lib/ofp-actions.c

   1 /*
   2  * Copyright (c) 2008, 2009, 2010, 2011, 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 #include <config.h>
  18 #include "ofp-actions.h"
  19 #include "bundle.h"
  20 #include "byte-order.h"
  21 #include "compiler.h"
  22 #include "dynamic-string.h"
  23 #include "learn.h"
  24 #include "meta-flow.h"
  25 #include "multipath.h"
  26 #include "nx-match.h"
  27 #include "ofp-util.h"
  28 #include "ofpbuf.h"
  29 #include "util.h"
  30 #include "vlog.h"
  31
  32 VLOG_DEFINE_THIS_MODULE(ofp_actions);
  33
  34 static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(1, 5);
  35 \f
  36 /* Converting OpenFlow 1.0 to ofpacts. */
  37
  38 static enum ofperr
  39 output_from_openflow10(const struct ofp10_action_output *oao,
  40                        struct ofpbuf *out)
  41 {
  42     struct ofpact_output *output;
  43
  44     output = ofpact_put_OUTPUT(out);
  45     output->port = u16_to_ofp(ntohs(oao->port));
  46     output->max_len = ntohs(oao->max_len);
  47
  48     return ofputil_check_output_port(output->port, OFPP_MAX);
  49 }
  50
  51 static enum ofperr
  52 enqueue_from_openflow10(const struct ofp10_action_enqueue *oae,
  53                         struct ofpbuf *out)
  54 {
  55     struct ofpact_enqueue *enqueue;
  56
  57     enqueue = ofpact_put_ENQUEUE(out);
  58     enqueue->port = u16_to_ofp(ntohs(oae->port));
  59     enqueue->queue = ntohl(oae->queue_id);
  60     if (ofp_to_u16(enqueue->port) >= ofp_to_u16(OFPP_MAX)
  61         && enqueue->port != OFPP_IN_PORT
  62         && enqueue->port != OFPP_LOCAL) {
  63         return OFPERR_OFPBAC_BAD_OUT_PORT;
  64     }
  65     return 0;
  66 }
  67
  68 static void
  69 resubmit_from_openflow(const struct nx_action_resubmit *nar,
  70                        struct ofpbuf *out)
  71 {
  72     struct ofpact_resubmit *resubmit;
  73
  74     resubmit = ofpact_put_RESUBMIT(out);
  75     resubmit->ofpact.compat = OFPUTIL_NXAST_RESUBMIT;
  76     resubmit->in_port = u16_to_ofp(ntohs(nar->in_port));
  77     resubmit->table_id = 0xff;
  78 }
  79
  80 static enum ofperr
  81 resubmit_table_from_openflow(const struct nx_action_resubmit *nar,
  82                              struct ofpbuf *out)
  83 {
  84     struct ofpact_resubmit *resubmit;
  85
  86     if (nar->pad[0] || nar->pad[1] || nar->pad[2]) {
  87         return OFPERR_OFPBAC_BAD_ARGUMENT;
  88     }
  89
  90     resubmit = ofpact_put_RESUBMIT(out);
  91     resubmit->ofpact.compat = OFPUTIL_NXAST_RESUBMIT_TABLE;
  92     resubmit->in_port = u16_to_ofp(ntohs(nar->in_port));
  93     resubmit->table_id = nar->table;
  94     return 0;
  95 }
  96
  97 static enum ofperr
  98 output_reg_from_openflow(const struct nx_action_output_reg *naor,
  99                          struct ofpbuf *out)
 100 {
 101     struct ofpact_output_reg *output_reg;
 102
 103     if (!is_all_zeros(naor->zero, sizeof naor->zero)) {
 104         return OFPERR_OFPBAC_BAD_ARGUMENT;
 105     }
 106
 107     output_reg = ofpact_put_OUTPUT_REG(out);
 108     output_reg->src.field = mf_from_nxm_header(ntohl(naor->src));
 109     output_reg->src.ofs = nxm_decode_ofs(naor->ofs_nbits);
 110     output_reg->src.n_bits = nxm_decode_n_bits(naor->ofs_nbits);
 111     output_reg->max_len = ntohs(naor->max_len);
 112
 113     return mf_check_src(&output_reg->src, NULL);
 114 }
 115
 116 static void
 117 fin_timeout_from_openflow(const struct nx_action_fin_timeout *naft,
 118                           struct ofpbuf *out)
 119 {
 120     struct ofpact_fin_timeout *oft;
 121
 122     oft = ofpact_put_FIN_TIMEOUT(out);
 123     oft->fin_idle_timeout = ntohs(naft->fin_idle_timeout);
 124     oft->fin_hard_timeout = ntohs(naft->fin_hard_timeout);
 125 }
 126
 127 static void
 128 controller_from_openflow(const struct nx_action_controller *nac,
 129                          struct ofpbuf *out)
 130 {
 131     struct ofpact_controller *oc;
 132
 133     oc = ofpact_put_CONTROLLER(out);
 134     oc->max_len = ntohs(nac->max_len);
 135     oc->controller_id = ntohs(nac->controller_id);
 136     oc->reason = nac->reason;
 137 }
 138
 139 static enum ofperr
 140 metadata_from_nxast(const struct nx_action_write_metadata *nawm,
 141                     struct ofpbuf *out)
 142 {
 143     struct ofpact_metadata *om;
 144
 145     if (!is_all_zeros(nawm->zeros, sizeof nawm->zeros)) {
 146         return OFPERR_NXBRC_MUST_BE_ZERO;
 147     }
 148
 149     om = ofpact_put_WRITE_METADATA(out);
 150     om->metadata = nawm->metadata;
 151     om->mask = nawm->mask;
 152
 153     return 0;
 154 }
 155
 156 static void
 157 note_from_openflow(const struct nx_action_note *nan, struct ofpbuf *out)
 158 {
 159     struct ofpact_note *note;
 160     unsigned int length;
 161
 162     length = ntohs(nan->len) - offsetof(struct nx_action_note, note);
 163     note = ofpact_put(out, OFPACT_NOTE,
 164                       offsetof(struct ofpact_note, data) + length);
 165     note->length = length;
 166     memcpy(note->data, nan->note, length);
 167 }
 168
 169 static enum ofperr
 170 dec_ttl_from_openflow(struct ofpbuf *out, enum ofputil_action_code compat)
 171 {
 172     uint16_t id = 0;
 173     struct ofpact_cnt_ids *ids;
 174     enum ofperr error = 0;
 175
 176     ids = ofpact_put_DEC_TTL(out);
 177     ids->ofpact.compat = compat;
 178     ids->n_controllers = 1;
 179     ofpbuf_put(out, &id, sizeof id);
 180     ids = out->l2;
 181     ofpact_update_len(out, &ids->ofpact);
 182     return error;
 183 }
 184
 185 static enum ofperr
 186 dec_ttl_cnt_ids_from_openflow(const struct nx_action_cnt_ids *nac_ids,
 187                       struct ofpbuf *out)
 188 {
 189     struct ofpact_cnt_ids *ids;
 190     size_t ids_size;
 191     int i;
 192
 193     ids = ofpact_put_DEC_TTL(out);
 194     ids->ofpact.compat = OFPUTIL_NXAST_DEC_TTL_CNT_IDS;
 195     ids->n_controllers = ntohs(nac_ids->n_controllers);
 196     ids_size = ntohs(nac_ids->len) - sizeof *nac_ids;
 197
 198     if (!is_all_zeros(nac_ids->zeros, sizeof nac_ids->zeros)) {
 199         return OFPERR_NXBRC_MUST_BE_ZERO;
 200     }
 201
 202     if (ids_size < ids->n_controllers * sizeof(ovs_be16)) {
 203         VLOG_WARN_RL(&rl, "Nicira action dec_ttl_cnt_ids only has %zu bytes "
 204                      "allocated for controller ids.  %zu bytes are required for "
 205                      "%"PRIu16" controllers.", ids_size,
 206                      ids->n_controllers * sizeof(ovs_be16), ids->n_controllers);
 207         return OFPERR_OFPBAC_BAD_LEN;
 208     }
 209
 210     for (i = 0; i < ids->n_controllers; i++) {
 211         uint16_t id = ntohs(((ovs_be16 *)(nac_ids + 1))[i]);
 212         ofpbuf_put(out, &id, sizeof id);
 213         ids = out->l2;
 214     }
 215
 216     ofpact_update_len(out, &ids->ofpact);
 217
 218     return 0;
 219 }
 220
 221 static enum ofperr
 222 sample_from_openflow(const struct nx_action_sample *nas,
 223                      struct ofpbuf *out)
 224 {
 225     struct ofpact_sample *sample;
 226
 227     sample = ofpact_put_SAMPLE(out);
 228     sample->probability = ntohs(nas->probability);
 229     sample->collector_set_id = ntohl(nas->collector_set_id);
 230     sample->obs_domain_id = ntohl(nas->obs_domain_id);
 231     sample->obs_point_id = ntohl(nas->obs_point_id);
 232
 233     if (sample->probability == 0) {
 234         return OFPERR_OFPBAC_BAD_ARGUMENT;
 235     }
 236
 237     return 0;
 238 }
 239
 240 static enum ofperr
 241 decode_nxast_action(const union ofp_action *a, enum ofputil_action_code *code)
 242 {
 243     const struct nx_action_header *nah = (const struct nx_action_header *) a;
 244     uint16_t len = ntohs(a->header.len);
 245
 246     if (len < sizeof(struct nx_action_header)) {
 247         return OFPERR_OFPBAC_BAD_LEN;
 248     } else if (a->vendor.vendor != CONSTANT_HTONL(NX_VENDOR_ID)) {
 249         return OFPERR_OFPBAC_BAD_VENDOR;
 250     }
 251
 252     switch (nah->subtype) {
 253 #define NXAST_ACTION(ENUM, STRUCT, EXTENSIBLE, NAME)    \
 254         case CONSTANT_HTONS(ENUM):                      \
 255             if (EXTENSIBLE                              \
 256                 ? len >= sizeof(struct STRUCT)          \
 257                 : len == sizeof(struct STRUCT)) {       \
 258                 *code = OFPUTIL_##ENUM;                 \
 259                 return 0;                               \
 260             } else {                                    \
 261                 return OFPERR_OFPBAC_BAD_LEN;           \
 262             }                                           \
 263             NOT_REACHED();
 264 #include "ofp-util.def"
 265
 266     case CONSTANT_HTONS(NXAST_SNAT__OBSOLETE):
 267     case CONSTANT_HTONS(NXAST_DROP_SPOOFED_ARP__OBSOLETE):
 268     default:
 269         return OFPERR_OFPBAC_BAD_TYPE;
 270     }
 271 }
 272
 273 /* Parses 'a' to determine its type.  On success stores the correct type into
 274  * '*code' and returns 0.  On failure returns an OFPERR_* error code and
 275  * '*code' is indeterminate.
 276  *
 277  * The caller must have already verified that 'a''s length is potentially
 278  * correct (that is, a->header.len is nonzero and a multiple of sizeof(union
 279  * ofp_action) and no longer than the amount of space allocated to 'a').
