */
 361 };
 362 OFP_ASSERT(sizeof(struct ofp_action_output) == 8);
 363
 364 /* The VLAN id is 12 bits, so we can use the entire 16 bits to indicate
 365  * special conditions.  All ones is used to match that no VLAN id was
 366  * set. */
 367 #define OFP_VLAN_NONE      0xffff
 368
 369 /* Action structure for OFPAT_SET_VLAN_VID. */
 370 struct ofp_action_vlan_vid {
 371     uint16_t type;                  /* OFPAT_SET_VLAN_VID. */
 372     uint16_t len;                   /* Length is 8. */
 373     uint16_t vlan_vid;              /* VLAN id. */
 374     uint8_t pad[2];
 375 };
 376 OFP_ASSERT(sizeof(struct ofp_action_vlan_vid) == 8);
 377
 378 /* Action structure for OFPAT_SET_VLAN_PCP. */
 379 struct ofp_action_vlan_pcp {
 380     uint16_t type;                  /* OFPAT_SET_VLAN_PCP. */
 381     uint16_t len;                   /* Length is 8. */
 382     uint8_t vlan_pcp;               /* VLAN priority. */
 383     uint8_t pad[3];
 384 };
 385 OFP_ASSERT(sizeof(struct ofp_action_vlan_pcp) == 8);
 386
 387 /* Action structure for OFPAT_SET_DL_SRC/DST. */
 388 struct ofp_action_dl_addr {
 389     uint16_t type;                  /* OFPAT_SET_DL_SRC/DST. */
 390     uint16_t len;                   /* Length is 16. */
 391     uint8_t dl_addr[OFP_ETH_ALEN];  /* Ethernet address. */
 392     uint8_t pad[6];
 393 };
 394 OFP_ASSERT(sizeof(struct ofp_action_dl_addr) == 16);
 395
 396 /* Action structure for OFPAT_SET_NW_SRC/DST. */
 397 struct ofp_action_nw_addr {
 398     uint16_t type;                  /* OFPAT_SET_TW_SRC/DST. */
 399     uint16_t len;                   /* Length is 8. */
 400     uint32_t nw_addr;               /* IP address. */
 401 };
 402 OFP_ASSERT(sizeof(struct ofp_action_nw_addr) == 8);
 403
 404 /* Action structure for OFPAT_SET_TP_SRC/DST. */
 405 struct ofp_action_tp_port {
 406     uint16_t type;                  /* OFPAT_SET_TP_SRC/DST. */
 407     uint16_t len;                   /* Length is 8. */
 408     uint16_t tp_port;               /* TCP/UDP port. */
 409     uint8_t pad[2];
 410 };
 411 OFP_ASSERT(sizeof(struct ofp_action_tp_port) == 8);
 412
 413 /* Action structure for OFPAT_SET_NW_TOS. */
 414 struct ofp_action_nw_tos {
 415     uint16_t type;                  /* OFPAT_SET_TW_SRC/DST. */
 416     uint16_t len;                   /* Length is 8. */
 417     uint8_t nw_tos;                 /* IP ToS (DSCP field, 6 bits). */
 418     uint8_t pad[3];
 419 };
 420 OFP_ASSERT(sizeof(struct ofp_action_nw_tos) == 8);
 421
 422 /* Action header for OFPAT_VENDOR. The rest of the body is vendor-defined. */
 423 struct ofp_action_vendor_header {
 424     uint16_t type;                  /* OFPAT_VENDOR. */
 425     uint16_t len;                   /* Length is a multiple of 8. */
 426     uint32_t vendor;                /* Vendor ID, which takes the same form
 427                                        as in "struct ofp_vendor_header". */
 428 };
 429 OFP_ASSERT(sizeof(struct ofp_action_vendor_header) == 8);
 430
 431 /* Action header that is common to all actions.  The length includes the
 432  * header and any padding used to make the action 64-bit aligned.
