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     DEFINE_OFPACT(SAMPLE,          ofpact_sample,        ofpact)    \
  98                                                                     \
  99     /* Instructions */                                              \
 100     /* XXX Write-Actions */                                         \
 101     DEFINE_OFPACT(WRITE_METADATA,  ofpact_metadata,      ofpact)    \
 102     DEFINE_OFPACT(CLEAR_ACTIONS,   ofpact_null,          ofpact)    \
 103     DEFINE_OFPACT(GOTO_TABLE,      ofpact_goto_table,    ofpact)
 104
 105 /* enum ofpact_type, with a member OFPACT_<ENUM> for each action. */
 106 enum OVS_PACKED_ENUM ofpact_type {
 107 #define DEFINE_OFPACT(ENUM, STRUCT, MEMBER) OFPACT_##ENUM,
 108     OFPACTS
 109 #undef DEFINE_OFPACT
 110 };
 111
 112 /* N_OFPACTS, the number of values of "enum ofpact_type". */
 113 enum {
 114     N_OFPACTS =
 115 #define DEFINE_OFPACT(ENUM, STRUCT, MEMBER) + 1
 116     OFPACTS
 117 #undef DEFINE_OFPACT
 118 };
 119
 120 /* Header for an action.
 121  *
 122  * Each action is a structure "struct ofpact_*" that begins with "struct
 123  * ofpact", usually followed by other data that describes the action.  Actions
 124  * are padded out to a multiple of OFPACT_ALIGNTO bytes in length.
 125  *
 126  * The 'compat' member is special:
 127  *
 128  *     - Most "struct ofpact"s correspond to one particular kind of OpenFlow
 129  *       action, at least in a given OpenFlow version.  For example,
 130  *       OFPACT_SET_VLAN_VID corresponds to OFPAT10_SET_VLAN_VID in OpenFlow
 131  *       1.0.
 132  *
 133  *       For such actions, the 'compat' member is not meaningful and generally
 134  *       should be zero.
 135  *
 136  *     - A few "struct ofpact"s correspond to multiple OpenFlow actions.  For
 137  *       example, OFPACT_SET_TUNNEL can be NXAST_SET_TUNNEL or
 138  *       NXAST_SET_TUNNEL64.  In these cases, if the "struct ofpact" originated
 139  *       from OpenFlow, then we want to make sure that, if it gets translated
 140  *       back to OpenFlow later, it is translated back to the same action type.
 141  *       (Otherwise, we'd violate the promise made in DESIGN, in the "Action
 142  *       Reproduction" section.)
 143  *
 144  *       For such actions, the 'compat' member should be the original action
 145  *       type.  (If the action didn't originate from OpenFlow, then setting
 146  *       'compat' to zero should be fine: code to translate the ofpact to
 147  *       OpenFlow must tolerate this case.)
 148  */
 149 struct ofpact {
 150     enum ofpact_type type;      /* OFPACT_*. */
 151     enum ofputil_action_code compat; /* Original type when added, if any. */
 152     uint16_t len;               /* Length of the action, in bytes, including
 153                                  * struct ofpact, excluding padding. */
 154 };
 155
 156 #ifdef __GNUC__
 157 /* Make sure that OVS_PACKED_ENUM really worked. */
 158 BUILD_ASSERT_DECL(sizeof(struct ofpact) == 4);
 159 #endif
 160
 161 /* Alignment. */
 162 #define OFPACT_ALIGNTO 8
 163 #define OFPACT_ALIGN(SIZE) ROUND_UP(SIZE, OFPACT_ALIGNTO)
 164
 165 static inline struct ofpact *
 166 ofpact_next(const struct ofpact *ofpact)
 167 {
 168     return (void *) ((uint8_t *) ofpact + OFPACT_ALIGN(ofpact->len));
 169 }
 170
 171 static inline struct ofpact *
 172 ofpact_end(const struct ofpact *ofpacts, size_t ofpacts_len)
 173 {
 174     return (void *) ((uint8_t *) ofpacts + ofpacts_len);
 175 }
 176
 177 /* Assigns POS to each ofpact, in turn, in the OFPACTS_LEN bytes of ofpacts
 178  * starting at OFPACTS. */
 179 #define OFPACT_FOR_EACH(POS, OFPACTS, OFPACTS_LEN)                      \
 180     for ((POS) = (OFPACTS); (POS) < ofpact_end(OFPACTS, OFPACTS_LEN);  \
 181          (POS) = ofpact_next(POS))
 182 \f
 183 /* Action structure for each OFPACT_*. */
 184
 185 /* OFPACT_STRIP_VLAN, OFPACT_POP_QUEUE, OFPACT_EXIT, OFPACT_CLEAR_ACTIONS.