 280  *
 281  * This function verifies that 'a''s length is correct for the type of action
 282  * that it represents. */
 283 static enum ofperr
 284 decode_openflow10_action(const union ofp_action *a,
 285                          enum ofputil_action_code *code)
 286 {
 287     switch (a->type) {
 288     case CONSTANT_HTONS(OFPAT10_VENDOR):
 289         return decode_nxast_action(a, code);
 290
 291 #define OFPAT10_ACTION(ENUM, STRUCT, NAME)                          \
 292         case CONSTANT_HTONS(ENUM):                                  \
 293             if (a->header.len == htons(sizeof(struct STRUCT))) {    \
 294                 *code = OFPUTIL_##ENUM;                             \
 295                 return 0;                                           \
 296             } else {                                                \
 297                 return OFPERR_OFPBAC_BAD_LEN;                       \
 298             }                                                       \
 299             break;
 300 #include "ofp-util.def"
 301
 302     default:
 303         return OFPERR_OFPBAC_BAD_TYPE;
 304     }
 305 }
 306
 307 static enum ofperr
 308 ofpact_from_nxast(const union ofp_action *a, enum ofputil_action_code code,
 309                   struct ofpbuf *out)
 310 {
 311     const struct nx_action_resubmit *nar;
 312     const struct nx_action_set_tunnel *nast;
 313     const struct nx_action_set_queue *nasq;
 314     const struct nx_action_note *nan;
 315     const struct nx_action_set_tunnel64 *nast64;
 316     const struct nx_action_write_metadata *nawm;
 317     struct ofpact_tunnel *tunnel;
 318     enum ofperr error = 0;
 319
 320     switch (code) {
 321     case OFPUTIL_ACTION_INVALID:
 322 #define OFPAT10_ACTION(ENUM, STRUCT, NAME) case OFPUTIL_##ENUM:
 323 #define OFPAT11_ACTION(ENUM, STRUCT, EXTENSIBLE, NAME) case OFPUTIL_##ENUM:
 324 #include "ofp-util.def"
 325         NOT_REACHED();
 326
 327     case OFPUTIL_NXAST_RESUBMIT:
 328         resubmit_from_openflow((const struct nx_action_resubmit *) a, out);
 329         break;
 330
 331     case OFPUTIL_NXAST_SET_TUNNEL:
 332         nast = (const struct nx_action_set_tunnel *) a;
 333         tunnel = ofpact_put_SET_TUNNEL(out);
 334         tunnel->ofpact.compat = code;
 335         tunnel->tun_id = ntohl(nast->tun_id);
 336         break;
 337
 338     case OFPUTIL_NXAST_WRITE_METADATA:
 339         nawm = (const struct nx_action_write_metadata *) a;
 340         error = metadata_from_nxast(nawm, out);
 341         break;
 342
 343     case OFPUTIL_NXAST_SET_QUEUE:
 344         nasq = (const struct nx_action_set_queue *) a;
 345         ofpact_put_SET_QUEUE(out)->queue_id = ntohl(nasq->queue_id);
 346         break;
 347
 348     case OFPUTIL_NXAST_POP_QUEUE:
 349         ofpact_put_POP_QUEUE(out);
 350         break;
 351
 352     case OFPUTIL_NXAST_REG_MOVE:
 353         error = nxm_reg_move_from_openflow(
 354             (const struct nx_action_reg_move *) a, out);
 355         break;
 356
 357     case OFPUTIL_NXAST_REG_LOAD:
 358         error = nxm_reg_load_from_openflow(
 359             (const struct nx_action_reg_load *) a, out);
 360         break;
 361
 362     case OFPUTIL_NXAST_STACK_PUSH:
 363         error = nxm_stack_push_from_openflow(
 364             (const struct nx_action_stack *) a, out);
 365         break;
 366
 367     case OFPUTIL_NXAST_STACK_POP:
 368         error = nxm_stack_pop_from_openflow(
 369             (const struct nx_action_stack *) a, out);
 370         break;
 371
 372     case OFPUTIL_NXAST_NOTE:
 373         nan = (const struct nx_action_note *) a;
 374         note_from_openflow(nan, out);
 375         break;
 376
 377     case OFPUTIL_NXAST_SET_TUNNEL64:
 378         nast64 = (const struct nx_action_set_tunnel64 *) a;
 379         tunnel = ofpact_put_SET_TUNNEL(out);
 380         tunnel->ofpact.compat = code;
 381         tunnel->tun_id = ntohll(nast64->tun_id);
 382         break;
 383
 384     case OFPUTIL_NXAST_MULTIPATH:
 385         error = multipath_from_openflow((const struct nx_action_multipath *) a,
 386                                         ofpact_put_MULTIPATH(out));
 387         break;
 388
 389     case OFPUTIL_NXAST_BUNDLE:
 390     case OFPUTIL_NXAST_BUNDLE_LOAD:
 391         error = bundle_from_openflow((const struct nx_action_bundle *) a, out);
 392         break;
 393
 394     case OFPUTIL_NXAST_OUTPUT_REG:
 395         error = output_reg_from_openflow(
 396             (const struct nx_action_output_reg *) a, out);
 397         break;
 398
 399     case OFPUTIL_NXAST_RESUBMIT_TABLE:
 400         nar = (const struct nx_action_resubmit *) a;
 401         error = resubmit_table_from_openflow(nar, out);
 402         break;
 403
 404     case OFPUTIL_NXAST_LEARN:
 405         error = learn_from_openflow((const struct nx_action_learn *) a, out);
 406         break;
 407
 408     case OFPUTIL_NXAST_EXIT:
 409         ofpact_put_EXIT(out);
 410         break;
 411
 412     case OFPUTIL_NXAST_DEC_TTL:
 413         error = dec_ttl_from_openflow(out, code);
 414         break;
 415
 416     case OFPUTIL_NXAST_DEC_TTL_CNT_IDS:
 417         error = dec_ttl_cnt_ids_from_openflow(
 418                     (const struct nx_action_cnt_ids *) a, out);
 419         break;
 420
 421     case OFPUTIL_NXAST_FIN_TIMEOUT:
 422         fin_timeout_from_openflow(
 423             (const struct nx_action_fin_timeout *) a, out);
 424         break;
 425
 426     case OFPUTIL_NXAST_CONTROLLER:
 427         controller_from_openflow((const struct nx_action_controller *) a, out);
 428         break;
 429
 430     case OFPUTIL_NXAST_PUSH_MPLS: {
 431         struct nx_action_push_mpls *nxapm = (struct nx_action_push_mpls *)a;
 432         if (!eth_type_mpls(nxapm->ethertype)) {
 433             return OFPERR_OFPBAC_BAD_ARGUMENT;
 434         }
 435         ofpact_put_PUSH_MPLS(out)->ethertype = nxapm->ethertype;
 436         break;
 437     }
 438
 439     case OFPUTIL_NXAST_SET_MPLS_TTL: {
 440         struct nx_action_mpls_ttl *nxamt = (struct nx_action_mpls_ttl *)a;
 441         ofpact_put_SET_MPLS_TTL(out)->ttl = nxamt->ttl;
 442         break;
 443     }
 444
 445     case OFPUTIL_NXAST_DEC_MPLS_TTL:
 446         ofpact_put_DEC_MPLS_TTL(out);
 447         break;
 448
 449     case OFPUTIL_NXAST_POP_MPLS: {
 450         struct nx_action_pop_mpls *nxapm = (struct nx_action_pop_mpls *)a;
 451         if (eth_type_mpls(nxapm->ethertype)) {
 452             return OFPERR_OFPBAC_BAD_ARGUMENT;
 453         }
 454         ofpact_put_POP_MPLS(out)->ethertype = nxapm->ethertype;
 455         break;
 456     }
 457
 458     case OFPUTIL_NXAST_SAMPLE:
 459         error = sample_from_openflow(
 460             (const struct nx_action_sample *) a, out);
 461         break;
 462     }
 463
 464     return error;
 465 }
 466
 467 static enum ofperr
 468 ofpact_from_openflow10(const union ofp_action *a, struct ofpbuf *out)
 469 {
 470     enum ofputil_action_code code;
 471     enum ofperr error;
 472
 473     error = decode_openflow10_action(a, &code);
 474     if (error) {
 475         return error;
 476     }
 477
 478     switch (code) {
 479     case OFPUTIL_ACTION_INVALID:
 480 #define OFPAT11_ACTION(ENUM, STRUCT, EXTENSIBLE, NAME) case OFPUTIL_##ENUM:
 481 #include "ofp-util.def"
 482         NOT_REACHED();
 483
 484     case OFPUTIL_OFPAT10_OUTPUT:
 485         return output_from_openflow10(&a->output10, out);
 486
 487     case OFPUTIL_OFPAT10_SET_VLAN_VID:
 488         if (a->vlan_vid.vlan_vid & ~htons(0xfff)) {
 489             return OFPERR_OFPBAC_BAD_ARGUMENT;
 490         }
 491         ofpact_put_SET_VLAN_VID(out)->vlan_vid = ntohs(a->vlan_vid.vlan_vid);
 492         break;
 493
 494     case OFPUTIL_OFPAT10_SET_VLAN_PCP:
 495         if (a->vlan_pcp.vlan_pcp & ~7) {
 496             return OFPERR_OFPBAC_BAD_ARGUMENT;
 497         }
 498         ofpact_put_SET_VLAN_PCP(out)->vlan_pcp = a->vlan_pcp.vlan_pcp;
 499         break;
 500
 501     case OFPUTIL_OFPAT10_STRIP_VLAN:
 502         ofpact_put_STRIP_VLAN(out);
 503         break;
 504
 505     case OFPUTIL_OFPAT10_SET_DL_SRC:
 506         memcpy(ofpact_put_SET_ETH_SRC(out)->mac,
 507                ((const struct ofp_action_dl_addr *) a)->dl_addr, ETH_ADDR_LEN);
 508         break;
 509
 510     case OFPUTIL_OFPAT10_SET_DL_DST:
 511         memcpy(ofpact_put_SET_ETH_DST(out)->mac,
 512                ((const struct ofp_action_dl_addr *) a)->dl_addr, ETH_ADDR_LEN);
 513         break;
 514
 515     case OFPUTIL_OFPAT10_SET_NW_SRC:
 516         ofpact_put_SET_IPV4_SRC(out)->ipv4 = a->nw_addr.nw_addr;
 517         break;
 518
 519     case OFPUTIL_OFPAT10_SET_NW_DST:
 520         ofpact_put_SET_IPV4_DST(out)->ipv4 = a->nw_addr.nw_addr;
 521         break;
 522
 523     case OFPUTIL_OFPAT10_SET_NW_TOS:
 524         if (a->nw_tos.nw_tos & ~IP_DSCP_MASK) {
 525             return OFPERR_OFPBAC_BAD_ARGUMENT;
 526         }
 527         ofpact_put_SET_IPV4_DSCP(out)->dscp = a->nw_tos.nw_tos;
 528         break;
 529
 530     case OFPUTIL_OFPAT10_SET_TP_SRC:
 531         ofpact_put_SET_L4_SRC_PORT(out)->port = ntohs(a->tp_port.tp_port);
 532         break;
 533
 534     case OFPUTIL_OFPAT10_SET_TP_DST:
 535         ofpact_put_SET_L4_DST_PORT(out)->port = ntohs(a->tp_port.tp_port);
 536
 537         break;
 538
 539     case OFPUTIL_OFPAT10_ENQUEUE:
 540         error = enqueue_from_openflow10((const struct ofp10_action_enqueue *) a,
 541                                         out);
 542         break;
 543
 544 #define NXAST_ACTION(ENUM, STRUCT, EXTENSIBLE, NAME) case OFPUTIL_##ENUM:
 545 #include "ofp-util.def"
 546         return ofpact_from_nxast(a, code, out);
 547     }
 548
 549     return error;
 550 }
 551
 552 static inline union ofp_action *
 553 action_next(const union ofp_action *a)
 554 {
 555     return ((union ofp_action *) (void *)
 556             ((uint8_t *) a + ntohs(a->header.len)));
 557 }
 558
 559 static inline bool
 560 action_is_valid(const union ofp_action *a, size_t n_actions)
 561 {
 562     uint16_t len = ntohs(a->header.len);
 563     return (!(len % OFP_ACTION_ALIGN)
 564             && len >= sizeof *a
 565             && len / sizeof *a <= n_actions);
 566 }
 567
 568 /* This macro is careful to check for actions with bad lengths. */
 569 #define ACTION_FOR_EACH(ITER, LEFT, ACTIONS, N_ACTIONS)                 \
 570     for ((ITER) = (ACTIONS), (LEFT) = (N_ACTIONS);                      \
 571          (LEFT) > 0 && action_is_valid(ITER, LEFT);                     \
 572          ((LEFT) -= ntohs((ITER)->header.len) / sizeof(union ofp_action), \
 573           (ITER) = action_next(ITER)))
 574
 575 static void
 576 log_bad_action(const union ofp_action *actions, size_t n_actions, size_t ofs,
 577                enum ofperr error)
 578 {
 579     if (!VLOG_DROP_WARN(&rl)) {
 580         struct ds s;
 581
 582         ds_init(&s);
 583         ds_put_hex_dump(&s, actions, n_actions * sizeof *actions, 0, false);
 584         VLOG_WARN("bad action at offset %#zx (%s):\n%s",
 585                   ofs * sizeof *actions, ofperr_get_name(error), ds_cstr(&s));
 586         ds_destroy(&s);
 587     }
 588 }
 589
 590 static enum ofperr
 591 ofpacts_from_openflow(const union ofp_action *in, size_t n_in,
 592                       struct ofpbuf *out,
 593                       enum ofperr (*ofpact_from_openflow)(
 594                           const union ofp_action *a, struct ofpbuf *out))
 595 {
 596     const union ofp_action *a;
 597     size_t left;
 598
 599     ACTION_FOR_EACH (a, left, in, n_in) {
 600         enum ofperr error = ofpact_from_openflow(a, out);
 601         if (error) {
 602             log_bad_action(in, n_in, a - in, error);
 603             return error;
 604         }
 605     }
 606     if (left) {
 607         enum ofperr error = OFPERR_OFPBAC_BAD_LEN;
 608         log_bad_action(in, n_in, n_in - left, error);
 609         return error;
 610     }
 611
 612     ofpact_pad(out);
 613     return 0;
 614 }
 615
 616 static enum ofperr
 617 ofpacts_from_openflow10(const union ofp_action *in, size_t n_in,
 618                         struct ofpbuf *out)
 619 {
 620     return ofpacts_from_openflow(in, n_in, out, ofpact_from_openflow10);
 621 }
 622
 623 static enum ofperr
 624 ofpacts_pull_actions(struct ofpbuf *openflow, unsigned int actions_len,
 625                      struct ofpbuf *ofpacts,
 626                      enum ofperr (*translate)(const union ofp_action *actions,
 627                                               size_t n_actions,
 628                                               struct ofpbuf *ofpacts))
 629 {
 630     static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(1, 5);
 631     const union ofp_action *actions;
 632     enum ofperr error;
 633
 634     ofpbuf_clear(ofpacts);
 635
 636     if (actions_len % OFP_ACTION_ALIGN != 0) {
 637         VLOG_WARN_RL(&rl, "OpenFlow message actions length %u is not a "
 638                      "multiple of %d", actions_len, OFP_ACTION_ALIGN);
 639         return OFPERR_OFPBRC_BAD_LEN;
 640     }
 641
 642     actions = ofpbuf_try_pull(openflow, actions_len);
 643     if (actions == NULL) {
 644         VLOG_WARN_RL(&rl, "OpenFlow message actions length %u exceeds "
 645                      "remaining message length (%zu)",
 646                      actions_len, openflow->size);
 647         return OFPERR_OFPBRC_BAD_LEN;
 648     }
 649
 650     error = translate(actions, actions_len / OFP_ACTION_ALIGN, ofpacts);
 651     if (error) {
 652         ofpbuf_clear(ofpacts);
 653         return error;
 654     }
 655
 656     error = ofpacts_verify(ofpacts->data, ofpacts->size);
 657     if (error) {
 658         ofpbuf_clear(ofpacts);
 659     }
 660     return error;
 661 }
 662
 663 /* Attempts to convert 'actions_len' bytes of OpenFlow 1.0 actions from the
 664  * front of 'openflow' into ofpacts.  On success, replaces any existing content
 665  * in 'ofpacts' by the converted ofpacts; on failure, clears 'ofpacts'.
