lib/ofp-actions.h

   1 /*
   2  * Copyright (c) 2012, 2013 Nicira, Inc.
   3  *
   4  * Licensed under the Apache License, Version 2.0 (the "License");
   5  * you may not use this file except in compliance with the License.
   6  * You may obtain a copy of the License at:
   7  *
   8  *     http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  * Unless required by applicable law or agreed to in writing, software
  11  * distributed under the License is distributed on an "AS IS" BASIS,
  12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  * See the License for the specific language governing permissions and
  14  * limitations under the License.
  15  */
  16
  17 #ifndef OFP_ACTIONS_H
  18 #define OFP_ACTIONS_H 1
  19
  20 #include <stdint.h>
  21 #include "meta-flow.h"
  22 #include "ofp-errors.h"
  23 #include "ofp-util.h"
  24 #include "openflow/openflow.h"
  25 #include "openflow/nicira-ext.h"
  26 #include "openvswitch/types.h"
  27
  28 /* List of OVS abstracted actions.
  29  *
  30  * This macro is used directly only internally by this header, but the list is
  31  * still of interest to developers.
  32  *
  33  * Each DEFINE_OFPACT invocation has the following parameters:
  34  *
  35  * 1. <ENUM>, used below in the enum definition of OFPACT_<ENUM>, and
  36  *    elsewhere.
  37  *
  38  * 2. <STRUCT> corresponding to a structure "struct <STRUCT>", that must be
  39  *    defined below.  This structure must be an abstract definition of the
  40  *    action.  Its first member must have type "struct ofpact" and name
  41  *    "ofpact".  It may be fixed length or end with a flexible array member
  42  *    (e.g. "int member[];").
  43  *
  44  * 3. <MEMBER>, which has one of two possible values:
  45  *
  46  *        - If "struct <STRUCT>" is fixed-length, it must be "ofpact".
  47  *
  48  *        - If "struct <STRUCT>" is variable-length, it must be the name of the
  49  *          flexible array member.
  50  */
  51 #define OFPACTS                                                     \
  52     /* Output. */                                                   \
  53     DEFINE_OFPACT(OUTPUT,          ofpact_output,        ofpact)    \
  54     DEFINE_OFPACT(CONTROLLER,      ofpact_controller,    ofpact)    \
  55     DEFINE_OFPACT(ENQUEUE,         ofpact_enqueue,       ofpact)    \
  56     DEFINE_OFPACT(OUTPUT_REG,      ofpact_output_reg,    ofpact)    \
  57     DEFINE_OFPACT(BUNDLE,          ofpact_bundle,        slaves)    \
  58                                                                     \
  59     /* Header changes. */                                           \
  60     DEFINE_OFPACT(SET_VLAN_VID,    ofpact_vlan_vid,      ofpact)    \
  61     DEFINE_OFPACT(SET_VLAN_PCP,    ofpact_vlan_pcp,      ofpact)    \
  62     DEFINE_OFPACT(STRIP_VLAN,      ofpact_null,          ofpact)    \
  63     DEFINE_OFPACT(PUSH_VLAN,       ofpact_null,          ofpact)    \
  64     DEFINE_OFPACT(SET_ETH_SRC,     ofpact_mac,           ofpact)    \
  65     DEFINE_OFPACT(SET_ETH_DST,     ofpact_mac,           ofpact)    \
  66     DEFINE_OFPACT(SET_IPV4_SRC,    ofpact_ipv4,          ofpact)    \
  67     DEFINE_OFPACT(SET_IPV4_DST,    ofpact_ipv4,          ofpact)    \
  68     DEFINE_OFPACT(SET_IPV4_DSCP,   ofpact_dscp,          ofpact)    \
  69     DEFINE_OFPACT(SET_L4_SRC_PORT, ofpact_l4_port,       ofpact)    \
  70     DEFINE_OFPACT(SET_L4_DST_PORT, ofpact_l4_port,       ofpact)    \
  71     DEFINE_OFPACT(REG_MOVE,        ofpact_reg_move,      ofpact)    \
  72     DEFINE_OFPACT(REG_LOAD,        ofpact_reg_load,      ofpact)    \
  73     DEFINE_OFPACT(STACK_PUSH,      ofpact_stack,         ofpact)    \
  74     DEFINE_OFPACT(STACK_POP,       ofpact_stack,         ofpact)    \
  75     DEFINE_OFPACT(DEC_TTL,         ofpact_cnt_ids,       cnt_ids)   \
  76     DEFINE_OFPACT(SET_MPLS_TTL,    ofpact_mpls_ttl,      ofpact)    \