 433  * NB: The length of an action *must* always be a multiple of eight. */
 434 struct ofp_action_header {
 435     uint16_t type;                  /* One of OFPAT_*. */
 436     uint16_t len;                   /* Length of action, including this
 437                                        header.  This is the length of action,
 438                                        including any padding to make it
 439                                        64-bit aligned. */
 440     uint8_t pad[4];
 441 };
 442 OFP_ASSERT(sizeof(struct ofp_action_header) == 8);
 443
 444 /* Send packet (controller -> datapath). */
 445 struct ofp_packet_out {
 446     struct ofp_header header;
 447     uint32_t buffer_id;           /* ID assigned by datapath (-1 if none). */
 448     uint16_t in_port;             /* Packet's input port (OFPP_NONE if none). */
 449     uint16_t actions_len;         /* Size of action array in bytes. */
 450     struct ofp_action_header actions[0]; /* Actions. */
 451     /* uint8_t data[0]; */        /* Packet data.  The length is inferred
 452                                      from the length field in the header.
 453                                      (Only meaningful if buffer_id == -1.) */
 454 };
 455 OFP_ASSERT(sizeof(struct ofp_packet_out) == 16);
 456
 457 enum ofp_flow_mod_command {
 458     OFPFC_ADD,              /* New flow. */
 459     OFPFC_MODIFY,           /* Modify all matching flows. */
 460     OFPFC_MODIFY_STRICT,    /* Modify entry strictly matching wildcards */
 461     OFPFC_DELETE,           /* Delete all matching flows. */
 462     OFPFC_DELETE_STRICT    /* Strictly match wildcards and priority. */
 463 };
 464
 465 /* Flow wildcards. */
 466 enum ofp_flow_wildcards {
 467     OFPFW_IN_PORT  = 1 << 0,  /* Switch input port. */
 468     OFPFW_DL_VLAN  = 1 << 1,  /* VLAN id. */
 469     OFPFW_DL_SRC   = 1 << 2,  /* Ethernet source address. */
 470     OFPFW_DL_DST   = 1 << 3,  /* Ethernet destination address. */
 471     OFPFW_DL_TYPE  = 1 << 4,  /* Ethernet frame type. */
 472     OFPFW_NW_PROTO = 1 << 5,  /* IP protocol. */
 473     OFPFW_TP_SRC   = 1 << 6,  /* TCP/UDP source port. */
 474     OFPFW_TP_DST   = 1 << 7,  /* TCP/UDP destination port. */
 475
 476     /* IP source address wildcard bit count.  0 is exact match, 1 ignores the
 477      * LSB, 2 ignores the 2 least-significant bits, ..., 32 and higher wildcard
 478      * the entire field.  This is the *opposite* of the usual convention where
 479      * e.g. /24 indicates that 8 bits (not 24 bits) are wildcarded. */
 480     OFPFW_NW_SRC_SHIFT = 8,
 481     OFPFW_NW_SRC_BITS = 6,
 482     OFPFW_NW_SRC_MASK = ((1 << OFPFW_NW_SRC_BITS) - 1) << OFPFW_NW_SRC_SHIFT,
 483     OFPFW_NW_SRC_ALL = 32 << OFPFW_NW_SRC_SHIFT,
 484
 485     /* IP destination address wildcard bit count.  Same format as source. */
 486     OFPFW_NW_DST_SHIFT = 14,
 487     OFPFW_NW_DST_BITS = 6,
 488     OFPFW_NW_DST_MASK = ((1 << OFPFW_NW_DST_BITS) - 1) << OFPFW_NW_DST_SHIFT,
 489     OFPFW_NW_DST_ALL = 32 << OFPFW_NW_DST_SHIFT,
 490
 491     OFPFW_DL_VLAN_PCP = 1 << 20,  /* VLAN priority. */
 492     OFPFW_NW_TOS = 1 << 21,  /* IP ToS (DSCP field, 6 bits). */
 493
 494     /* Wildcard all fields. */
 495     OFPFW_ALL = ((1 << 22) - 1)
 496 };
 497
 498 /* The wildcards for ICMP type and code fields use the transport source
 499  * and destination port fields, respectively. */
 500 #define OFPFW_ICMP_TYPE OFPFW_TP_SRC
 501 #define OFPFW_ICMP_CODE OFPFW_TP_DST
 502
 503 /* Values below this cutoff are 802.3 packets and the two bytes
 504  * following MAC addresses are used as a frame length.  Otherwise, the
 505  * two bytes are used as the Ethernet type.