 666  * Returns 0 if successful, otherwise an OpenFlow error.
 667  *
 668  * The parsed actions are valid generically, but they may not be valid in a
 669  * specific context.  For example, port numbers up to OFPP_MAX are valid
 670  * generically, but specific datapaths may only support port numbers in a
 671  * smaller range.  Use ofpacts_check() to additional check whether actions are
 672  * valid in a specific context. */
 673 enum ofperr
 674 ofpacts_pull_openflow10(struct ofpbuf *openflow, unsigned int actions_len,
 675                         struct ofpbuf *ofpacts)
 676 {
 677     return ofpacts_pull_actions(openflow, actions_len, ofpacts,
 678                                 ofpacts_from_openflow10);
 679 }
 680 \f
 681 /* OpenFlow 1.1 actions. */
 682
 683 /* Parses 'a' to determine its type.  On success stores the correct type into
 684  * '*code' and returns 0.  On failure returns an OFPERR_* error code and
 685  * '*code' is indeterminate.
 686  *
 687  * The caller must have already verified that 'a''s length is potentially
 688  * correct (that is, a->header.len is nonzero and a multiple of sizeof(union
 689  * ofp_action) and no longer than the amount of space allocated to 'a').
 690  *
 691  * This function verifies that 'a''s length is correct for the type of action
 692  * that it represents. */
 693 static enum ofperr
 694 decode_openflow11_action(const union ofp_action *a,
 695                          enum ofputil_action_code *code)
 696 {
 697     uint16_t len;
 698
 699     switch (a->type) {
 700     case CONSTANT_HTONS(OFPAT11_EXPERIMENTER):
 701         return decode_nxast_action(a, code);
 702
 703 #define OFPAT11_ACTION(ENUM, STRUCT, EXTENSIBLE, NAME)  \
 704         case CONSTANT_HTONS(ENUM):                      \
 705             len = ntohs(a->header.len);                 \
 706             if (EXTENSIBLE                              \
 707                 ? len >= sizeof(struct STRUCT)          \
 708                 : len == sizeof(struct STRUCT)) {       \
 709                 *code = OFPUTIL_##ENUM;                 \
 710                 return 0;                               \
 711             } else {                                    \
 712                 return OFPERR_OFPBAC_BAD_LEN;           \
 713             }                                           \
 714             NOT_REACHED();
 715 #include "ofp-util.def"
 716
 717     default:
 718         return OFPERR_OFPBAC_BAD_TYPE;
 719     }
 720 }
 721
 722 static enum ofperr
 723 output_from_openflow11(const struct ofp11_action_output *oao,
 724                        struct ofpbuf *out)
 725 {
 726     struct ofpact_output *output;
 727     enum ofperr error;
 728
 729     output = ofpact_put_OUTPUT(out);
 730     output->max_len = ntohs(oao->max_len);
 731
 732     error = ofputil_port_from_ofp11(oao->port, &output->port);
 733     if (error) {
 734         return error;
 735     }
 736
 737     return ofputil_check_output_port(output->port, OFPP_MAX);
 738 }
 739
 740 static enum ofperr
 741 ofpact_from_openflow11(const union ofp_action *a, struct ofpbuf *out)
 742 {
 743     enum ofputil_action_code code;
 744     enum ofperr error;
 745
 746     error = decode_openflow11_action(a, &code);
 747     if (error) {
 748         return error;
 749     }
 750
 751     switch (code) {
 752     case OFPUTIL_ACTION_INVALID:
 753 #define OFPAT10_ACTION(ENUM, STRUCT, NAME) case OFPUTIL_##ENUM:
 754 #include "ofp-util.def"
 755         NOT_REACHED();
 756
 757     case OFPUTIL_OFPAT11_OUTPUT:
 758         return output_from_openflow11((const struct ofp11_action_output *) a,
 759                                       out);
 760
 761     case OFPUTIL_OFPAT11_SET_VLAN_VID:
 762         if (a->vlan_vid.vlan_vid & ~htons(0xfff)) {
 763             return OFPERR_OFPBAC_BAD_ARGUMENT;
 764         }
 765         ofpact_put_SET_VLAN_VID(out)->vlan_vid = ntohs(a->vlan_vid.vlan_vid);
 766         break;
 767
 768     case OFPUTIL_OFPAT11_SET_VLAN_PCP:
 769         if (a->vlan_pcp.vlan_pcp & ~7) {
 770             return OFPERR_OFPBAC_BAD_ARGUMENT;
 771         }
 772         ofpact_put_SET_VLAN_PCP(out)->vlan_pcp = a->vlan_pcp.vlan_pcp;
 773         break;
 774
 775     case OFPUTIL_OFPAT11_PUSH_VLAN:
 776         if (((const struct ofp11_action_push *)a)->ethertype !=
 777             htons(ETH_TYPE_VLAN_8021Q)) {
 778             /* XXX 802.1AD(QinQ) isn't supported at the moment */
 779             return OFPERR_OFPBAC_BAD_ARGUMENT;
 780         }
 781         ofpact_put_PUSH_VLAN(out);
 782         break;
 783
 784     case OFPUTIL_OFPAT11_POP_VLAN:
 785         ofpact_put_STRIP_VLAN(out);
 786         break;
 787
 788     case OFPUTIL_OFPAT11_SET_QUEUE:
 789         ofpact_put_SET_QUEUE(out)->queue_id =
 790             ntohl(((const struct ofp11_action_set_queue *)a)->queue_id);
 791         break;
 792
 793     case OFPUTIL_OFPAT11_SET_DL_SRC:
 794         memcpy(ofpact_put_SET_ETH_SRC(out)->mac,
 795                ((const struct ofp_action_dl_addr *) a)->dl_addr, ETH_ADDR_LEN);
 796         break;
 797
 798     case OFPUTIL_OFPAT11_SET_DL_DST:
 799         memcpy(ofpact_put_SET_ETH_DST(out)->mac,
 800                ((const struct ofp_action_dl_addr *) a)->dl_addr, ETH_ADDR_LEN);
 801         break;
 802
 803     case OFPUTIL_OFPAT11_DEC_NW_TTL:
 804         dec_ttl_from_openflow(out, code);
 805         break;
 806
 807     case OFPUTIL_OFPAT11_SET_NW_SRC:
 808         ofpact_put_SET_IPV4_SRC(out)->ipv4 = a->nw_addr.nw_addr;
 809         break;
 810
 811     case OFPUTIL_OFPAT11_SET_NW_DST:
 812         ofpact_put_SET_IPV4_DST(out)->ipv4 = a->nw_addr.nw_addr;
 813         break;
 814
 815     case OFPUTIL_OFPAT11_SET_NW_TOS:
 816         if (a->nw_tos.nw_tos & ~IP_DSCP_MASK) {
 817             return OFPERR_OFPBAC_BAD_ARGUMENT;
 818         }
 819         ofpact_put_SET_IPV4_DSCP(out)->dscp = a->nw_tos.nw_tos;
 820         break;
 821
 822     case OFPUTIL_OFPAT11_SET_TP_SRC:
 823         ofpact_put_SET_L4_SRC_PORT(out)->port = ntohs(a->tp_port.tp_port);
 824         break;
 825
 826     case OFPUTIL_OFPAT11_SET_TP_DST:
 827         ofpact_put_SET_L4_DST_PORT(out)->port = ntohs(a->tp_port.tp_port);
 828         break;
 829
 830     case OFPUTIL_OFPAT12_SET_FIELD:
 831         return nxm_reg_load_from_openflow12_set_field(
 832             (const struct ofp12_action_set_field *)a, out);
 833
 834     case OFPUTIL_OFPAT11_SET_MPLS_TTL: {
 835         struct ofp11_action_mpls_ttl *oamt = (struct ofp11_action_mpls_ttl *)a;
 836         ofpact_put_SET_MPLS_TTL(out)->ttl = oamt->mpls_ttl;
 837         break;
 838     }
 839
 840     case OFPUTIL_OFPAT11_DEC_MPLS_TTL:
 841         ofpact_put_DEC_MPLS_TTL(out);
 842         break;
 843
 844     case OFPUTIL_OFPAT11_PUSH_MPLS: {
 845         struct ofp11_action_push *oap = (struct ofp11_action_push *)a;
 846         if (!eth_type_mpls(oap->ethertype)) {
 847             return OFPERR_OFPBAC_BAD_ARGUMENT;
 848         }
 849         ofpact_put_PUSH_MPLS(out)->ethertype = oap->ethertype;
 850         break;
 851     }
 852
 853     case OFPUTIL_OFPAT11_POP_MPLS: {
 854         struct ofp11_action_pop_mpls *oapm = (struct ofp11_action_pop_mpls *)a;
 855         if (eth_type_mpls(oapm->ethertype)) {
 856             return OFPERR_OFPBAC_BAD_ARGUMENT;
 857         }
 858         ofpact_put_POP_MPLS(out)->ethertype = oapm->ethertype;
 859         break;
 860     }
 861
 862 #define NXAST_ACTION(ENUM, STRUCT, EXTENSIBLE, NAME) case OFPUTIL_##ENUM:
 863 #include "ofp-util.def"
 864         return ofpact_from_nxast(a, code, out);
 865     }
 866
 867     return error;
 868 }
 869
 870 static enum ofperr
 871 ofpacts_from_openflow11(const union ofp_action *in, size_t n_in,
 872                         struct ofpbuf *out)
 873 {
 874     return ofpacts_from_openflow(in, n_in, out, ofpact_from_openflow11);
 875 }
 876 \f
 877 /* OpenFlow 1.1 instructions. */
 878
 879 #define DEFINE_INST(ENUM, STRUCT, EXTENSIBLE, NAME)             \
 880     static inline const struct STRUCT *                         \
 881     instruction_get_##ENUM(const struct ofp11_instruction *inst)\
 882     {                                                           \
 883         ovs_assert(inst->type == htons(ENUM));                  \
 884         return (struct STRUCT *)inst;                           \
 885     }                                                           \
 886                                                                 \
 887     static inline void                                          \
 888     instruction_init_##ENUM(struct STRUCT *s)                   \
 889     {                                                           \
 890         memset(s, 0, sizeof *s);                                \
 891         s->type = htons(ENUM);                                  \
 892         s->len = htons(sizeof *s);                              \
 893     }                                                           \
 894                                                                 \
 895     static inline struct STRUCT *                               \
 896     instruction_put_##ENUM(struct ofpbuf *buf)                  \
 897     {                                                           \
 898         struct STRUCT *s = ofpbuf_put_uninit(buf, sizeof *s);   \
 899         instruction_init_##ENUM(s);                             \
 900         return s;                                               \
 901     }
 902 OVS_INSTRUCTIONS