 186  *
 187  * Used for OFPAT10_STRIP_VLAN, NXAST_POP_QUEUE, NXAST_EXIT,
 188  * OFPAT11_POP_VLAN, OFPIT11_CLEAR_ACTIONS.
 189  *
 190  * Action structure for actions that do not have any extra data beyond the
 191  * action type. */
 192 struct ofpact_null {
 193     struct ofpact ofpact;
 194 };
 195
 196 /* OFPACT_OUTPUT.
 197  *
 198  * Used for OFPAT10_OUTPUT. */
 199 struct ofpact_output {
 200     struct ofpact ofpact;
 201     uint16_t port;              /* Output port. */
 202     uint16_t max_len;           /* Max send len, for port OFPP_CONTROLLER. */
 203 };
 204
 205 /* OFPACT_CONTROLLER.
 206  *
 207  * Used for NXAST_CONTROLLER. */
 208 struct ofpact_controller {
 209     struct ofpact ofpact;
 210     uint16_t max_len;           /* Maximum length to send to controller. */
 211     uint16_t controller_id;     /* Controller ID to send packet-in. */
 212     enum ofp_packet_in_reason reason; /* Reason to put in packet-in. */
 213 };
 214
 215 /* OFPACT_ENQUEUE.
 216  *
 217  * Used for OFPAT10_ENQUEUE. */
 218 struct ofpact_enqueue {
 219     struct ofpact ofpact;
 220     uint16_t port;
 221     uint32_t queue;
 222 };
 223
 224 /* OFPACT_OUTPUT_REG.
 225  *
 226  * Used for NXAST_OUTPUT_REG. */
 227 struct ofpact_output_reg {
 228     struct ofpact ofpact;
 229     struct mf_subfield src;
 230     uint16_t max_len;
 231 };
 232
 233 /* OFPACT_BUNDLE.
 234  *
 235  * Used for NXAST_BUNDLE. */
 236 struct ofpact_bundle {
 237     struct ofpact ofpact;
 238
 239     /* Slave choice algorithm to apply to hash value. */
 240     enum nx_bd_algorithm algorithm;
 241
 242     /* What fields to hash and how. */
 243     enum nx_hash_fields fields;
 244     uint16_t basis;             /* Universal hash parameter. */
 245
 246     struct mf_subfield dst;
 247
 248     /* Slaves for output. */
 249     unsigned int n_slaves;
 250     uint16_t slaves[];
 251 };
 252
 253 /* OFPACT_SET_VLAN_VID.
 254  *
 255  * Used for OFPAT10_SET_VLAN_VID. */
 256 struct ofpact_vlan_vid {
 257     struct ofpact ofpact;
 258     uint16_t vlan_vid;          /* VLAN VID in low 12 bits, 0 in other bits. */
 259 };
 260
 261 /* OFPACT_SET_VLAN_PCP.
 262  *
 263  * Used for OFPAT10_SET_VLAN_PCP. */
 264 struct ofpact_vlan_pcp {
 265     struct ofpact ofpact;
 266     uint8_t vlan_pcp;           /* VLAN PCP in low 3 bits, 0 in other bits. */
 267 };
 268
 269 /* OFPACT_SET_ETH_SRC, OFPACT_SET_ETH_DST.
 270  *
 271  * Used for OFPAT10_SET_DL_SRC, OFPAT10_SET_DL_DST. */
 272 struct ofpact_mac {
 273     struct ofpact ofpact;
 274     uint8_t mac[ETH_ADDR_LEN];
 275 };
 276
 277 /* OFPACT_SET_IPV4_SRC, OFPACT_SET_IPV4_DST.