  77     DEFINE_OFPACT(DEC_MPLS_TTL,    ofpact_null,          ofpact)    \
  78     DEFINE_OFPACT(PUSH_MPLS,       ofpact_push_mpls,     ofpact)    \
  79     DEFINE_OFPACT(POP_MPLS,        ofpact_pop_mpls,      ofpact)    \
  80                                                                     \
  81     /* Metadata. */                                                 \
  82     DEFINE_OFPACT(SET_TUNNEL,      ofpact_tunnel,        ofpact)    \
  83     DEFINE_OFPACT(SET_QUEUE,       ofpact_queue,         ofpact)    \
  84     DEFINE_OFPACT(POP_QUEUE,       ofpact_null,          ofpact)    \
  85     DEFINE_OFPACT(FIN_TIMEOUT,     ofpact_fin_timeout,   ofpact)    \
  86                                                                     \
  87     /* Flow table interaction. */                                   \
  88     DEFINE_OFPACT(RESUBMIT,        ofpact_resubmit,      ofpact)    \
  89     DEFINE_OFPACT(LEARN,           ofpact_learn,         specs)     \
  90                                                                     \
  91     /* Arithmetic. */                                               \
  92     DEFINE_OFPACT(MULTIPATH,       ofpact_multipath,     ofpact)    \
  93                                                                     \
  94     /* Other. */                                                    \
  95     DEFINE_OFPACT(NOTE,            ofpact_note,          data)      \
  96     DEFINE_OFPACT(EXIT,            ofpact_null,          ofpact)    \
  97                                                                     \
  98     /* Instructions */                                              \
  99     /* XXX Write-Actions */                                         \
 100     DEFINE_OFPACT(WRITE_METADATA,  ofpact_metadata,      ofpact)    \
 101     DEFINE_OFPACT(CLEAR_ACTIONS,   ofpact_null,          ofpact)    \
 102     DEFINE_OFPACT(GOTO_TABLE,      ofpact_goto_table,    ofpact)
 103
 104 /* enum ofpact_type, with a member OFPACT_<ENUM> for each action. */
 105 enum OVS_PACKED_ENUM ofpact_type {
 106 #define DEFINE_OFPACT(ENUM, STRUCT, MEMBER) OFPACT_##ENUM,
 107     OFPACTS
 108 #undef DEFINE_OFPACT
 109 };
 110
 111 /* N_OFPACTS, the number of values of "enum ofpact_type". */
 112 enum {
 113     N_OFPACTS =
 114 #define DEFINE_OFPACT(ENUM, STRUCT, MEMBER) + 1
 115     OFPACTS
 116 #undef DEFINE_OFPACT
 117 };
 118
 119 /* Header for an action.
 120  *
 121  * Each action is a structure "struct ofpact_*" that begins with "struct
 122  * ofpact", usually followed by other data that describes the action.  Actions
 123  * are padded out to a multiple of OFPACT_ALIGNTO bytes in length.
 124  *
 125  * The 'compat' member is special:
 126  *
 127  *     - Most "struct ofpact"s correspond to one particular kind of OpenFlow
 128  *       action, at least in a given OpenFlow version.  For example,
 129  *       OFPACT_SET_VLAN_VID corresponds to OFPAT10_SET_VLAN_VID in OpenFlow
 130  *       1.0.
 131  *
 132  *       For such actions, the 'compat' member is not meaningful and generally
 133  *       should be zero.
 134  *
 135  *     - A few "struct ofpact"s correspond to multiple OpenFlow actions.  For
 136  *       example, OFPACT_SET_TUNNEL can be NXAST_SET_TUNNEL or
 137  *       NXAST_SET_TUNNEL64.  In these cases, if the "struct ofpact" originated
 138  *       from OpenFlow, then we want to make sure that, if it gets translated
 139  *       back to OpenFlow later, it is translated back to the same action type.
 140  *       (Otherwise, we'd violate the promise made in DESIGN, in the "Action
 141  *       Reproduction" section.)
 142  *
 143  *       For such actions, the 'compat' member should be the original action
 144  *       type.  (If the action didn't originate from OpenFlow, then setting
 145  *       'compat' to zero should be fine: code to translate the ofpact to
 146  *       OpenFlow must tolerate this case.)