 506  */
 507 #define OFP_DL_TYPE_ETH2_CUTOFF   0x0600
 508
 509 /* Value of dl_type to indicate that the frame does not include an
 510  * Ethernet type.
 511  */
 512 #define OFP_DL_TYPE_NOT_ETH_TYPE  0x05ff
 513
 514 /* The VLAN id is 12-bits, so we can use the entire 16 bits to indicate
 515  * special conditions.  All ones indicates that no VLAN id was set.
 516  */
 517 #define OFP_VLAN_NONE      0xffff
 518
 519 /* Fields to match against flows */
 520 struct ofp_match {
 521     uint32_t wildcards;        /* Wildcard fields. */
 522     uint16_t in_port;          /* Input switch port. */
 523     uint8_t dl_src[OFP_ETH_ALEN]; /* Ethernet source address. */
 524     uint8_t dl_dst[OFP_ETH_ALEN]; /* Ethernet destination address. */
 525     uint16_t dl_vlan;          /* Input VLAN id. */
 526     uint8_t dl_vlan_pcp;       /* Input VLAN priority. */
 527     uint8_t pad1[1];           /* Align to 64-bits */
 528     uint16_t dl_type;          /* Ethernet frame type. */
 529     uint8_t nw_tos;            /* IP ToS (actually DSCP field, 6 bits). */
 530     uint8_t nw_proto;          /* IP protocol or lower 8 bits of
 531                                 * ARP opcode. */
 532     uint8_t pad2[2];           /* Align to 64-bits */
 533     uint32_t nw_src;           /* IP source address. */
 534     uint32_t nw_dst;           /* IP destination address. */
 535     uint16_t tp_src;           /* TCP/UDP source port. */
 536     uint16_t tp_dst;           /* TCP/UDP destination port. */
 537 };
 538 OFP_ASSERT(sizeof(struct ofp_match) == 40);
 539
 540 /* The match fields for ICMP type and code use the transport source and
 541  * destination port fields, respectively. */
 542 #define icmp_type tp_src
 543 #define icmp_code tp_dst
 544
 545 /* Value used in "idle_timeout" and "hard_timeout" to indicate that the entry
 546  * is permanent. */
 547 #define OFP_FLOW_PERMANENT 0
 548
 549 /* By default, choose a priority in the middle. */
 550 #define OFP_DEFAULT_PRIORITY 0x8000
 551
 552 enum ofp_flow_mod_flags {
 553     OFPFF_SEND_FLOW_REM = 1 << 0,  /* Send flow removed message when flow
 554                                     * expires or is deleted. */
 555     OFPFF_CHECK_OVERLAP = 1 << 1,  /* Check for overlapping entries first. */
 556     OFPFF_EMERG         = 1 << 2   /* Remark this is for emergency. */
 557 };
 558
 559 /* Flow setup and teardown (controller -> datapath). */
 560 struct ofp_flow_mod {
 561     struct ofp_header header;
 562     struct ofp_match match;      /* Fields to match */
 563     uint64_t cookie;             /* Opaque controller-issued identifier. */
 564
 565     /* Flow actions. */
 566     uint16_t command;             /* One of OFPFC_*. */
 567     uint16_t idle_timeout;        /* Idle time before discarding (seconds). */
 568     uint16_t hard_timeout;        /* Max time before discarding (seconds). */
 569     uint16_t priority;            /* Priority level of flow entry. */
 570     uint32_t buffer_id;           /* Buffered packet to apply to (or -1).