 903 #undef DEFINE_INST
 904
 905 struct instruction_type_info {
 906     enum ovs_instruction_type type;
 907     const char *name;
 908 };
 909
 910 static const struct instruction_type_info inst_info[] = {
 911 #define DEFINE_INST(ENUM, STRUCT, EXTENSIBLE, NAME)    {OVSINST_##ENUM, NAME},
 912 OVS_INSTRUCTIONS
 913 #undef DEFINE_INST
 914 };
 915
 916 const char *
 917 ofpact_instruction_name_from_type(enum ovs_instruction_type type)
 918 {
 919     return inst_info[type].name;
 920 }
 921
 922 int
 923 ofpact_instruction_type_from_name(const char *name)
 924 {
 925     const struct instruction_type_info *p;
 926     for (p = inst_info; p < &inst_info[ARRAY_SIZE(inst_info)]; p++) {
 927         if (!strcasecmp(name, p->name)) {
 928             return p->type;
 929         }
 930     }
 931     return -1;
 932 }
 933
 934 static inline struct ofp11_instruction *
 935 instruction_next(const struct ofp11_instruction *inst)
 936 {
 937     return ((struct ofp11_instruction *) (void *)
 938             ((uint8_t *) inst + ntohs(inst->len)));
 939 }
 940
 941 static inline bool
 942 instruction_is_valid(const struct ofp11_instruction *inst,
 943                      size_t n_instructions)
 944 {
 945     uint16_t len = ntohs(inst->len);
 946     return (!(len % OFP11_INSTRUCTION_ALIGN)
 947             && len >= sizeof *inst
 948             && len / sizeof *inst <= n_instructions);
 949 }
 950
 951 /* This macro is careful to check for instructions with bad lengths. */
 952 #define INSTRUCTION_FOR_EACH(ITER, LEFT, INSTRUCTIONS, N_INSTRUCTIONS)  \
 953     for ((ITER) = (INSTRUCTIONS), (LEFT) = (N_INSTRUCTIONS);            \
 954          (LEFT) > 0 && instruction_is_valid(ITER, LEFT);                \
 955          ((LEFT) -= (ntohs((ITER)->len)                                 \
 956                      / sizeof(struct ofp11_instruction)),               \
 957           (ITER) = instruction_next(ITER)))
 958
 959 static enum ofperr
 960 decode_openflow11_instruction(const struct ofp11_instruction *inst,
 961                               enum ovs_instruction_type *type)
 962 {
 963     uint16_t len = ntohs(inst->len);
 964
 965     switch (inst->type) {
 966     case CONSTANT_HTONS(OFPIT11_EXPERIMENTER):
 967         return OFPERR_OFPBIC_BAD_EXPERIMENTER;
 968
 969 #define DEFINE_INST(ENUM, STRUCT, EXTENSIBLE, NAME)     \
 970         case CONSTANT_HTONS(ENUM):                      \
 971             if (EXTENSIBLE                              \
 972                 ? len >= sizeof(struct STRUCT)          \
 973                 : len == sizeof(struct STRUCT)) {       \
 974                 *type = OVSINST_##ENUM;                 \
 975                 return 0;                               \
 976             } else {                                    \
 977                 return OFPERR_OFPBIC_BAD_LEN;           \
 978             }
 979 OVS_INSTRUCTIONS
 980 #undef DEFINE_INST
 981
 982     default:
 983         return OFPERR_OFPBIC_UNKNOWN_INST;
 984     }
 985 }
 986
 987 static enum ofperr
 988 decode_openflow11_instructions(const struct ofp11_instruction insts[],
 989                                size_t n_insts,
 990                                const struct ofp11_instruction *out[])
 991 {
 992     const struct ofp11_instruction *inst;
 993     size_t left;
 994
 995     memset(out, 0, N_OVS_INSTRUCTIONS * sizeof *out);
 996     INSTRUCTION_FOR_EACH (inst, left, insts, n_insts) {
 997         enum ovs_instruction_type type;
 998         enum ofperr error;
 999
1000         error = decode_openflow11_instruction(inst, &type);
1001         if (error) {
1002             return error;
1003         }
1004
1005         if (out[type]) {
1006             return OFPERR_OFPBAC_UNSUPPORTED_ORDER; /* No specific code for
1007                                                      * a duplicate instruction
1008                                                      * exist */
1009         }
1010         out[type] = inst;
1011     }
1012
1013     if (left) {
1014         VLOG_WARN_RL(&rl, "bad instruction format at offset %zu",
1015                      (n_insts - left) * sizeof *inst);
1016         return OFPERR_OFPBIC_BAD_LEN;
1017     }
1018     return 0;
1019 }
1020
1021 static void
1022 get_actions_from_instruction(const struct ofp11_instruction *inst,
1023                          const union ofp_action **actions,
1024                          size_t *n_actions)
1025 {
1026     *actions = (const union ofp_action *) (inst + 1);
1027     *n_actions = (ntohs(inst->len) - sizeof *inst) / OFP11_INSTRUCTION_ALIGN;
1028 }
1029
1030 /* Attempts to convert 'actions_len' bytes of OpenFlow 1.1 actions from the
1031  * front of 'openflow' into ofpacts.  On success, replaces any existing content
1032  * in 'ofpacts' by the converted ofpacts; on failure, clears 'ofpacts'.
1033  * Returns 0 if successful, otherwise an OpenFlow error.
1034  *
1035  * In most places in OpenFlow 1.1 and 1.2, actions appear encapsulated in
1036  * instructions, so you should call ofpacts_pull_openflow11_instructions()
1037  * instead of this function.
1038  *
1039  * The parsed actions are valid generically, but they may not be valid in a
1040  * specific context.  For example, port numbers up to OFPP_MAX are valid
1041  * generically, but specific datapaths may only support port numbers in a
1042  * smaller range.  Use ofpacts_check() to additional check whether actions are
1043  * valid in a specific context. */
1044 enum ofperr
1045 ofpacts_pull_openflow11_actions(struct ofpbuf *openflow,
1046                                 unsigned int actions_len,
1047                                 struct ofpbuf *ofpacts)
1048 {
1049     return ofpacts_pull_actions(openflow, actions_len, ofpacts,
1050                                 ofpacts_from_openflow11);
1051 }
1052
1053 enum ofperr
1054 ofpacts_pull_openflow11_instructions(struct ofpbuf *openflow,
1055                                      unsigned int instructions_len,
1056                                      uint8_t table_id,
1057                                      struct ofpbuf *ofpacts)
1058 {
1059     static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(1, 5);
1060     const struct ofp11_instruction *instructions;
1061     const struct ofp11_instruction *insts[N_OVS_INSTRUCTIONS];
1062     enum ofperr error;
1063
1064     ofpbuf_clear(ofpacts);
1065
1066     if (instructions_len % OFP11_INSTRUCTION_ALIGN != 0) {
1067         VLOG_WARN_RL(&rl, "OpenFlow message instructions length %u is not a "
1068                      "multiple of %d",
1069                      instructions_len, OFP11_INSTRUCTION_ALIGN);
1070         error = OFPERR_OFPBIC_BAD_LEN;
1071         goto exit;
1072     }
1073
1074     instructions = ofpbuf_try_pull(openflow, instructions_len);
1075     if (instructions == NULL) {
1076         VLOG_WARN_RL(&rl, "OpenFlow message instructions length %u exceeds "
1077                      "remaining message length (%zu)",
1078                      instructions_len, openflow->size);
1079         error = OFPERR_OFPBIC_BAD_LEN;
1080         goto exit;
1081     }
1082
1083     error = decode_openflow11_instructions(
1084         instructions, instructions_len / OFP11_INSTRUCTION_ALIGN,
1085         insts);
1086     if (error) {
1087         goto exit;
1088     }
1089
1090     if (insts[OVSINST_OFPIT13_METER]) {
1091         const struct ofp13_instruction_meter *oim;
1092         struct ofpact_meter *om;
1093
1094         oim = (const struct ofp13_instruction_meter *)
1095             insts[OVSINST_OFPIT13_METER];
1096
1097         om = ofpact_put_METER(ofpacts);
1098         om->meter_id = ntohl(oim->meter_id);
1099     }
1100     if (insts[OVSINST_OFPIT11_APPLY_ACTIONS]) {
1101         const union ofp_action *actions;
1102         size_t n_actions;
1103
1104         get_actions_from_instruction(insts[OVSINST_OFPIT11_APPLY_ACTIONS],
1105                                      &actions, &n_actions);
1106         error = ofpacts_from_openflow11(actions, n_actions, ofpacts);
1107         if (error) {
1108             goto exit;
1109         }
1110     }
1111     if (insts[OVSINST_OFPIT11_CLEAR_ACTIONS]) {
1112         instruction_get_OFPIT11_CLEAR_ACTIONS(
1113             insts[OVSINST_OFPIT11_CLEAR_ACTIONS]);
1114         ofpact_put_CLEAR_ACTIONS(ofpacts);
1115     }
1116     /* XXX Write-Actions */
1117     if (insts[OVSINST_OFPIT11_WRITE_METADATA]) {
1118         const struct ofp11_instruction_write_metadata *oiwm;
1119         struct ofpact_metadata *om;
1120
1121         oiwm = (const struct ofp11_instruction_write_metadata *)
1122             insts[OVSINST_OFPIT11_WRITE_METADATA];
1123
1124         om = ofpact_put_WRITE_METADATA(ofpacts);
1125         om->metadata = oiwm->metadata;
1126         om->mask = oiwm->metadata_mask;
1127     }
1128     if (insts[OVSINST_OFPIT11_GOTO_TABLE]) {
1129         const struct ofp11_instruction_goto_table *oigt;
1130         struct ofpact_goto_table *ogt;
1131
1132         oigt = instruction_get_OFPIT11_GOTO_TABLE(
1133             insts[OVSINST_OFPIT11_GOTO_TABLE]);
1134         if (table_id >= oigt->table_id) {
1135             error = OFPERR_OFPBRC_BAD_TABLE_ID;
1136             goto exit;
1137         }
1138         ogt = ofpact_put_GOTO_TABLE(ofpacts);
1139         ogt->table_id = oigt->table_id;
1140     }
1141
1142     if (insts[OVSINST_OFPIT11_WRITE_ACTIONS]) {
1143         error = OFPERR_OFPBIC_UNSUP_INST;
1144         goto exit;
1145     }
1146