 147  */
 148 struct ofpact {
 149     enum ofpact_type type;      /* OFPACT_*. */
 150     enum ofputil_action_code compat; /* Original type when added, if any. */
 151     uint16_t len;               /* Length of the action, in bytes, including
 152                                  * struct ofpact, excluding padding. */
 153 };
 154
 155 #ifdef __GNUC__
 156 /* Make sure that OVS_PACKED_ENUM really worked. */
 157 BUILD_ASSERT_DECL(sizeof(struct ofpact) == 4);
 158 #endif
 159
 160 /* Alignment. */
 161 #define OFPACT_ALIGNTO 8
 162 #define OFPACT_ALIGN(SIZE) ROUND_UP(SIZE, OFPACT_ALIGNTO)
 163
 164 static inline struct ofpact *
 165 ofpact_next(const struct ofpact *ofpact)
 166 {
 167     return (void *) ((uint8_t *) ofpact + OFPACT_ALIGN(ofpact->len));
 168 }
 169
 170 static inline struct ofpact *
 171 ofpact_end(const struct ofpact *ofpacts, size_t ofpacts_len)
 172 {
 173     return (void *) ((uint8_t *) ofpacts + ofpacts_len);
 174 }
 175
 176 /* Assigns POS to each ofpact, in turn, in the OFPACTS_LEN bytes of ofpacts
 177  * starting at OFPACTS. */
 178 #define OFPACT_FOR_EACH(POS, OFPACTS, OFPACTS_LEN)                      \
 179     for ((POS) = (OFPACTS); (POS) < ofpact_end(OFPACTS, OFPACTS_LEN);  \
 180          (POS) = ofpact_next(POS))
 181 \f
 182 /* Action structure for each OFPACT_*. */
 183
 184 /* OFPACT_STRIP_VLAN, OFPACT_POP_QUEUE, OFPACT_EXIT, OFPACT_CLEAR_ACTIONS.
 185  *
 186  * Used for OFPAT10_STRIP_VLAN, NXAST_POP_QUEUE, NXAST_EXIT,
 187  * OFPAT11_POP_VLAN, OFPIT11_CLEAR_ACTIONS.
 188  *
 189  * Action structure for actions that do not have any extra data beyond the
 190  * action type. */
 191 struct ofpact_null {
 192     struct ofpact ofpact;
 193 };
 194
 195 /* OFPACT_OUTPUT.
 196  *
 197  * Used for OFPAT10_OUTPUT. */
 198 struct ofpact_output {
 199     struct ofpact ofpact;
 200     uint16_t port;              /* Output port. */
 201     uint16_t max_len;           /* Max send len, for port OFPP_CONTROLLER. */
 202 };
 203
 204 /* OFPACT_CONTROLLER.
 205  *
 206  * Used for NXAST_CONTROLLER. */
 207 struct ofpact_controller {
 208     struct ofpact ofpact;
 209     uint16_t max_len;           /* Maximum length to send to controller. */
 210     uint16_t controller_id;     /* Controller ID to send packet-in. */
 211     enum ofp_packet_in_reason reason; /* Reason to put in packet-in. */
 212 };
 213
 214 /* OFPACT_ENQUEUE.
 215  *
 216  * Used for OFPAT10_ENQUEUE. */
 217 struct ofpact_enqueue {
 218     struct ofpact ofpact;
 219     uint16_t port;
 220     uint32_t queue;
 221 };
 222
 223 /* OFPACT_OUTPUT_REG.
 224  *
 225  * Used for NXAST_OUTPUT_REG. */
 226 struct ofpact_output_reg {
 227     struct ofpact ofpact;
 228     struct mf_subfield src;
 229     uint16_t max_len;
 230 };
 231
 232 /* OFPACT_BUNDLE.
 233  *
 234  * Used for NXAST_BUNDLE. */
 235 struct ofpact_bundle {
 236     struct ofpact ofpact;
 237
 238     /* Slave choice algorithm to apply to hash value. */
 239     enum nx_bd_algorithm algorithm;
 240
 241     /* What fields to hash and how. */
 242     enum nx_hash_fields fields;
 243     uint16_t basis;             /* Universal hash parameter. */
 244
 245     struct mf_subfield dst;
 246
 247     /* Slaves for output. */
 248     unsigned int n_slaves;
 249     uint16_t slaves[];
 250 };
 251
 252 /* OFPACT_SET_VLAN_VID.