 571                                      Not meaningful for OFPFC_DELETE*. */
 572     uint16_t out_port;            /* For OFPFC_DELETE* commands, require
 573                                      matching entries to include this as an
 574                                      output port.  A value of OFPP_NONE
 575                                      indicates no restriction. */
 576     uint16_t flags;               /* One of OFPFF_*. */
 577     struct ofp_action_header actions[0]; /* The action length is inferred
 578                                             from the length field in the
 579                                             header. */
 580 };
 581 OFP_ASSERT(sizeof(struct ofp_flow_mod) == 72);
 582
 583 /* Why was this flow removed? */
 584 enum ofp_flow_removed_reason {
 585     OFPRR_IDLE_TIMEOUT,         /* Flow idle time exceeded idle_timeout. */
 586     OFPRR_HARD_TIMEOUT,         /* Time exceeded hard_timeout. */
 587     OFPRR_DELETE                /* Evicted by a DELETE flow mod. */
 588 };
 589
 590 /* Flow removed (datapath -> controller). */
 591 struct ofp_flow_removed {
 592     struct ofp_header header;
 593     struct ofp_match match;   /* Description of fields. */
 594     uint64_t cookie;          /* Opaque controller-issued identifier. */
 595
 596     uint16_t priority;        /* Priority level of flow entry. */
 597     uint8_t reason;           /* One of OFPRR_*. */
 598     uint8_t pad[1];           /* Align to 32-bits. */
 599
 600     uint32_t duration_sec;    /* Time flow was alive in seconds. */
 601     uint32_t duration_nsec;   /* Time flow was alive in nanoseconds beyond
 602                                  duration_sec. */
 603     uint16_t idle_timeout;    /* Idle timeout from original flow mod. */
 604     uint8_t pad2[2];          /* Align to 64-bits. */
 605     uint64_t packet_count;
 606     uint64_t byte_count;
 607 };
 608 OFP_ASSERT(sizeof(struct ofp_flow_removed) == 88);
 609
 610 /* Values for 'type' in ofp_error_message.  These values are immutable: they
 611  * will not change in future versions of the protocol (although new values may
 612  * be added). */
 613 enum ofp_error_type {
 614     OFPET_HELLO_FAILED,         /* Hello protocol failed. */
 615     OFPET_BAD_REQUEST,          /* Request was not understood. */
 616     OFPET_BAD_ACTION,           /* Error in action description. */
 617     OFPET_FLOW_MOD_FAILED,      /* Problem modifying flow entry. */
 618     OFPET_PORT_MOD_FAILED,      /* Port mod request failed. */
 619     OFPET_QUEUE_OP_FAILED       /* Queue operation failed. */
 620 };
 621
 622 /* ofp_error_msg 'code' values for OFPET_HELLO_FAILED.  'data' contains an
 623  * ASCII text string that may give failure details. */
 624 enum ofp_hello_failed_code {
 625     OFPHFC_INCOMPATIBLE,        /* No compatible version. */
 626     OFPHFC_EPERM                /* Permissions error. */
 627 };
 628
 629 /* ofp_error_msg 'code' values for OFPET_BAD_REQUEST.  'data' contains at least
 630  * the first 64 bytes of the failed request. */
 631 enum ofp_bad_request_code {
 632     OFPBRC_BAD_VERSION,         /* ofp_header.version not supported. */
 633     OFPBRC_BAD_TYPE,            /* ofp_header.type not supported. */
 634     OFPBRC_BAD_STAT,            /* ofp_stats_request.type not supported. */
 635     OFPBRC_BAD_VENDOR,          /* Vendor not supported (in ofp_vendor_header
 636                                  * or ofp_stats_request or ofp_stats_reply). */
 637     OFPBRC_BAD_SUBTYPE,         /* Vendor subtype not supported. */
 638     OFPBRC_EPERM,               /* Permissions error. */
 639     OFPBRC_BAD_LEN,             /* Wrong request length for type. */
 640     OFPBRC_BUFFER_EMPTY,        /* Specified buffer has already been used. */
 641     OFPBRC_BUFFER_UNKNOWN       /* Specified buffer does not exist. */
 642 };
 643