 278  *
 279  * Used for OFPAT10_SET_NW_SRC, OFPAT10_SET_NW_DST. */
 280 struct ofpact_ipv4 {
 281     struct ofpact ofpact;
 282     ovs_be32 ipv4;
 283 };
 284
 285 /* OFPACT_SET_IPV4_DSCP.
 286  *
 287  * Used for OFPAT10_SET_NW_TOS. */
 288 struct ofpact_dscp {
 289     struct ofpact ofpact;
 290     uint8_t dscp;               /* DSCP in high 6 bits, rest ignored. */
 291 };
 292
 293 /* OFPACT_SET_L4_SRC_PORT, OFPACT_SET_L4_DST_PORT.
 294  *
 295  * Used for OFPAT10_SET_TP_SRC, OFPAT10_SET_TP_DST. */
 296 struct ofpact_l4_port {
 297     struct ofpact ofpact;
 298     uint16_t port;              /* TCP or UDP port number. */
 299 };
 300
 301 /* OFPACT_REG_MOVE.
 302  *
 303  * Used for NXAST_REG_MOVE. */
 304 struct ofpact_reg_move {
 305     struct ofpact ofpact;
 306     struct mf_subfield src;
 307     struct mf_subfield dst;
 308 };
 309
 310 /* OFPACT_STACK_PUSH.
 311  *
 312  * Used for NXAST_STACK_PUSH and NXAST_STACK_POP. */
 313 struct ofpact_stack {
 314     struct ofpact ofpact;
 315     struct mf_subfield subfield;
 316 };
 317
 318 /* OFPACT_REG_LOAD.
 319  *
 320  * Used for NXAST_REG_LOAD, OFPAT12_SET_FIELD. */
 321 struct ofpact_reg_load {
 322     struct ofpact ofpact;
 323     struct mf_subfield dst;
 324     union mf_subvalue subvalue; /* Least-significant bits are used. */
 325 };
 326
 327 /* OFPACT_PUSH_VLAN/MPLS/PBB
 328  *
 329  * Used for NXAST_PUSH_MPLS, OFPAT11_PUSH_MPLS. */
 330 struct ofpact_push_mpls {
 331     struct ofpact ofpact;
 332     ovs_be16 ethertype;
 333 };
 334
 335 /* OFPACT_POP_MPLS
 336  *
 337  * Used for NXAST_POP_MPLS, OFPAT11_POP_MPLS.. */
 338 struct ofpact_pop_mpls {
 339     struct ofpact ofpact;
 340     ovs_be16 ethertype;
 341 };
 342
 343 /* OFPACT_SET_TUNNEL.
 344  *
 345  * Used for NXAST_SET_TUNNEL, NXAST_SET_TUNNEL64. */
 346 struct ofpact_tunnel {
 347     struct ofpact ofpact;
 348     uint64_t tun_id;
 349 };
 350
 351 /* OFPACT_SET_QUEUE.
 352  *
 353  * Used for NXAST_SET_QUEUE. */
 354 struct ofpact_queue {
 355     struct ofpact ofpact;
 356     uint32_t queue_id;
 357 };
 358
 359 /* OFPACT_FIN_TIMEOUT.
 360  *
 361  * Used for NXAST_FIN_TIMEOUT. */
 362 struct ofpact_fin_timeout {
 363     struct ofpact ofpact;
 364     uint16_t fin_idle_timeout;
 365     uint16_t fin_hard_timeout;
 366 };
 367
 368 /* OFPACT_WRITE_METADATA.
 369  *
 370  * Used for NXAST_WRITE_METADATA. */
 371 struct ofpact_metadata {
 372     struct ofpact ofpact;
 373     ovs_be64 metadata;
 374     ovs_be64 mask;
 375 };
 376
 377 /* OFPACT_RESUBMIT.