1147     error = ofpacts_verify(ofpacts->data, ofpacts->size);
1148 exit:
1149     if (error) {
1150         ofpbuf_clear(ofpacts);
1151     }
1152     return error;
1153 }
1154 \f
1155 /* May modify flow->dl_type, caller must restore it. */
1156 static enum ofperr
1157 ofpact_check__(const struct ofpact *a, struct flow *flow, ofp_port_t max_ports)
1158 {
1159     const struct ofpact_enqueue *enqueue;
1160
1161     switch (a->type) {
1162     case OFPACT_OUTPUT:
1163         return ofputil_check_output_port(ofpact_get_OUTPUT(a)->port,
1164                                          max_ports);
1165
1166     case OFPACT_CONTROLLER:
1167         return 0;
1168
1169     case OFPACT_ENQUEUE:
1170         enqueue = ofpact_get_ENQUEUE(a);
1171         if (ofp_to_u16(enqueue->port) >= ofp_to_u16(max_ports)
1172             && enqueue->port != OFPP_IN_PORT
1173             && enqueue->port != OFPP_LOCAL) {
1174             return OFPERR_OFPBAC_BAD_OUT_PORT;
1175         }
1176         return 0;
1177
1178     case OFPACT_OUTPUT_REG:
1179         return mf_check_src(&ofpact_get_OUTPUT_REG(a)->src, flow);
1180
1181     case OFPACT_BUNDLE:
1182         return bundle_check(ofpact_get_BUNDLE(a), max_ports, flow);
1183
1184     case OFPACT_SET_VLAN_VID:
1185     case OFPACT_SET_VLAN_PCP:
1186     case OFPACT_STRIP_VLAN:
1187     case OFPACT_PUSH_VLAN:
1188     case OFPACT_SET_ETH_SRC:
1189     case OFPACT_SET_ETH_DST:
1190     case OFPACT_SET_IPV4_SRC:
1191     case OFPACT_SET_IPV4_DST:
1192     case OFPACT_SET_IPV4_DSCP:
1193     case OFPACT_SET_L4_SRC_PORT:
1194     case OFPACT_SET_L4_DST_PORT:
1195         return 0;
1196
1197     case OFPACT_REG_MOVE:
1198         return nxm_reg_move_check(ofpact_get_REG_MOVE(a), flow);
1199
1200     case OFPACT_REG_LOAD:
1201         return nxm_reg_load_check(ofpact_get_REG_LOAD(a), flow);
1202
1203     case OFPACT_STACK_PUSH:
1204         return nxm_stack_push_check(ofpact_get_STACK_PUSH(a), flow);
1205
1206     case OFPACT_STACK_POP:
1207         return nxm_stack_pop_check(ofpact_get_STACK_POP(a), flow);
1208
1209     case OFPACT_DEC_TTL:
1210     case OFPACT_SET_MPLS_TTL:
1211     case OFPACT_DEC_MPLS_TTL:
1212     case OFPACT_SET_TUNNEL:
1213     case OFPACT_SET_QUEUE:
1214     case OFPACT_POP_QUEUE:
1215     case OFPACT_FIN_TIMEOUT:
1216     case OFPACT_RESUBMIT:
1217         return 0;
1218
1219     case OFPACT_LEARN:
1220         return learn_check(ofpact_get_LEARN(a), flow);
1221
1222     case OFPACT_MULTIPATH:
1223         return multipath_check(ofpact_get_MULTIPATH(a), flow);
1224
1225     case OFPACT_NOTE:
1226     case OFPACT_EXIT:
1227         return 0;
1228
1229     case OFPACT_PUSH_MPLS:
1230         flow->dl_type = ofpact_get_PUSH_MPLS(a)->ethertype;
1231         return 0;
1232
1233     case OFPACT_POP_MPLS:
1234         flow->dl_type = ofpact_get_POP_MPLS(a)->ethertype;
1235         return 0;
1236
1237     case OFPACT_SAMPLE:
1238         return 0;
1239
1240     case OFPACT_CLEAR_ACTIONS:
1241     case OFPACT_WRITE_METADATA:
1242     case OFPACT_METER:
1243     case OFPACT_GOTO_TABLE:
1244         return 0;
1245
1246     default:
1247         NOT_REACHED();
1248     }
1249 }
1250
1251 /* Checks that the 'ofpacts_len' bytes of actions in 'ofpacts' are
1252  * appropriate for a packet with the prerequisites satisfied by 'flow' in a
1253  * switch with no more than 'max_ports' ports.
1254  *
1255  * May temporarily modify 'flow', but restores the changes before returning. */
1256 enum ofperr
1257 ofpacts_check(const struct ofpact ofpacts[], size_t ofpacts_len,
1258               struct flow *flow, ofp_port_t max_ports)
1259 {
1260     const struct ofpact *a;
1261     ovs_be16 dl_type = flow->dl_type;
1262     enum ofperr error = 0;
1263
1264     OFPACT_FOR_EACH (a, ofpacts, ofpacts_len) {
1265         error = ofpact_check__(a, flow, max_ports);
1266         if (error) {
1267             break;
1268         }
1269     }
1270     flow->dl_type = dl_type; /* Restore. */
1271     return error;
1272 }
1273
1274 /* Verifies that the 'ofpacts_len' bytes of actions in 'ofpacts' are
1275  * in the appropriate order as defined by the OpenFlow spec. */
1276 enum ofperr
1277 ofpacts_verify(const struct ofpact ofpacts[], size_t ofpacts_len)
1278 {
1279     const struct ofpact *a;
1280     enum ovs_instruction_type inst;
1281
1282     inst = OVSINST_OFPIT11_APPLY_ACTIONS;
1283     OFPACT_FOR_EACH (a, ofpacts, ofpacts_len) {
1284         enum ovs_instruction_type next;
1285
1286         if (a->type == OFPACT_METER) {
1287             next = OVSINST_OFPIT13_METER;
1288         } else if (a->type == OFPACT_CLEAR_ACTIONS) {
1289             next = OVSINST_OFPIT11_CLEAR_ACTIONS;
1290         } else if (a->type == OFPACT_WRITE_METADATA) {
1291             next = OVSINST_OFPIT11_WRITE_METADATA;
1292         } else if (a->type == OFPACT_GOTO_TABLE) {
1293             next = OVSINST_OFPIT11_GOTO_TABLE;
1294         } else {
1295             next = OVSINST_OFPIT11_APPLY_ACTIONS;
1296         }
1297
1298         if (inst != OVSINST_OFPIT11_APPLY_ACTIONS && next <= inst) {
1299             const char *name = ofpact_instruction_name_from_type(inst);
1300             const char *next_name = ofpact_instruction_name_from_type(next);
1301
1302             if (next == inst) {
1303                 VLOG_WARN("duplicate %s instruction not allowed, for OpenFlow "
1304                           "1.1+ compatibility", name);
1305             } else {
1306                 VLOG_WARN("invalid instruction ordering: %s must appear "
1307                           "before %s, for OpenFlow 1.1+ compatibility",
1308                           next_name, name);
1309             }
1310             return OFPERR_OFPBAC_UNSUPPORTED_ORDER;
1311         }
1312
1313         inst = next;
1314     }
1315
1316     return 0;
1317 }
1318 \f
1319 /* Converting ofpacts to Nicira OpenFlow extensions. */
1320
1321 static void
1322 ofpact_output_reg_to_nxast(const struct ofpact_output_reg *output_reg,
1323                                 struct ofpbuf *out)
1324 {
1325     struct nx_action_output_reg *naor = ofputil_put_NXAST_OUTPUT_REG(out);
1326
1327     naor->ofs_nbits = nxm_encode_ofs_nbits(output_reg->src.ofs,
1328                                            output_reg->src.n_bits);
1329     naor->src = htonl(output_reg->src.field->nxm_header);
1330     naor->max_len = htons(output_reg->max_len);
1331 }
1332
1333 static void
1334 ofpact_resubmit_to_nxast(const struct ofpact_resubmit *resubmit,
1335                          struct ofpbuf *out)
1336 {
1337     struct nx_action_resubmit *nar;
1338
1339     if (resubmit->table_id == 0xff
1340         && resubmit->ofpact.compat != OFPUTIL_NXAST_RESUBMIT_TABLE) {
1341         nar = ofputil_put_NXAST_RESUBMIT(out);
1342     } else {
1343         nar = ofputil_put_NXAST_RESUBMIT_TABLE(out);
1344         nar->table = resubmit->table_id;
1345     }
1346     nar->in_port = htons(ofp_to_u16(resubmit->in_port));
1347 }
1348
1349 static void
1350 ofpact_set_tunnel_to_nxast(const struct ofpact_tunnel *tunnel,
1351                            struct ofpbuf *out)
1352 {
1353     uint64_t tun_id = tunnel->tun_id;
1354
1355     if (tun_id <= UINT32_MAX
1356         && tunnel->ofpact.compat != OFPUTIL_NXAST_SET_TUNNEL64) {
1357         ofputil_put_NXAST_SET_TUNNEL(out)->tun_id = htonl(tun_id);
1358     } else {
1359         ofputil_put_NXAST_SET_TUNNEL64(out)->tun_id = htonll(tun_id);
1360     }
1361 }
1362
1363 static void
1364 ofpact_write_metadata_to_nxast(const struct ofpact_metadata *om,
1365                                struct ofpbuf *out)
1366 {
1367     struct nx_action_write_metadata *nawm;
1368
1369     nawm = ofputil_put_NXAST_WRITE_METADATA(out);
1370     nawm->metadata = om->metadata;
1371     nawm->mask = om->mask;
1372 }
1373
1374 static void
1375 ofpact_note_to_nxast(const struct ofpact_note *note, struct ofpbuf *out)
1376 {
1377     size_t start_ofs = out->size;
1378     struct nx_action_note *nan;
1379     unsigned int remainder;
1380     unsigned int len;
1381
1382     nan = ofputil_put_NXAST_NOTE(out);
1383     out->size -= sizeof nan->note;
1384
1385     ofpbuf_put(out, note->data, note->length);
1386
1387     len = out->size - start_ofs;
1388     remainder = len % OFP_ACTION_ALIGN;
1389     if (remainder) {
1390         ofpbuf_put_zeros(out, OFP_ACTION_ALIGN - remainder);
1391     }
1392     nan = (struct nx_action_note *)((char *)out->data + start_ofs);
1393     nan->len = htons(out->size - start_ofs);
1394 }
1395
1396 static void
1397 ofpact_controller_to_nxast(const struct ofpact_controller *oc,
1398                            struct ofpbuf *out)
1399 {
1400     struct nx_action_controller *nac;
1401
1402     nac = ofputil_put_NXAST_CONTROLLER(out);
1403     nac->max_len = htons(oc->max_len);
1404     nac->controller_id = htons(oc->controller_id);
1405     nac->reason = oc->reason;
1406 }
1407
1408 static void
1409 ofpact_dec_ttl_to_nxast(const struct ofpact_cnt_ids *oc_ids,
1410                         struct ofpbuf *out)
1411 {
1412     if (oc_ids->ofpact.compat == OFPUTIL_NXAST_DEC_TTL) {
1413         ofputil_put_NXAST_DEC_TTL(out);
1414     } else {
1415         struct nx_action_cnt_ids *nac_ids =
1416             ofputil_put_NXAST_DEC_TTL_CNT_IDS(out);
1417         int ids_len = ROUND_UP(2 * oc_ids->n_controllers, OFP_ACTION_ALIGN);
1418         ovs_be16 *ids;
1419         size_t i;
1420
1421         nac_ids->len = htons(ntohs(nac_ids->len) + ids_len);
1422         nac_ids->n_controllers = htons(oc_ids->n_controllers);