 644 /* ofp_error_msg 'code' values for OFPET_BAD_ACTION.  'data' contains at least
 645  * the first 64 bytes of the failed request. */
 646 enum ofp_bad_action_code {
 647     OFPBAC_BAD_TYPE,           /* Unknown action type. */
 648     OFPBAC_BAD_LEN,            /* Length problem in actions. */
 649     OFPBAC_BAD_VENDOR,         /* Unknown vendor id specified. */
 650     OFPBAC_BAD_VENDOR_TYPE,    /* Unknown action type for vendor id. */
 651     OFPBAC_BAD_OUT_PORT,       /* Problem validating output action. */
 652     OFPBAC_BAD_ARGUMENT,       /* Bad action argument. */
 653     OFPBAC_EPERM,              /* Permissions error. */
 654     OFPBAC_TOO_MANY,           /* Can't handle this many actions. */
 655     OFPBAC_BAD_QUEUE           /* Problem validating output queue. */
 656 };
 657
 658 /* ofp_error_msg 'code' values for OFPET_FLOW_MOD_FAILED.  'data' contains
 659  * at least the first 64 bytes of the failed request. */
 660 enum ofp_flow_mod_failed_code {
 661     OFPFMFC_ALL_TABLES_FULL,    /* Flow not added because of full tables. */
 662     OFPFMFC_OVERLAP,            /* Attempted to add overlapping flow with
 663                                  * CHECK_OVERLAP flag set. */
 664     OFPFMFC_EPERM,              /* Permissions error. */
 665     OFPFMFC_BAD_EMERG_TIMEOUT,  /* Flow not added because of non-zero idle/hard
 666                                  * timeout. */
 667     OFPFMFC_BAD_COMMAND,        /* Unknown command. */
 668     OFPFMFC_UNSUPPORTED         /* Unsupported action list - cannot process in
 669                                  * the order specified. */
 670 };
 671
 672 /* ofp_error_msg 'code' values for OFPET_PORT_MOD_FAILED.  'data' contains
 673  * at least the first 64 bytes of the failed request. */
 674 enum ofp_port_mod_failed_code {
 675     OFPPMFC_BAD_PORT,            /* Specified port does not exist. */
 676     OFPPMFC_BAD_HW_ADDR,         /* Specified hardware address is wrong. */
 677 };
 678
 679 /* ofp_error msg 'code' values for OFPET_QUEUE_OP_FAILED. 'data' contains
 680  * at least the first 64 bytes of the failed request */
 681 enum ofp_queue_op_failed_code {
 682     OFPQOFC_BAD_PORT,           /* Invalid port (or port does not exist). */
 683     OFPQOFC_BAD_QUEUE,          /* Queue does not exist. */
 684     OFPQOFC_EPERM               /* Permissions error. */
 685 };
 686
 687 /* OFPT_ERROR: Error message (datapath -> controller). */
 688 struct ofp_error_msg {
 689     struct ofp_header header;
 690
 691     uint16_t type;
 692     uint16_t code;
 693     uint8_t data[0];          /* Variable-length data.  Interpreted based
 694                                  on the type and code. */
 695 };
 696 OFP_ASSERT(sizeof(struct ofp_error_msg) == 12);
 697
 698 enum ofp_stats_types {
 699     /* Description of this OpenFlow switch.
 700      * The request body is empty.
 701      * The reply body is struct ofp_desc_stats. */
 702     OFPST_DESC,
 703
 704     /* Individual flow statistics.
 705      * The request body is struct ofp_flow_stats_request.
 706      * The reply body is an array of struct ofp_flow_stats. */
 707     OFPST_FLOW,
 708
 709     /* Aggregate flow statistics.
 710      * The request body is struct ofp_aggregate_stats_request.
 711      * The reply body is struct ofp_aggregate_stats_reply. */
 712     OFPST_AGGREGATE,
 713
 714     /* Flow table statistics.
 715      * The request body is empty.
 716      * The reply body is an array of struct ofp_table_stats. */
 717     OFPST_TABLE,
 718
 719     /* Physical port statistics.
 720      * The request body is struct ofp_port_stats_request.
 721      * The reply body is an array of struct ofp_port_stats. */
 722     OFPST_PORT,
 723
 724     /* Queue statistics for a port
 725      * The request body defines the port
 726      * The reply body is an array of struct ofp_queue_stats */
 727     OFPST_QUEUE,
 728
 729     /* Vendor extension.