 378  *
 379  * Used for NXAST_RESUBMIT, NXAST_RESUBMIT_TABLE. */
 380 struct ofpact_resubmit {
 381     struct ofpact ofpact;
 382     uint16_t in_port;
 383     uint8_t table_id;
 384 };
 385
 386 /* Part of struct ofpact_learn, below. */
 387 struct ofpact_learn_spec {
 388     int n_bits;
 389
 390     int src_type;
 391     struct mf_subfield src;
 392     union mf_subvalue src_imm;
 393
 394     int dst_type;
 395     struct mf_subfield dst;
 396 };
 397
 398 /* OFPACT_LEARN.
 399  *
 400  * Used for NXAST_LEARN. */
 401 struct ofpact_learn {
 402     struct ofpact ofpact;
 403
 404     uint16_t idle_timeout;      /* Idle time before discarding (seconds). */
 405     uint16_t hard_timeout;      /* Max time before discarding (seconds). */
 406     uint16_t priority;          /* Priority level of flow entry. */
 407     uint64_t cookie;            /* Cookie for new flow. */
 408     uint16_t flags;             /* Either 0 or OFPFF_SEND_FLOW_REM. */
 409     uint8_t table_id;           /* Table to insert flow entry. */
 410     uint16_t fin_idle_timeout;  /* Idle timeout after FIN, if nonzero. */
 411     uint16_t fin_hard_timeout;  /* Hard timeout after FIN, if nonzero. */
 412
 413     unsigned int n_specs;
 414     struct ofpact_learn_spec specs[];
 415 };
 416
 417 /* OFPACT_MULTIPATH.
 418  *
 419  * Used for NXAST_MULTIPATH. */
 420 struct ofpact_multipath {
 421     struct ofpact ofpact;
 422
 423     /* What fields to hash and how. */
 424     enum nx_hash_fields fields;
 425     uint16_t basis;             /* Universal hash parameter. */
 426
 427     /* Multipath link choice algorithm to apply to hash value. */
 428     enum nx_mp_algorithm algorithm;
 429     uint16_t max_link;          /* Number of output links, minus 1. */
 430     uint32_t arg;               /* Algorithm-specific argument. */
 431
 432     /* Where to store the result. */
 433     struct mf_subfield dst;
 434 };
 435
 436 /* OFPACT_NOTE.
 437  *
 438  * Used for NXAST_NOTE. */
 439 struct ofpact_note {
 440     struct ofpact ofpact;
 441     size_t length;
 442     uint8_t data[];
 443 };
 444
 445 /* OFPACT_SAMPLE.
 446  *
 447  * Used for NXAST_SAMPLE. */
 448 struct ofpact_sample {
 449     struct ofpact ofpact;
 450     uint16_t probability;  // Always >0.
 451     uint32_t collector_set_id;
 452     uint32_t obs_domain_id;
 453     uint32_t obs_point_id;
 454 };
 455
 456 /* OFPACT_DEC_TTL.
 457  *
 458  * Used for OFPAT11_DEC_NW_TTL, NXAST_DEC_TTL and NXAST_DEC_TTL_CNT_IDS. */
 459 struct ofpact_cnt_ids {
 460     struct ofpact ofpact;
 461
 462     /* Controller ids. */
 463     unsigned int n_controllers;
 464     uint16_t cnt_ids[];
 465 };
 466
 467 /* OFPACT_SET_MPLS_TTL.