 253  *
 254  * Used for OFPAT10_SET_VLAN_VID. */
 255 struct ofpact_vlan_vid {
 256     struct ofpact ofpact;
 257     uint16_t vlan_vid;          /* VLAN VID in low 12 bits, 0 in other bits. */
 258 };
 259
 260 /* OFPACT_SET_VLAN_PCP.
 261  *
 262  * Used for OFPAT10_SET_VLAN_PCP. */
 263 struct ofpact_vlan_pcp {
 264     struct ofpact ofpact;
 265     uint8_t vlan_pcp;           /* VLAN PCP in low 3 bits, 0 in other bits. */
 266 };
 267
 268 /* OFPACT_SET_ETH_SRC, OFPACT_SET_ETH_DST.
 269  *
 270  * Used for OFPAT10_SET_DL_SRC, OFPAT10_SET_DL_DST. */
 271 struct ofpact_mac {
 272     struct ofpact ofpact;
 273     uint8_t mac[ETH_ADDR_LEN];
 274 };
 275
 276 /* OFPACT_SET_IPV4_SRC, OFPACT_SET_IPV4_DST.
 277  *
 278  * Used for OFPAT10_SET_NW_SRC, OFPAT10_SET_NW_DST. */
 279 struct ofpact_ipv4 {
 280     struct ofpact ofpact;
 281     ovs_be32 ipv4;
 282 };
 283
 284 /* OFPACT_SET_IPV4_DSCP.
 285  *
 286  * Used for OFPAT10_SET_NW_TOS. */
 287 struct ofpact_dscp {
 288     struct ofpact ofpact;
 289     uint8_t dscp;               /* DSCP in high 6 bits, rest ignored. */
 290 };
 291
 292 /* OFPACT_SET_L4_SRC_PORT, OFPACT_SET_L4_DST_PORT.
 293  *
 294  * Used for OFPAT10_SET_TP_SRC, OFPAT10_SET_TP_DST. */
 295 struct ofpact_l4_port {
 296     struct ofpact ofpact;
 297     uint16_t port;              /* TCP or UDP port number. */
 298 };
 299
 300 /* OFPACT_REG_MOVE.
 301  *
 302  * Used for NXAST_REG_MOVE. */
 303 struct ofpact_reg_move {
 304     struct ofpact ofpact;
 305     struct mf_subfield src;
 306     struct mf_subfield dst;
 307 };
 308
 309 /* OFPACT_STACK_PUSH.
 310  *
 311  * Used for NXAST_STACK_PUSH and NXAST_STACK_POP. */
 312 struct ofpact_stack {
 313     struct ofpact ofpact;
 314     struct mf_subfield subfield;
 315 };
 316
 317 /* OFPACT_REG_LOAD.
 318  *
 319  * Used for NXAST_REG_LOAD, OFPAT12_SET_FIELD. */
 320 struct ofpact_reg_load {
 321     struct ofpact ofpact;
 322     struct mf_subfield dst;
 323     union mf_subvalue subvalue; /* Least-significant bits are used. */
 324 };
 325
 326 /* OFPACT_PUSH_VLAN/MPLS/PBB
 327  *
 328  * Used for NXAST_PUSH_MPLS, OFPAT11_PUSH_MPLS. */
 329 struct ofpact_push_mpls {
 330     struct ofpact ofpact;
 331     ovs_be16 ethertype;
 332 };
 333
 334 /* OFPACT_POP_MPLS
 335  *
 336  * Used for NXAST_POP_MPLS, OFPAT11_POP_MPLS.. */
 337 struct ofpact_pop_mpls {
 338     struct ofpact ofpact;
 339     ovs_be16 ethertype;
 340 };
 341
 342 /* OFPACT_SET_TUNNEL.
 343  *
 344  * Used for NXAST_SET_TUNNEL, NXAST_SET_TUNNEL64. */
 345 struct ofpact_tunnel {
 346     struct ofpact ofpact;
 347     uint64_t tun_id;
 348 };
 349
 350 /* OFPACT_SET_QUEUE.
 351  *
 352  * Used for NXAST_SET_QUEUE. */
 353 struct ofpact_queue {
 354     struct ofpact ofpact;
 355     uint32_t queue_id;
 356 };
 357
 358 /* OFPACT_FIN_TIMEOUT.