 730      * The request and reply bodies begin with a 32-bit vendor ID, which takes
 731      * the same form as in "struct ofp_vendor_header".  The request and reply
 732      * bodies are otherwise vendor-defined. */
 733     OFPST_VENDOR = 0xffff
 734 };
 735
 736 struct ofp_stats_request {
 737     struct ofp_header header;
 738     uint16_t type;              /* One of the OFPST_* constants. */
 739     uint16_t flags;             /* OFPSF_REQ_* flags (none yet defined). */
 740     uint8_t body[0];            /* Body of the request. */
 741 };
 742 OFP_ASSERT(sizeof(struct ofp_stats_request) == 12);
 743
 744 enum ofp_stats_reply_flags {
 745     OFPSF_REPLY_MORE  = 1 << 0  /* More replies to follow. */
 746 };
 747
 748 struct ofp_stats_reply {
 749     struct ofp_header header;
 750     uint16_t type;              /* One of the OFPST_* constants. */
 751     uint16_t flags;             /* OFPSF_REPLY_* flags. */
 752     uint8_t body[0];            /* Body of the reply. */
 753 };
 754 OFP_ASSERT(sizeof(struct ofp_stats_reply) == 12);
 755
 756 #define DESC_STR_LEN   256
 757 #define SERIAL_NUM_LEN 32
 758 /* Body of reply to OFPST_DESC request.  Each entry is a NULL-terminated
 759  * ASCII string. */
 760 struct ofp_desc_stats {
 761     char mfr_desc[DESC_STR_LEN];       /* Manufacturer description. */
 762     char hw_desc[DESC_STR_LEN];        /* Hardware description. */
 763     char sw_desc[DESC_STR_LEN];        /* Software description. */
 764     char serial_num[SERIAL_NUM_LEN];   /* Serial number. */
 765     char dp_desc[DESC_STR_LEN];        /* Human readable description of datapath. */
 766 };
 767 OFP_ASSERT(sizeof(struct ofp_desc_stats) == 1056);
 768
 769 /* Body for ofp_stats_request of type OFPST_FLOW. */
 770 struct ofp_flow_stats_request {
 771     struct ofp_match match;   /* Fields to match. */
 772     uint8_t table_id;         /* ID of table to read (from ofp_table_stats),
 773                                  0xff for all tables or 0xfe for emergency. */
 774     uint8_t pad;              /* Align to 32 bits. */
 775     uint16_t out_port;        /* Require matching entries to include this
 776                                  as an output port.  A value of OFPP_NONE
 777                                  indicates no restriction. */
 778 };
 779 OFP_ASSERT(sizeof(struct ofp_flow_stats_request) == 44);
 780
 781 /* Body of reply to OFPST_FLOW request. */
 782 struct ofp_flow_stats {
 783     uint16_t length;          /* Length of this entry. */
 784     uint8_t table_id;         /* ID of table flow came from. */
 785     uint8_t pad;
 786     struct ofp_match match;   /* Description of fields. */
 787     uint32_t duration_sec;    /* Time flow has been alive in seconds. */
 788     uint32_t duration_nsec;   /* Time flow has been alive in nanoseconds beyond
 789                                  duration_sec. */
 790     uint16_t priority;        /* Priority of the entry. Only meaningful
 791                                  when this is not an exact-match entry. */
 792     uint16_t idle_timeout;    /* Number of seconds idle before expiration. */
 793     uint16_t hard_timeout;    /* Number of seconds before expiration. */
 794     uint8_t pad2[6];          /* Align to 64-bits. */
 795     uint64_t cookie;          /* Opaque controller-issued identifier. */
 796     uint64_t packet_count;    /* Number of packets in flow. */
 797     uint64_t byte_count;      /* Number of bytes in flow. */
 798     struct ofp_action_header actions[0]; /* Actions. */
 799 };
 800 OFP_ASSERT(sizeof(struct ofp_flow_stats) == 88);
 801
 802 /* Body for ofp_stats_request of type OFPST_AGGREGATE. */
 803 struct ofp_aggregate_stats_request {
 804     struct ofp_match match;   /* Fields to match. */
 805     uint8_t table_id;         /* ID of table to read (from ofp_table_stats)
 806                                  0xff for all tables or 0xfe for emergency. */