 468  *
 469  * Used for NXAST_SET_MPLS_TTL */
 470 struct ofpact_mpls_ttl {
 471     struct ofpact ofpact;
 472
 473     uint8_t ttl;
 474 };
 475
 476 /* OFPACT_GOTO_TABLE
 477  *
 478  * Used for OFPIT11_GOTO_TABLE */
 479 struct ofpact_goto_table {
 480     struct ofpact ofpact;
 481     uint8_t table_id;
 482 };
 483
 484 /* Converting OpenFlow to ofpacts. */
 485 enum ofperr ofpacts_pull_openflow10(struct ofpbuf *openflow,
 486                                     unsigned int actions_len,
 487                                     struct ofpbuf *ofpacts);
 488 enum ofperr ofpacts_pull_openflow11_actions(struct ofpbuf *openflow,
 489                                             unsigned int actions_len,
 490                                             struct ofpbuf *ofpacts);
 491 enum ofperr ofpacts_pull_openflow11_instructions(struct ofpbuf *openflow,
 492                                                  unsigned int instructions_len,
 493                                                  struct ofpbuf *ofpacts);
 494 enum ofperr ofpacts_check(const struct ofpact[], size_t ofpacts_len,
 495                           const struct flow *, int max_ports);
 496 enum ofperr ofpacts_verify(const struct ofpact ofpacts[], size_t ofpacts_len);
 497
 498 /* Converting ofpacts to OpenFlow. */
 499 void ofpacts_put_openflow10(const struct ofpact[], size_t ofpacts_len,
 500                             struct ofpbuf *openflow);
 501 size_t ofpacts_put_openflow11_actions(const struct ofpact[], size_t ofpacts_len,
 502                                       struct ofpbuf *openflow);
 503 void ofpacts_put_openflow11_instructions(const struct ofpact[],
 504                                          size_t ofpacts_len,
 505                                          struct ofpbuf *openflow);
 506
 507 /* Working with ofpacts. */
 508 bool ofpacts_output_to_port(const struct ofpact[], size_t ofpacts_len,
 509                             uint16_t port);
 510 bool ofpacts_equal(const struct ofpact a[], size_t a_len,
 511                    const struct ofpact b[], size_t b_len);
 512
 513 /* Formatting ofpacts.
 514  *
 515  * (For parsing ofpacts, see ofp-parse.h.) */
 516 void ofpacts_format(const struct ofpact[], size_t ofpacts_len, struct ds *);
 517
 518 /* Internal use by the helpers below. */
 519 void ofpact_init(struct ofpact *, enum ofpact_type, size_t len);
 520 void *ofpact_put(struct ofpbuf *, enum ofpact_type, size_t len);
 521
 522 /* For each OFPACT_<ENUM> with a corresponding struct <STRUCT>, this defines
 523  * the following commonly useful functions:
 524  *
 525  *   struct <STRUCT> *ofpact_put_<ENUM>(struct ofpbuf *ofpacts);
 526  *
 527  *     Appends a new 'ofpact', of length OFPACT_<ENUM>_RAW_SIZE, to 'ofpacts',
 528  *     initializes it with ofpact_init_<ENUM>(), and returns it.  Also sets
 529  *     'ofpacts->l2' to the returned action.
 530  *
 531  *     After using this function to add a variable-length action, add the
 532  *     elements of the flexible array (e.g. with ofpbuf_put()), then use
 533  *     ofpact_update_len() to update the length embedded into the action.
 534  *     (Keep in mind the need to refresh the structure from 'ofpacts->l2' after
 535  *     adding data to 'ofpacts'.)
 536  *
 537  *   struct <STRUCT> *ofpact_get_<ENUM>(const struct ofpact *ofpact);
 538  *
 539  *     Returns 'ofpact' cast to "struct <STRUCT> *".  'ofpact->type' must be
 540  *     OFPACT_<ENUM>.
 541  *
 542  * as well as the following more rarely useful definitions:
 543  *
 544  *   void ofpact_init_<ENUM>(struct <STRUCT> *ofpact);
 545  *
 546  *     Initializes the parts of 'ofpact' that identify it as having type
 547  *     OFPACT_<ENUM> and length OFPACT_<ENUM>_RAW_SIZE and zeros the rest.
 548  *
 549  *   <ENUM>_RAW_SIZE
 550  *
 551  *     The size of the action structure.  For a fixed-length action, this is
 552  *     sizeof(struct <STRUCT>).  For a variable-length action, this is the
 553  *     offset to the variable-length part.
 554  *
 555  *   <ENUM>_SIZE
 556  *
 557  *     An integer constant, the value of OFPACT_<ENUM>_RAW_SIZE rounded up to a
 558  *     multiple of OFPACT_ALIGNTO.