 359  *
 360  * Used for NXAST_FIN_TIMEOUT. */
 361 struct ofpact_fin_timeout {
 362     struct ofpact ofpact;
 363     uint16_t fin_idle_timeout;
 364     uint16_t fin_hard_timeout;
 365 };
 366
 367 /* OFPACT_WRITE_METADATA.
 368  *
 369  * Used for NXAST_WRITE_METADATA. */
 370 struct ofpact_metadata {
 371     struct ofpact ofpact;
 372     ovs_be64 metadata;
 373     ovs_be64 mask;
 374 };
 375
 376 /* OFPACT_RESUBMIT.
 377  *
 378  * Used for NXAST_RESUBMIT, NXAST_RESUBMIT_TABLE. */
 379 struct ofpact_resubmit {
 380     struct ofpact ofpact;
 381     uint16_t in_port;
 382     uint8_t table_id;
 383 };
 384
 385 /* Part of struct ofpact_learn, below. */
 386 struct ofpact_learn_spec {
 387     int n_bits;
 388
 389     int src_type;
 390     struct mf_subfield src;
 391     union mf_subvalue src_imm;
 392
 393     int dst_type;
 394     struct mf_subfield dst;
 395 };
 396
 397 /* OFPACT_LEARN.
 398  *
 399  * Used for NXAST_LEARN. */
 400 struct ofpact_learn {
 401     struct ofpact ofpact;
 402
 403     uint16_t idle_timeout;      /* Idle time before discarding (seconds). */
 404     uint16_t hard_timeout;      /* Max time before discarding (seconds). */
 405     uint16_t priority;          /* Priority level of flow entry. */
 406     uint64_t cookie;            /* Cookie for new flow. */
 407     uint16_t flags;             /* Either 0 or OFPFF_SEND_FLOW_REM. */
 408     uint8_t table_id;           /* Table to insert flow entry. */
 409     uint16_t fin_idle_timeout;  /* Idle timeout after FIN, if nonzero. */
 410     uint16_t fin_hard_timeout;  /* Hard timeout after FIN, if nonzero. */
 411
 412     unsigned int n_specs;
 413     struct ofpact_learn_spec specs[];
 414 };
 415
 416 /* OFPACT_MULTIPATH.
 417  *
 418  * Used for NXAST_MULTIPATH. */
 419 struct ofpact_multipath {
 420     struct ofpact ofpact;
 421
 422     /* What fields to hash and how. */
 423     enum nx_hash_fields fields;
 424     uint16_t basis;             /* Universal hash parameter. */
 425
 426     /* Multipath link choice algorithm to apply to hash value. */
 427     enum nx_mp_algorithm algorithm;
 428     uint16_t max_link;          /* Number of output links, minus 1. */
 429     uint32_t arg;               /* Algorithm-specific argument. */
 430
 431     /* Where to store the result. */
 432     struct mf_subfield dst;
 433 };
 434
 435 /* OFPACT_NOTE.
 436  *
 437  * Used for NXAST_NOTE. */
 438 struct ofpact_note {
 439     struct ofpact ofpact;
 440     size_t length;
 441     uint8_t data[];
 442 };
 443
 444 /* OFPACT_DEC_TTL.
 445  *
 446  * Used for OFPAT11_DEC_NW_TTL, NXAST_DEC_TTL and NXAST_DEC_TTL_CNT_IDS. */
 447 struct ofpact_cnt_ids {
 448     struct ofpact ofpact;
 449
 450     /* Controller ids. */
 451     unsigned int n_controllers;
 452     uint16_t cnt_ids[];
 453 };
 454
 455 /* OFPACT_SET_MPLS_TTL.