1423
1424         ids = ofpbuf_put_zeros(out, ids_len);
1425         for (i = 0; i < oc_ids->n_controllers; i++) {
1426             ids[i] = htons(oc_ids->cnt_ids[i]);
1427         }
1428     }
1429 }
1430
1431 static void
1432 ofpact_fin_timeout_to_nxast(const struct ofpact_fin_timeout *fin_timeout,
1433                             struct ofpbuf *out)
1434 {
1435     struct nx_action_fin_timeout *naft = ofputil_put_NXAST_FIN_TIMEOUT(out);
1436     naft->fin_idle_timeout = htons(fin_timeout->fin_idle_timeout);
1437     naft->fin_hard_timeout = htons(fin_timeout->fin_hard_timeout);
1438 }
1439
1440 static void
1441 ofpact_sample_to_nxast(const struct ofpact_sample *os,
1442                        struct ofpbuf *out)
1443 {
1444     struct nx_action_sample *nas;
1445
1446     nas = ofputil_put_NXAST_SAMPLE(out);
1447     nas->probability = htons(os->probability);
1448     nas->collector_set_id = htonl(os->collector_set_id);
1449     nas->obs_domain_id = htonl(os->obs_domain_id);
1450     nas->obs_point_id = htonl(os->obs_point_id);
1451 }
1452
1453 static void
1454 ofpact_to_nxast(const struct ofpact *a, struct ofpbuf *out)
1455 {
1456     switch (a->type) {
1457     case OFPACT_CONTROLLER:
1458         ofpact_controller_to_nxast(ofpact_get_CONTROLLER(a), out);
1459         break;
1460
1461     case OFPACT_OUTPUT_REG:
1462         ofpact_output_reg_to_nxast(ofpact_get_OUTPUT_REG(a), out);
1463         break;
1464
1465     case OFPACT_BUNDLE:
1466         bundle_to_nxast(ofpact_get_BUNDLE(a), out);
1467         break;
1468
1469     case OFPACT_REG_MOVE:
1470         nxm_reg_move_to_nxast(ofpact_get_REG_MOVE(a), out);
1471         break;
1472
1473     case OFPACT_REG_LOAD:
1474         nxm_reg_load_to_nxast(ofpact_get_REG_LOAD(a), out);
1475         break;
1476
1477     case OFPACT_STACK_PUSH:
1478         nxm_stack_push_to_nxast(ofpact_get_STACK_PUSH(a), out);
1479         break;
1480
1481     case OFPACT_STACK_POP:
1482         nxm_stack_pop_to_nxast(ofpact_get_STACK_POP(a), out);
1483         break;
1484
1485     case OFPACT_DEC_TTL:
1486         ofpact_dec_ttl_to_nxast(ofpact_get_DEC_TTL(a), out);
1487         break;
1488
1489     case OFPACT_SET_MPLS_TTL:
1490         ofputil_put_NXAST_SET_MPLS_TTL(out)->ttl
1491             = ofpact_get_SET_MPLS_TTL(a)->ttl;
1492         break;
1493
1494     case OFPACT_DEC_MPLS_TTL:
1495         ofputil_put_NXAST_DEC_MPLS_TTL(out);
1496         break;
1497
1498     case OFPACT_SET_TUNNEL:
1499         ofpact_set_tunnel_to_nxast(ofpact_get_SET_TUNNEL(a), out);
1500         break;
1501
1502     case OFPACT_WRITE_METADATA:
1503         ofpact_write_metadata_to_nxast(ofpact_get_WRITE_METADATA(a), out);
1504         break;
1505
1506     case OFPACT_SET_QUEUE:
1507         ofputil_put_NXAST_SET_QUEUE(out)->queue_id
1508             = htonl(ofpact_get_SET_QUEUE(a)->queue_id);
1509         break;
1510
1511     case OFPACT_POP_QUEUE:
1512         ofputil_put_NXAST_POP_QUEUE(out);
1513         break;
1514
1515     case OFPACT_FIN_TIMEOUT:
1516         ofpact_fin_timeout_to_nxast(ofpact_get_FIN_TIMEOUT(a), out);
1517         break;
1518
1519     case OFPACT_RESUBMIT:
1520         ofpact_resubmit_to_nxast(ofpact_get_RESUBMIT(a), out);
1521         break;
1522
1523     case OFPACT_LEARN:
1524         learn_to_nxast(ofpact_get_LEARN(a), out);
1525         break;
1526
1527     case OFPACT_MULTIPATH:
1528         multipath_to_nxast(ofpact_get_MULTIPATH(a), out);
1529         break;
1530
1531     case OFPACT_NOTE:
1532         ofpact_note_to_nxast(ofpact_get_NOTE(a), out);
1533         break;
1534
1535     case OFPACT_EXIT:
1536         ofputil_put_NXAST_EXIT(out);
1537         break;
1538
1539     case OFPACT_PUSH_MPLS:
1540         ofputil_put_NXAST_PUSH_MPLS(out)->ethertype =
1541             ofpact_get_PUSH_MPLS(a)->ethertype;
1542         break;
1543
1544     case OFPACT_POP_MPLS:
1545         ofputil_put_NXAST_POP_MPLS(out)->ethertype =
1546             ofpact_get_POP_MPLS(a)->ethertype;
1547         break;
1548
1549     case OFPACT_SAMPLE:
1550         ofpact_sample_to_nxast(ofpact_get_SAMPLE(a), out);
1551         break;
1552
1553     case OFPACT_OUTPUT:
1554     case OFPACT_ENQUEUE:
1555     case OFPACT_SET_VLAN_VID:
1556     case OFPACT_SET_VLAN_PCP:
1557     case OFPACT_STRIP_VLAN:
1558     case OFPACT_PUSH_VLAN:
1559     case OFPACT_SET_ETH_SRC:
1560     case OFPACT_SET_ETH_DST:
1561     case OFPACT_SET_IPV4_SRC:
1562     case OFPACT_SET_IPV4_DST:
1563     case OFPACT_SET_IPV4_DSCP:
1564     case OFPACT_SET_L4_SRC_PORT:
1565     case OFPACT_SET_L4_DST_PORT:
1566     case OFPACT_CLEAR_ACTIONS:
1567     case OFPACT_GOTO_TABLE:
1568     case OFPACT_METER:
1569         NOT_REACHED();
1570     }
1571 }
1572 \f
1573 /* Converting ofpacts to OpenFlow 1.0. */
1574
1575 static void
1576 ofpact_output_to_openflow10(const struct ofpact_output *output,
1577                             struct ofpbuf *out)
1578 {
1579     struct ofp10_action_output *oao;
1580
1581     oao = ofputil_put_OFPAT10_OUTPUT(out);
1582     oao->port = htons(ofp_to_u16(output->port));
1583     oao->max_len = htons(output->max_len);
1584 }
1585
1586 static void
1587 ofpact_enqueue_to_openflow10(const struct ofpact_enqueue *enqueue,
1588                              struct ofpbuf *out)
1589 {
1590     struct ofp10_action_enqueue *oae;
1591
1592     oae = ofputil_put_OFPAT10_ENQUEUE(out);
1593     oae->port = htons(ofp_to_u16(enqueue->port));
1594     oae->queue_id = htonl(enqueue->queue);
1595 }
1596
1597 static void
1598 ofpact_to_openflow10(const struct ofpact *a, struct ofpbuf *out)
1599 {
1600     switch (a->type) {
1601     case OFPACT_OUTPUT:
1602         ofpact_output_to_openflow10(ofpact_get_OUTPUT(a), out);
1603         break;
1604
1605     case OFPACT_ENQUEUE:
1606         ofpact_enqueue_to_openflow10(ofpact_get_ENQUEUE(a), out);
1607         break;
1608
1609     case OFPACT_SET_VLAN_VID:
1610         ofputil_put_OFPAT10_SET_VLAN_VID(out)->vlan_vid
1611             = htons(ofpact_get_SET_VLAN_VID(a)->vlan_vid);
1612         break;
1613
1614     case OFPACT_SET_VLAN_PCP:
1615         ofputil_put_OFPAT10_SET_VLAN_PCP(out)->vlan_pcp
1616             = ofpact_get_SET_VLAN_PCP(a)->vlan_pcp;
1617         break;
1618
1619     case OFPACT_STRIP_VLAN:
1620         ofputil_put_OFPAT10_STRIP_VLAN(out);
1621         break;
1622
1623     case OFPACT_SET_ETH_SRC:
1624         memcpy(ofputil_put_OFPAT10_SET_DL_SRC(out)->dl_addr,
1625                ofpact_get_SET_ETH_SRC(a)->mac, ETH_ADDR_LEN);
1626         break;
1627
1628     case OFPACT_SET_ETH_DST:
1629         memcpy(ofputil_put_OFPAT10_SET_DL_DST(out)->dl_addr,
1630                ofpact_get_SET_ETH_DST(a)->mac, ETH_ADDR_LEN);
1631         break;
1632
1633     case OFPACT_SET_IPV4_SRC:
1634         ofputil_put_OFPAT10_SET_NW_SRC(out)->nw_addr
1635             = ofpact_get_SET_IPV4_SRC(a)->ipv4;
1636         break;
1637
1638     case OFPACT_SET_IPV4_DST:
1639         ofputil_put_OFPAT10_SET_NW_DST(out)->nw_addr
1640             = ofpact_get_SET_IPV4_DST(a)->ipv4;
1641         break;
1642
1643     case OFPACT_SET_IPV4_DSCP:
1644         ofputil_put_OFPAT10_SET_NW_TOS(out)->nw_tos
1645             = ofpact_get_SET_IPV4_DSCP(a)->dscp;
1646         break;
1647
1648     case OFPACT_SET_L4_SRC_PORT:
1649         ofputil_put_OFPAT10_SET_TP_SRC(out)->tp_port
1650             = htons(ofpact_get_SET_L4_SRC_PORT(a)->port);
1651         break;
1652
1653     case OFPACT_SET_L4_DST_PORT:
1654         ofputil_put_OFPAT10_SET_TP_DST(out)->tp_port
1655             = htons(ofpact_get_SET_L4_DST_PORT(a)->port);
1656         break;
1657
1658     case OFPACT_PUSH_VLAN:
1659     case OFPACT_CLEAR_ACTIONS:
1660     case OFPACT_GOTO_TABLE:
1661     case OFPACT_METER:
1662         /* XXX */
1663         break;
1664
1665     case OFPACT_CONTROLLER:
1666     case OFPACT_OUTPUT_REG:
1667     case OFPACT_BUNDLE:
1668     case OFPACT_REG_MOVE:
1669     case OFPACT_REG_LOAD:
1670     case OFPACT_STACK_PUSH:
1671     case OFPACT_STACK_POP:
1672     case OFPACT_DEC_TTL:
1673     case OFPACT_SET_MPLS_TTL:
1674     case OFPACT_DEC_MPLS_TTL:
1675     case OFPACT_SET_TUNNEL:
1676     case OFPACT_WRITE_METADATA:
1677     case OFPACT_SET_QUEUE:
1678     case OFPACT_POP_QUEUE:
1679     case OFPACT_FIN_TIMEOUT:
1680     case OFPACT_RESUBMIT:
1681     case OFPACT_LEARN:
1682     case OFPACT_MULTIPATH:
1683     case OFPACT_NOTE:
1684     case OFPACT_EXIT:
1685     case OFPACT_PUSH_MPLS:
1686     case OFPACT_POP_MPLS:
1687     case OFPACT_SAMPLE:
1688         ofpact_to_nxast(a, out);
1689         break;
1690     }
1691 }
1692
1693 /* Converts the 'ofpacts_len' bytes of ofpacts in 'ofpacts' into OpenFlow 1.0
1694  * actions in 'openflow', appending the actions to any existing data in
1695  * 'openflow'. */
1696 void
1697 ofpacts_put_openflow10(const struct ofpact ofpacts[], size_t ofpacts_len,
1698                        struct ofpbuf *openflow)
1699 {
1700     const struct ofpact *a;
1701
1702     OFPACT_FOR_EACH (a, ofpacts, ofpacts_len) {
1703         ofpact_to_openflow10(a, openflow);
1704     }
1705 }
1706 \f
1707 /* Converting ofpacts to OpenFlow 1.1. */
1708
1709 static void
1710 ofpact_output_to_openflow11(const struct ofpact_output *output,
1711                             struct ofpbuf *out)
1712 {
1713     struct ofp11_action_output *oao;
1714
1715     oao = ofputil_put_OFPAT11_OUTPUT(out);
1716     oao->port = ofputil_port_to_ofp11(output->port);
1717     oao->max_len = htons(output->max_len);
1718 }
1719
1720 static void