 559  */
 560 #define DEFINE_OFPACT(ENUM, STRUCT, MEMBER)                             \
 561     BUILD_ASSERT_DECL(offsetof(struct STRUCT, ofpact) == 0);            \
 562                                                                         \
 563     enum { OFPACT_##ENUM##_RAW_SIZE                                     \
 564            = (offsetof(struct STRUCT, MEMBER)                           \
 565               ? offsetof(struct STRUCT, MEMBER)                         \
 566               : sizeof(struct STRUCT)) };                               \
 567                                                                         \
 568     enum { OFPACT_##ENUM##_SIZE                                         \
 569            = ROUND_UP(OFPACT_##ENUM##_RAW_SIZE, OFPACT_ALIGNTO) };      \
 570                                                                         \
 571     static inline struct STRUCT *                                       \
 572     ofpact_get_##ENUM(const struct ofpact *ofpact)                      \
 573     {                                                                   \
 574         ovs_assert(ofpact->type == OFPACT_##ENUM);                      \
 575         return (struct STRUCT *) ofpact;                                \
 576     }                                                                   \
 577                                                                         \
 578     static inline struct STRUCT *                                       \
 579     ofpact_put_##ENUM(struct ofpbuf *ofpacts)                           \
 580     {                                                                   \
 581         return ofpact_put(ofpacts, OFPACT_##ENUM,                       \
 582                           OFPACT_##ENUM##_RAW_SIZE);                    \
 583     }                                                                   \
 584                                                                         \
 585     static inline void                                                  \
 586     ofpact_init_##ENUM(struct STRUCT *ofpact)                           \
 587     {                                                                   \
 588         ofpact_init(&ofpact->ofpact, OFPACT_##ENUM,                     \
 589                     OFPACT_##ENUM##_RAW_SIZE);                          \
 590     }
 591 OFPACTS
 592 #undef DEFINE_OFPACT
 593
 594 /* Functions to use after adding ofpacts to a buffer. */
 595 void ofpact_update_len(struct ofpbuf *, struct ofpact *);
 596 void ofpact_pad(struct ofpbuf *);
 597
 598 /* OpenFlow 1.1 instructions.
 599  * The order is sorted in execution order. Not in the value of OFPIT11_xxx.
 600  * It is enforced on parser from text string.
 601  */
 602 #define OVS_INSTRUCTIONS                                    \
 603     DEFINE_INST(OFPIT11_APPLY_ACTIONS,                      \
 604                 ofp11_instruction_actions,        true,     \
 605                 "apply_actions")                            \
 606                                                             \
 607     DEFINE_INST(OFPIT11_CLEAR_ACTIONS,                      \
 608                 ofp11_instruction,                false,    \
 609                 "clear_actions")                            \
 610                                                             \
 611     DEFINE_INST(OFPIT11_WRITE_ACTIONS,                      \
 612                 ofp11_instruction_actions,        true,     \
 613                 "write_actions")                            \
 614                                                             \
 615     DEFINE_INST(OFPIT11_WRITE_METADATA,                     \
 616                 ofp11_instruction_write_metadata, false,    \
 617                 "write_metadata")                           \
 618                                                             \
 619     DEFINE_INST(OFPIT11_GOTO_TABLE,                         \
 620                 ofp11_instruction_goto_table,     false,    \
 621                 "goto_table")
 622
 623 enum ovs_instruction_type {
 624 #define DEFINE_INST(ENUM, STRUCT, EXTENSIBLE, NAME) OVSINST_##ENUM,
 625     OVS_INSTRUCTIONS
 626 #undef DEFINE_INST
 627 };
 628
 629 enum {
 630 #define DEFINE_INST(ENUM, STRUCT, EXTENSIBLE, NAME) + 1
 631     N_OVS_INSTRUCTIONS = OVS_INSTRUCTIONS
 632 #undef DEFINE_INST
 633 };
 634
 635
 636 static inline bool
 637 ofpact_is_instruction(const struct ofpact *a)
 638 {
 639     /* XXX Write-Actions */
 640     return a->type == OFPACT_CLEAR_ACTIONS
 641         || a->type == OFPACT_WRITE_METADATA
 642         || a->type == OFPACT_GOTO_TABLE;
 643 }
 644
 645 const char *ofpact_instruction_name_from_type(enum ovs_instruction_type type);
 646 int ofpact_instruction_type_from_name(const char *name);
 647
 648 void ofpact_set_field_init(struct ofpact_reg_load *load,
 649                            const struct mf_field *mf, const void *src);
 650
 651 #endif /* ofp-actions.h */