 456  *
 457  * Used for NXAST_SET_MPLS_TTL */
 458 struct ofpact_mpls_ttl {
 459     struct ofpact ofpact;
 460
 461     uint8_t ttl;
 462 };
 463
 464 /* OFPACT_GOTO_TABLE
 465  *
 466  * Used for OFPIT11_GOTO_TABLE */
 467 struct ofpact_goto_table {
 468     struct ofpact ofpact;
 469     uint8_t table_id;
 470 };
 471
 472 /* Converting OpenFlow to ofpacts. */
 473 enum ofperr ofpacts_pull_openflow10(struct ofpbuf *openflow,
 474                                     unsigned int actions_len,
 475                                     struct ofpbuf *ofpacts);
 476 enum ofperr ofpacts_pull_openflow11_actions(struct ofpbuf *openflow,
 477                                             unsigned int actions_len,
 478                                             struct ofpbuf *ofpacts);
 479 enum ofperr ofpacts_pull_openflow11_instructions(struct ofpbuf *openflow,
 480                                                  unsigned int instructions_len,
 481                                                  struct ofpbuf *ofpacts);
 482 enum ofperr ofpacts_check(const struct ofpact[], size_t ofpacts_len,
 483                           const struct flow *, int max_ports);
 484 enum ofperr ofpacts_verify(const struct ofpact ofpacts[], size_t ofpacts_len);
 485
 486 /* Converting ofpacts to OpenFlow. */
 487 void ofpacts_put_openflow10(const struct ofpact[], size_t ofpacts_len,
 488                             struct ofpbuf *openflow);
 489 size_t ofpacts_put_openflow11_actions(const struct ofpact[], size_t ofpacts_len,
 490                                       struct ofpbuf *openflow);
 491 void ofpacts_put_openflow11_instructions(const struct ofpact[],
 492                                          size_t ofpacts_len,
 493                                          struct ofpbuf *openflow);
 494
 495 /* Working with ofpacts. */
 496 bool ofpacts_output_to_port(const struct ofpact[], size_t ofpacts_len,
 497                             uint16_t port);
 498 bool ofpacts_equal(const struct ofpact a[], size_t a_len,
 499                    const struct ofpact b[], size_t b_len);
 500
 501 /* Formatting ofpacts.
 502  *
 503  * (For parsing ofpacts, see ofp-parse.h.) */
 504 void ofpacts_format(const struct ofpact[], size_t ofpacts_len, struct ds *);
 505
 506 /* Internal use by the helpers below. */
 507 void ofpact_init(struct ofpact *, enum ofpact_type, size_t len);
 508 void *ofpact_put(struct ofpbuf *, enum ofpact_type, size_t len);
 509
 510 /* For each OFPACT_<ENUM> with a corresponding struct <STRUCT>, this defines
 511  * the following commonly useful functions:
 512  *
 513  *   struct <STRUCT> *ofpact_put_<ENUM>(struct ofpbuf *ofpacts);
 514  *
 515  *     Appends a new 'ofpact', of length OFPACT_<ENUM>_RAW_SIZE, to 'ofpacts',
 516  *     initializes it with ofpact_init_<ENUM>(), and returns it.  Also sets
 517  *     'ofpacts->l2' to the returned action.
 518  *
 519  *     After using this function to add a variable-length action, add the
 520  *     elements of the flexible array (e.g. with ofpbuf_put()), then use
 521  *     ofpact_update_len() to update the length embedded into the action.
 522  *     (Keep in mind the need to refresh the structure from 'ofpacts->l2' after
 523  *     adding data to 'ofpacts'.)
 524  *
 525  *   struct <STRUCT> *ofpact_get_<ENUM>(const struct ofpact *ofpact);
 526  *
 527  *     Returns 'ofpact' cast to "struct <STRUCT> *".  'ofpact->type' must be
 528  *     OFPACT_<ENUM>.
 529  *
 530  * as well as the following more rarely useful definitions:
 531  *
 532  *   void ofpact_init_<ENUM>(struct <STRUCT> *ofpact);
 533  *
 534  *     Initializes the parts of 'ofpact' that identify it as having type
 535  *     OFPACT_<ENUM> and length OFPACT_<ENUM>_RAW_SIZE and zeros the rest.
 536  *
 537  *   <ENUM>_RAW_SIZE
 538  *
 539  *     The size of the action structure.  For a fixed-length action, this is
 540  *     sizeof(struct <STRUCT>).  For a variable-length action, this is the
 541  *     offset to the variable-length part.
 542  *
 543  *   <ENUM>_SIZE
 544  *
 545  *     An integer constant, the value of OFPACT_<ENUM>_RAW_SIZE rounded up to a
 546  *     multiple of OFPACT_ALIGNTO.