 807     uint8_t pad;              /* Align to 32 bits. */
 808     uint16_t out_port;        /* Require matching entries to include this
 809                                  as an output port.  A value of OFPP_NONE
 810                                  indicates no restriction. */
 811 };
 812 OFP_ASSERT(sizeof(struct ofp_aggregate_stats_request) == 44);
 813
 814 /* Body of reply to OFPST_AGGREGATE request. */
 815 struct ofp_aggregate_stats_reply {
 816     uint64_t packet_count;    /* Number of packets in flows. */
 817     uint64_t byte_count;      /* Number of bytes in flows. */
 818     uint32_t flow_count;      /* Number of flows. */
 819     uint8_t pad[4];           /* Align to 64 bits. */
 820 };
 821 OFP_ASSERT(sizeof(struct ofp_aggregate_stats_reply) == 24);
 822
 823 /* Body of reply to OFPST_TABLE request. */
 824 struct ofp_table_stats {
 825     uint8_t table_id;        /* Identifier of table.  Lower numbered tables
 826                                 are consulted first. */
 827     uint8_t pad[3];          /* Align to 32-bits. */
 828     char name[OFP_MAX_TABLE_NAME_LEN];
 829     uint32_t wildcards;      /* Bitmap of OFPFW_* wildcards that are
 830                                 supported by the table. */
 831     uint32_t max_entries;    /* Max number of entries supported. */
 832     uint32_t active_count;   /* Number of active entries. */
 833     uint64_t lookup_count;   /* Number of packets looked up in table. */
 834     uint64_t matched_count;  /* Number of packets that hit table. */
 835 };
 836 OFP_ASSERT(sizeof(struct ofp_table_stats) == 64);
 837
 838 /* Body for ofp_stats_request of type OFPST_PORT. */
 839 struct ofp_port_stats_request {
 840     uint16_t port_no;        /* OFPST_PORT message must request statistics
 841                               * either for a single port (specified in
 842                               * port_no) or for all ports (if port_no ==
 843                               * OFPP_NONE). */
 844     uint8_t pad[6];
 845 };
 846 OFP_ASSERT(sizeof(struct ofp_port_stats_request) == 8);
 847
 848 /* Body of reply to OFPST_PORT request. If a counter is unsupported, set
 849  * the field to all ones. */
 850 struct ofp_port_stats {
 851     uint16_t port_no;
 852     uint8_t pad[6];          /* Align to 64-bits. */
 853     uint64_t rx_packets;     /* Number of received packets. */
 854     uint64_t tx_packets;     /* Number of transmitted packets. */
 855     uint64_t rx_bytes;       /* Number of received bytes. */
 856     uint64_t tx_bytes;       /* Number of transmitted bytes. */
 857     uint64_t rx_dropped;     /* Number of packets dropped by RX. */
 858     uint64_t tx_dropped;     /* Number of packets dropped by TX. */
 859     uint64_t rx_errors;      /* Number of receive errors.  This is a super-set
 860                                 of more specific receive errors and should be
 861                                 greater than or equal to the sum of all
 862                                 rx_*_err values. */
 863     uint64_t tx_errors;      /* Number of transmit errors.  This is a super-set
 864                                 of more specific transmit errors and should be
 865                                 greater than or equal to the sum of all
 866                                 tx_*_err values (none currently defined.) */
 867     uint64_t rx_frame_err;   /* Number of frame alignment errors. */
 868     uint64_t rx_over_err;    /* Number of packets with RX overrun. */
 869     uint64_t rx_crc_err;     /* Number of CRC errors. */
 870     uint64_t collisions;     /* Number of collisions. */
 871 };
 872 OFP_ASSERT(sizeof(struct ofp_port_stats) == 104);
 873
 874 /* Vendor extension. */
 875 struct ofp_vendor_header {
 876     struct ofp_header header;   /* Type OFPT_VENDOR. */
 877     uint32_t vendor;            /* Vendor ID:
 878                                  * - MSB 0: low-order bytes are IEEE OUI.
 879                                  * - MSB != 0: defined by OpenFlow
 880                                  *   consortium. */
 881     /* Vendor-defined arbitrary additional data. */
 882 };
 883 OFP_ASSERT(sizeof(struct ofp_vendor_header) == 12);
 884
 885 /* All ones is used to indicate all queues in a port (for stats retrieval). */
 886 #define OFPQ_ALL      0xffffffff
 887
 888 /* Min rate > 1000 means not configured. */
 889 #define OFPQ_MIN_RATE_UNCFG      0xffff
 890
 891 enum ofp_queue_properties {
 892     OFPQT_NONE = 0,       /* No property defined for queue (default). */
 893     OFPQT_MIN_RATE,       /* Minimum datarate guaranteed. */
 894                           /* Other types should be added here
 895                            * (i.e. max rate, precedence, etc). */
 896 };
 897
 898 /* Common description for a queue. */
 899 struct ofp_queue_prop_header {
 900     uint16_t property;    /* One of OFPQT_. */
 901     uint16_t len;         /* Length of property, including this header. */
 902     uint8_t pad[4];       /* 64-bit alignemnt. */
 903 };
 904 OFP_ASSERT(sizeof(struct ofp_queue_prop_header) == 8);
 905
 906 /* Min-Rate queue property description. */
 907 struct ofp_queue_prop_min_rate {
 908     struct ofp_queue_prop_header prop_header; /* prop: OFPQT_MIN, len: 16. */
 909     uint16_t rate;        /* In 1/10 of a percent; >1000 -> disabled. */
 910     uint8_t pad[6];       /* 64-bit alignment */
 911 };
 912 OFP_ASSERT(sizeof(struct ofp_queue_prop_min_rate) == 16);
 913
 914 /* Full description for a queue. */
 915 struct ofp_packet_queue {
 916     uint32_t queue_id;     /* id for the specific queue. */
 917     uint16_t len;          /* Length in bytes of this queue desc. */
 918     uint8_t pad[2];        /* 64-bit alignment. */
 919     struct ofp_queue_prop_header properties[0]; /* List of properties. */
 920 };
 921 OFP_ASSERT(sizeof(struct ofp_packet_queue) == 8);
 922
 923 /* Query for port queue configuration. */
 924 struct ofp_queue_get_config_request {
 925     struct ofp_header header;
 926     uint16_t port;         /* Port to be queried. Should refer
 927                               to a valid physical port (i.e. < OFPP_MAX) */
 928     uint8_t pad[2];        /* 32-bit alignment. */
 929 };
 930 OFP_ASSERT(sizeof(struct ofp_queue_get_config_request) == 12);
 931
 932 /* Queue configuration for a given port. */
 933 struct ofp_queue_get_config_reply {
 934     struct ofp_header header;
 935     uint16_t port;
 936     uint8_t pad[6];
 937     struct ofp_packet_queue queues[0]; /* List of configured queues. */
 938 };
 939 OFP_ASSERT(sizeof(struct ofp_queue_get_config_reply) == 16);
 940
 941 /* OFPAT_ENQUEUE action struct: send packets to given queue on port. */
 942 struct ofp_action_enqueue {
 943     uint16_t type;            /* OFPAT_ENQUEUE. */
 944     uint16_t len;             /* Len is 16. */
 945     uint16_t port;            /* Port that queue belongs. Should
 946                                  refer to a valid physical port
 947                                  (i.e. < OFPP_MAX) or OFPP_IN_PORT. */
 948     uint8_t pad[6];           /* Pad for 64-bit alignment. */
 949     uint32_t queue_id;        /* Where to enqueue the packets. */
 950 };
 951 OFP_ASSERT(sizeof(struct ofp_action_enqueue) == 16);
 952
 953 struct ofp_queue_stats_request {
 954     uint16_t port_no;        /* All ports if OFPT_ALL. */
 955     uint8_t pad[2];          /* Align to 32-bits. */
 956     uint32_t queue_id;       /* All queues if OFPQ_ALL. */
 957 };
 958 OFP_ASSERT(sizeof(struct ofp_queue_stats_request) == 8);
 959
 960 struct ofp_queue_stats {
 961     uint16_t port_no;
 962     uint8_t pad[2];          /* Align to 32-bits. */
 963     uint32_t queue_id;       /* Queue i.d */
 964     uint64_t tx_bytes;       /* Number of transmitted bytes. */
 965     uint64_t tx_packets;     /* Number of transmitted packets. */
 966     uint64_t tx_errors;      /* Number of packets dropped due to overrun. */
 967 };
 968 OFP_ASSERT(sizeof(struct ofp_queue_stats) == 32);
 969
 970 #endif /* openflow/openflow.h */