 547  */
 548 #define DEFINE_OFPACT(ENUM, STRUCT, MEMBER)                             \
 549     BUILD_ASSERT_DECL(offsetof(struct STRUCT, ofpact) == 0);            \
 550                                                                         \
 551     enum { OFPACT_##ENUM##_RAW_SIZE                                     \
 552            = (offsetof(struct STRUCT, MEMBER)                           \
 553               ? offsetof(struct STRUCT, MEMBER)                         \
 554               : sizeof(struct STRUCT)) };                               \
 555                                                                         \
 556     enum { OFPACT_##ENUM##_SIZE                                         \
 557            = ROUND_UP(OFPACT_##ENUM##_RAW_SIZE, OFPACT_ALIGNTO) };      \
 558                                                                         \
 559     static inline struct STRUCT *                                       \
 560     ofpact_get_##ENUM(const struct ofpact *ofpact)                      \
 561     {                                                                   \
 562         ovs_assert(ofpact->type == OFPACT_##ENUM);                      \
 563         return (struct STRUCT *) ofpact;                                \
 564     }                                                                   \
 565                                                                         \
 566     static inline struct STRUCT *                                       \
 567     ofpact_put_##ENUM(struct ofpbuf *ofpacts)                           \
 568     {                                                                   \
 569         return ofpact_put(ofpacts, OFPACT_##ENUM,                       \
 570                           OFPACT_##ENUM##_RAW_SIZE);                    \
 571     }                                                                   \
 572                                                                         \
 573     static inline void                                                  \
 574     ofpact_init_##ENUM(struct STRUCT *ofpact)                           \
 575     {                                                                   \
 576         ofpact_init(&ofpact->ofpact, OFPACT_##ENUM,                     \
 577                     OFPACT_##ENUM##_RAW_SIZE);                          \
 578     }
 579 OFPACTS
 580 #undef DEFINE_OFPACT
 581
 582 /* Functions to use after adding ofpacts to a buffer. */
 583 void ofpact_update_len(struct ofpbuf *, struct ofpact *);
 584 void ofpact_pad(struct ofpbuf *);
 585
 586 /* OpenFlow 1.1 instructions.
 587  * The order is sorted in execution order. Not in the value of OFPIT11_xxx.
 588  * It is enforced on parser from text string.
 589  */
 590 #define OVS_INSTRUCTIONS                                    \
 591     DEFINE_INST(OFPIT11_APPLY_ACTIONS,                      \
 592                 ofp11_instruction_actions,        true,     \
 593                 "apply_actions")                            \
 594                                                             \
 595     DEFINE_INST(OFPIT11_CLEAR_ACTIONS,                      \
 596                 ofp11_instruction,                false,    \
 597                 "clear_actions")                            \
 598                                                             \
 599     DEFINE_INST(OFPIT11_WRITE_ACTIONS,                      \
 600                 ofp11_instruction_actions,        true,     \
 601                 "write_actions")                            \
 602                                                             \
 603     DEFINE_INST(OFPIT11_WRITE_METADATA,                     \
 604                 ofp11_instruction_write_metadata, false,    \
 605                 "write_metadata")                           \
 606                                                             \
 607     DEFINE_INST(OFPIT11_GOTO_TABLE,                         \
 608                 ofp11_instruction_goto_table,     false,    \
 609                 "goto_table")
 610
 611 enum ovs_instruction_type {
 612 #define DEFINE_INST(ENUM, STRUCT, EXTENSIBLE, NAME) OVSINST_##ENUM,
 613     OVS_INSTRUCTIONS
 614 #undef DEFINE_INST
 615 };
 616
 617 enum {
 618 #define DEFINE_INST(ENUM, STRUCT, EXTENSIBLE, NAME) + 1
 619     N_OVS_INSTRUCTIONS = OVS_INSTRUCTIONS
 620 #undef DEFINE_INST
 621 };
 622
 623
 624 static inline bool
 625 ofpact_is_instruction(const struct ofpact *a)
 626 {
 627     /* XXX Write-Actions */
 628     return a->type == OFPACT_CLEAR_ACTIONS
 629         || a->type == OFPACT_WRITE_METADATA
 630         || a->type == OFPACT_GOTO_TABLE;
 631 }
 632
 633 const char *ofpact_instruction_name_from_type(enum ovs_instruction_type type);
 634 int ofpact_instruction_type_from_name(const char *name);
 635
 636 void ofpact_set_field_init(struct ofpact_reg_load *load,
 637                            const struct mf_field *mf, const void *src);
 638
 639 #endif /* ofp-actions.h */