1721 ofpact_dec_ttl_to_openflow11(const struct ofpact_cnt_ids *dec_ttl,
1722                              struct ofpbuf *out)
1723 {
1724     if (dec_ttl->n_controllers == 1 && dec_ttl->cnt_ids[0] == 0
1725         && (!dec_ttl->ofpact.compat ||
1726             dec_ttl->ofpact.compat == OFPUTIL_OFPAT11_DEC_NW_TTL)) {
1727         ofputil_put_OFPAT11_DEC_NW_TTL(out);
1728     } else {
1729         ofpact_dec_ttl_to_nxast(dec_ttl, out);
1730     }
1731 }
1732
1733 static void
1734 ofpact_to_openflow11(const struct ofpact *a, struct ofpbuf *out)
1735 {
1736     switch (a->type) {
1737     case OFPACT_OUTPUT:
1738         return ofpact_output_to_openflow11(ofpact_get_OUTPUT(a), out);
1739
1740     case OFPACT_ENQUEUE:
1741         /* XXX */
1742         break;
1743
1744     case OFPACT_SET_VLAN_VID:
1745         ofputil_put_OFPAT11_SET_VLAN_VID(out)->vlan_vid
1746             = htons(ofpact_get_SET_VLAN_VID(a)->vlan_vid);
1747         break;
1748
1749     case OFPACT_SET_VLAN_PCP:
1750         ofputil_put_OFPAT11_SET_VLAN_PCP(out)->vlan_pcp
1751             = ofpact_get_SET_VLAN_PCP(a)->vlan_pcp;
1752         break;
1753
1754     case OFPACT_STRIP_VLAN:
1755         ofputil_put_OFPAT11_POP_VLAN(out);
1756         break;
1757
1758     case OFPACT_PUSH_VLAN:
1759         /* XXX ETH_TYPE_VLAN_8021AD case */
1760         ofputil_put_OFPAT11_PUSH_VLAN(out)->ethertype =
1761             htons(ETH_TYPE_VLAN_8021Q);
1762         break;
1763
1764     case OFPACT_SET_QUEUE:
1765         ofputil_put_OFPAT11_SET_QUEUE(out)->queue_id
1766             = htonl(ofpact_get_SET_QUEUE(a)->queue_id);
1767         break;
1768
1769     case OFPACT_SET_ETH_SRC:
1770         memcpy(ofputil_put_OFPAT11_SET_DL_SRC(out)->dl_addr,
1771                ofpact_get_SET_ETH_SRC(a)->mac, ETH_ADDR_LEN);
1772         break;
1773
1774     case OFPACT_SET_ETH_DST:
1775         memcpy(ofputil_put_OFPAT11_SET_DL_DST(out)->dl_addr,
1776                ofpact_get_SET_ETH_DST(a)->mac, ETH_ADDR_LEN);
1777         break;
1778
1779     case OFPACT_SET_IPV4_SRC:
1780         ofputil_put_OFPAT11_SET_NW_SRC(out)->nw_addr
1781             = ofpact_get_SET_IPV4_SRC(a)->ipv4;
1782         break;
1783
1784     case OFPACT_SET_IPV4_DST:
1785         ofputil_put_OFPAT11_SET_NW_DST(out)->nw_addr
1786             = ofpact_get_SET_IPV4_DST(a)->ipv4;
1787         break;
1788
1789     case OFPACT_SET_IPV4_DSCP:
1790         ofputil_put_OFPAT11_SET_NW_TOS(out)->nw_tos
1791             = ofpact_get_SET_IPV4_DSCP(a)->dscp;
1792         break;
1793
1794     case OFPACT_SET_L4_SRC_PORT:
1795         ofputil_put_OFPAT11_SET_TP_SRC(out)->tp_port
1796             = htons(ofpact_get_SET_L4_SRC_PORT(a)->port);
1797         break;
1798
1799     case OFPACT_SET_L4_DST_PORT:
1800         ofputil_put_OFPAT11_SET_TP_DST(out)->tp_port
1801             = htons(ofpact_get_SET_L4_DST_PORT(a)->port);
1802         break;
1803
1804     case OFPACT_DEC_TTL:
1805         ofpact_dec_ttl_to_openflow11(ofpact_get_DEC_TTL(a), out);
1806         break;
1807
1808     case OFPACT_SET_MPLS_TTL:
1809         ofputil_put_OFPAT11_SET_MPLS_TTL(out)->mpls_ttl
1810             = ofpact_get_SET_MPLS_TTL(a)->ttl;
1811         break;
1812
1813     case OFPACT_DEC_MPLS_TTL:
1814         ofputil_put_OFPAT11_DEC_MPLS_TTL(out);
1815         break;
1816
1817     case OFPACT_WRITE_METADATA:
1818         /* OpenFlow 1.1 uses OFPIT_WRITE_METADATA to express this action. */
1819         break;
1820
1821     case OFPACT_PUSH_MPLS:
1822         ofputil_put_OFPAT11_PUSH_MPLS(out)->ethertype =
1823             ofpact_get_PUSH_MPLS(a)->ethertype;
1824         break;
1825
1826     case OFPACT_POP_MPLS:
1827         ofputil_put_OFPAT11_POP_MPLS(out)->ethertype =
1828             ofpact_get_POP_MPLS(a)->ethertype;
1829
1830         break;
1831
1832     case OFPACT_CLEAR_ACTIONS:
1833     case OFPACT_GOTO_TABLE:
1834     case OFPACT_METER:
1835         NOT_REACHED();
1836
1837     case OFPACT_CONTROLLER:
1838     case OFPACT_OUTPUT_REG:
1839     case OFPACT_BUNDLE:
1840     case OFPACT_REG_MOVE:
1841     case OFPACT_REG_LOAD:
1842     case OFPACT_STACK_PUSH:
1843     case OFPACT_STACK_POP:
1844     case OFPACT_SET_TUNNEL:
1845     case OFPACT_POP_QUEUE:
1846     case OFPACT_FIN_TIMEOUT:
1847     case OFPACT_RESUBMIT:
1848     case OFPACT_LEARN:
1849     case OFPACT_MULTIPATH:
1850     case OFPACT_NOTE:
1851     case OFPACT_EXIT:
1852     case OFPACT_SAMPLE:
1853         ofpact_to_nxast(a, out);
1854         break;
1855     }
1856 }
1857
1858 /* Converts the ofpacts in 'ofpacts' (terminated by OFPACT_END) into OpenFlow
1859  * 1.1 actions in 'openflow', appending the actions to any existing data in
1860  * 'openflow'. */
1861 size_t
1862 ofpacts_put_openflow11_actions(const struct ofpact ofpacts[],
1863                                size_t ofpacts_len, struct ofpbuf *openflow)
1864 {
1865     const struct ofpact *a;
1866     size_t start_size = openflow->size;
1867
1868     OFPACT_FOR_EACH (a, ofpacts, ofpacts_len) {
1869         ofpact_to_openflow11(a, openflow);
1870     }
1871
1872     return openflow->size - start_size;
1873 }
1874
1875 static void
1876 ofpacts_update_instruction_actions(struct ofpbuf *openflow, size_t ofs)
1877 {
1878     struct ofp11_instruction_actions *oia;
1879
1880     /* Update the instruction's length (or, if it's empty, delete it). */
1881     oia = ofpbuf_at_assert(openflow, ofs, sizeof *oia);
1882     if (openflow->size > ofs + sizeof *oia) {
1883         oia->len = htons(openflow->size - ofs);
1884     } else {
1885         openflow->size = ofs;
1886     }
1887 }
1888
1889 void
1890 ofpacts_put_openflow11_instructions(const struct ofpact ofpacts[],
1891                                     size_t ofpacts_len,
1892                                     struct ofpbuf *openflow)
1893 {
1894     const struct ofpact *a;
1895
1896     OFPACT_FOR_EACH (a, ofpacts, ofpacts_len) {
1897         /* XXX Write-Actions */
1898
1899         if (a->type == OFPACT_CLEAR_ACTIONS) {
1900             instruction_put_OFPIT11_CLEAR_ACTIONS(openflow);
1901         } else if (a->type == OFPACT_GOTO_TABLE) {
1902             struct ofp11_instruction_goto_table *oigt;
1903
1904             oigt = instruction_put_OFPIT11_GOTO_TABLE(openflow);
1905             oigt->table_id = ofpact_get_GOTO_TABLE(a)->table_id;
1906             memset(oigt->pad, 0, sizeof oigt->pad);
1907         } else if (a->type == OFPACT_WRITE_METADATA) {
1908             const struct ofpact_metadata *om;
1909             struct ofp11_instruction_write_metadata *oiwm;
1910
1911             om = ofpact_get_WRITE_METADATA(a);
1912             oiwm = instruction_put_OFPIT11_WRITE_METADATA(openflow);
1913             oiwm->metadata = om->metadata;
1914             oiwm->metadata_mask = om->mask;
1915         } else if (a->type == OFPACT_METER) {
1916             const struct ofpact_meter *om;
1917             struct ofp13_instruction_meter *oim;
1918
1919             om = ofpact_get_METER(a);
1920             oim = instruction_put_OFPIT13_METER(openflow);
1921             oim->meter_id = htonl(om->meter_id);
1922         } else if (!ofpact_is_instruction(a)) {
1923             /* Apply-actions */
1924             const size_t ofs = openflow->size;
1925             const size_t ofpacts_len_left =
1926                 (uint8_t*)ofpact_end(ofpacts, ofpacts_len) - (uint8_t*)a;
1927             const struct ofpact *action;
1928             const struct ofpact *processed = a;
1929
1930             instruction_put_OFPIT11_APPLY_ACTIONS(openflow);
1931             OFPACT_FOR_EACH(action, a, ofpacts_len_left) {
1932                 if (ofpact_is_instruction(action)) {
1933                     break;
1934                 }
1935                 ofpact_to_openflow11(action, openflow);
1936                 processed = action;
1937             }
1938             ofpacts_update_instruction_actions(openflow, ofs);
1939             a = processed;
1940         }
1941     }
1942 }
1943 \f
1944 /* Returns true if 'action' outputs to 'port', false otherwise. */
1945 static bool
1946 ofpact_outputs_to_port(const struct ofpact *ofpact, ofp_port_t port)
1947 {
1948     switch (ofpact->type) {
1949     case OFPACT_OUTPUT:
1950         return ofpact_get_OUTPUT(ofpact)->port == port;
1951     case OFPACT_ENQUEUE:
1952         return ofpact_get_ENQUEUE(ofpact)->port == port;
1953     case OFPACT_CONTROLLER:
1954         return port == OFPP_CONTROLLER;
1955
1956     case OFPACT_OUTPUT_REG:
1957     case OFPACT_BUNDLE:
1958     case OFPACT_SET_VLAN_VID:
1959     case OFPACT_SET_VLAN_PCP:
1960     case OFPACT_STRIP_VLAN:
1961     case OFPACT_PUSH_VLAN:
1962     case OFPACT_SET_ETH_SRC:
1963     case OFPACT_SET_ETH_DST:
1964     case OFPACT_SET_IPV4_SRC:
1965     case OFPACT_SET_IPV4_DST:
1966     case OFPACT_SET_IPV4_DSCP:
1967     case OFPACT_SET_L4_SRC_PORT:
1968     case OFPACT_SET_L4_DST_PORT:
1969     case OFPACT_REG_MOVE:
1970     case OFPACT_REG_LOAD:
1971     case OFPACT_STACK_PUSH:
1972     case OFPACT_STACK_POP:
1973     case OFPACT_DEC_TTL:
1974     case OFPACT_SET_MPLS_TTL:
1975     case OFPACT_DEC_MPLS_TTL:
1976     case OFPACT_SET_TUNNEL:
1977     case OFPACT_WRITE_METADATA:
1978     case OFPACT_SET_QUEUE:
1979     case OFPACT_POP_QUEUE:
1980     case OFPACT_FIN_TIMEOUT:
1981     case OFPACT_RESUBMIT:
1982     case OFPACT_LEARN:
1983     case OFPACT_MULTIPATH:
1984     case OFPACT_NOTE:
1985     case OFPACT_EXIT:
1986     case OFPACT_PUSH_MPLS:
1987     case OFPACT_POP_MPLS:
1988     case OFPACT_SAMPLE:
1989     case OFPACT_CLEAR_ACTIONS:
1990     case OFPACT_GOTO_TABLE:
1991     case OFPACT_METER:
1992     default:
1993         return false;
1994     }
1995 }
1996
1997 /* Returns true if any action in the 'ofpacts_len' bytes of 'ofpacts' outputs
1998  * to 'port', false otherwise. */
1999 bool
2000 ofpacts_output_to_port(const struct ofpact *ofpacts, size_t ofpacts_len,
2001                        ofp_port_t port)
2002 {
2003     const struct ofpact *a;
2004
2005     OFPACT_FOR_EACH (a, ofpacts, ofpacts_len) {
2006         if (ofpact_outputs_to_port(a, port)) {
2007             return true;
2008         }
2009     }
2010
2011     return false;
2012 }
2013
2014 bool
2015 ofpacts_equal(const struct ofpact *a, size_t a_len,
2016               const struct ofpact *b, size_t b_len)
2017 {
2018     return a_len == b_len && !memcmp(a, b, a_len);
2019 }
2020 \f
2021 /* Formatting ofpacts. */
2022
2023 static void
2024 print_note(const struct ofpact_note *note, struct ds *string)
2025 {
2026     size_t i;
2027
2028     ds_put_cstr(string, "note:");
2029     for (i = 0; i < note->length; i++) {
2030         if (i) {
2031             ds_put_char(string, '.');
2032         }
2033         ds_put_format(string, "%02"PRIx8, note->data[i]);
2034     }
2035 }
2036
2037 static void
2038 print_dec_ttl(const struct ofpact_cnt_ids *ids,
2039               struct ds *s)
2040 {
2041     size_t i;
2042
2043     ds_put_cstr(s, "dec_ttl");
2044     if (ids->ofpact.compat == OFPUTIL_NXAST_DEC_TTL_CNT_IDS) {
2045         ds_put_cstr(s, "(");
2046         for (i = 0; i < ids->n_controllers; i++) {
2047             if (i) {
2048                 ds_put_cstr(s, ",");
2049             }
2050             ds_put_format(s, "%"PRIu16, ids->cnt_ids[i]);
2051         }
2052         ds_put_cstr(s, ")");
2053     }
2054 }
2055
2056 static void
2057 print_fin_timeout(const struct ofpact_fin_timeout *fin_timeout,
2058                   struct ds *s)
2059 {
2060     ds_put_cstr(s, "fin_timeout(");
2061     if (fin_timeout->fin_idle_timeout) {
2062         ds_put_format(s, "idle_timeout=%"PRIu16",",
2063                       fin_timeout->fin_idle_timeout);
2064     }
2065     if (fin_timeout->fin_hard_timeout) {
2066         ds_put_format(s, "hard_timeout=%"PRIu16",",
2067                       fin_timeout->fin_hard_timeout);
2068     }
2069     ds_chomp(s, ',');
2070     ds_put_char(s, ')');
2071 }
2072
2073 static void
2074 ofpact_format(const struct ofpact *a, struct ds *s)
2075 {
2076     const struct ofpact_enqueue *enqueue;
2077     const struct ofpact_resubmit *resubmit;
2078     const struct ofpact_controller *controller;
2079     const struct ofpact_metadata *metadata;
2080     const struct ofpact_tunnel *tunnel;
2081     const struct ofpact_sample *sample;
2082     ofp_port_t port;
2083
2084     switch (a->type) {
2085     case OFPACT_OUTPUT:
2086         port = ofpact_get_OUTPUT(a)->port;
2087         if (ofp_to_u16(port) < ofp_to_u16(OFPP_MAX)) {
2088             ds_put_format(s, "output:%"PRIu16, port);
2089         } else {
2090             ofputil_format_port(port, s);
2091             if (port == OFPP_CONTROLLER) {
2092                 ds_put_format(s, ":%"PRIu16, ofpact_get_OUTPUT(a)->max_len);
2093             }
2094         }
2095         break;
2096
2097     case OFPACT_CONTROLLER:
2098         controller = ofpact_get_CONTROLLER(a);
2099         if (controller->reason == OFPR_ACTION &&
2100             controller->controller_id == 0) {
2101             ds_put_format(s, "CONTROLLER:%"PRIu16,
2102                           ofpact_get_CONTROLLER(a)->max_len);
2103         } else {
2104             enum ofp_packet_in_reason reason = controller->reason;
2105
2106             ds_put_cstr(s, "controller(");
2107             if (reason != OFPR_ACTION) {
2108                 char reasonbuf[OFPUTIL_PACKET_IN_REASON_BUFSIZE];
2109
2110                 ds_put_format(s, "reason=%s,",
2111                               ofputil_packet_in_reason_to_string(
2112                                   reason, reasonbuf, sizeof reasonbuf));
2113             }
2114             if (controller->max_len != UINT16_MAX) {
2115                 ds_put_format(s, "max_len=%"PRIu16",", controller->max_len);
2116             }
2117             if (controller->controller_id != 0) {
2118                 ds_put_format(s, "id=%"PRIu16",", controller->controller_id);
2119             }
2120             ds_chomp(s, ',');
2121             ds_put_char(s, ')');
2122         }
2123         break;
2124
2125     case OFPACT_ENQUEUE:
2126         enqueue = ofpact_get_ENQUEUE(a);
2127         ds_put_format(s, "enqueue:");
2128         ofputil_format_port(enqueue->port, s);
2129         ds_put_format(s, "q%"PRIu32, enqueue->queue);
2130         break;
2131
2132     case OFPACT_OUTPUT_REG:
2133         ds_put_cstr(s, "output:");
2134         mf_format_subfield(&ofpact_get_OUTPUT_REG(a)->src, s);
2135         break;
2136
2137     case OFPACT_BUNDLE:
2138         bundle_format(ofpact_get_BUNDLE(a), s);
2139         break;
2140
2141     case OFPACT_SET_VLAN_VID:
2142         ds_put_format(s, "mod_vlan_vid:%"PRIu16,
2143                       ofpact_get_SET_VLAN_VID(a)->vlan_vid);
2144         break;
2145
2146     case OFPACT_SET_VLAN_PCP:
2147         ds_put_format(s, "mod_vlan_pcp:%"PRIu8,
2148                       ofpact_get_SET_VLAN_PCP(a)->vlan_pcp);
2149         break;
2150
2151     case OFPACT_STRIP_VLAN:
2152         ds_put_cstr(s, "strip_vlan");
2153         break;
2154
2155     case OFPACT_PUSH_VLAN:
2156         /* XXX 802.1AD case*/
2157         ds_put_format(s, "push_vlan:%#"PRIx16, ETH_TYPE_VLAN_8021Q);
2158         break;
2159
2160     case OFPACT_SET_ETH_SRC:
2161         ds_put_format(s, "mod_dl_src:"ETH_ADDR_FMT,
2162                       ETH_ADDR_ARGS(ofpact_get_SET_ETH_SRC(a)->mac));
2163         break;
2164
2165     case OFPACT_SET_ETH_DST:
2166         ds_put_format(s, "mod_dl_dst:"ETH_ADDR_FMT,
2167                       ETH_ADDR_ARGS(ofpact_get_SET_ETH_DST(a)->mac));
2168         break;
2169
2170     case OFPACT_SET_IPV4_SRC:
2171         ds_put_format(s, "mod_nw_src:"IP_FMT,
2172                       IP_ARGS(ofpact_get_SET_IPV4_SRC(a)->ipv4));
2173         break;
2174
2175     case OFPACT_SET_IPV4_DST:
2176         ds_put_format(s, "mod_nw_dst:"IP_FMT,
2177                       IP_ARGS(ofpact_get_SET_IPV4_DST(a)->ipv4));
2178         break;
2179
2180     case OFPACT_SET_IPV4_DSCP:
2181         ds_put_format(s, "mod_nw_tos:%d", ofpact_get_SET_IPV4_DSCP(a)->dscp);
2182         break;
2183
2184     case OFPACT_SET_L4_SRC_PORT:
2185         ds_put_format(s, "mod_tp_src:%d", ofpact_get_SET_L4_SRC_PORT(a)->port);
2186         break;
2187
2188     case OFPACT_SET_L4_DST_PORT:
2189         ds_put_format(s, "mod_tp_dst:%d", ofpact_get_SET_L4_DST_PORT(a)->port);
2190         break;
2191
2192     case OFPACT_REG_MOVE:
2193         nxm_format_reg_move(ofpact_get_REG_MOVE(a), s);
2194         break;
2195
2196     case OFPACT_REG_LOAD:
2197         nxm_format_reg_load(ofpact_get_REG_LOAD(a), s);
2198         break;
2199
2200     case OFPACT_STACK_PUSH:
2201         nxm_format_stack_push(ofpact_get_STACK_PUSH(a), s);
2202         break;
2203
2204     case OFPACT_STACK_POP:
2205         nxm_format_stack_pop(ofpact_get_STACK_POP(a), s);
2206         break;
2207
2208     case OFPACT_DEC_TTL:
2209         print_dec_ttl(ofpact_get_DEC_TTL(a), s);
2210         break;
2211
2212     case OFPACT_SET_MPLS_TTL:
2213         ds_put_format(s, "set_mpls_ttl(%"PRIu8")",
2214                       ofpact_get_SET_MPLS_TTL(a)->ttl);
2215         break;
2216
2217     case OFPACT_DEC_MPLS_TTL:
2218         ds_put_cstr(s, "dec_mpls_ttl");
2219         break;
2220
2221     case OFPACT_SET_TUNNEL:
2222         tunnel = ofpact_get_SET_TUNNEL(a);
2223         ds_put_format(s, "set_tunnel%s:%#"PRIx64,
2224                       (tunnel->tun_id > UINT32_MAX
2225                        || a->compat == OFPUTIL_NXAST_SET_TUNNEL64 ? "64" : ""),
2226                       tunnel->tun_id);
2227         break;
2228
2229     case OFPACT_SET_QUEUE:
2230         ds_put_format(s, "set_queue:%"PRIu32,
2231                       ofpact_get_SET_QUEUE(a)->queue_id);
2232         break;
2233
2234     case OFPACT_POP_QUEUE:
2235         ds_put_cstr(s, "pop_queue");
2236         break;
2237
2238     case OFPACT_FIN_TIMEOUT:
2239         print_fin_timeout(ofpact_get_FIN_TIMEOUT(a), s);
2240         break;
2241
2242     case OFPACT_RESUBMIT:
2243         resubmit = ofpact_get_RESUBMIT(a);
2244         if (resubmit->in_port != OFPP_IN_PORT && resubmit->table_id == 255) {
2245             ds_put_cstr(s, "resubmit:");
2246             ofputil_format_port(resubmit->in_port, s);
2247         } else {
2248             ds_put_format(s, "resubmit(");
2249             if (resubmit->in_port != OFPP_IN_PORT) {
2250                 ofputil_format_port(resubmit->in_port, s);
2251             }
2252             ds_put_char(s, ',');
2253             if (resubmit->table_id != 255) {
2254                 ds_put_format(s, "%"PRIu8, resubmit->table_id);
2255             }
2256             ds_put_char(s, ')');
2257         }
2258         break;
2259
2260     case OFPACT_LEARN:
2261         learn_format(ofpact_get_LEARN(a), s);
2262         break;
2263
2264     case OFPACT_MULTIPATH:
2265         multipath_format(ofpact_get_MULTIPATH(a), s);
2266         break;
2267
2268     case OFPACT_NOTE:
2269         print_note(ofpact_get_NOTE(a), s);
2270         break;
2271
2272     case OFPACT_PUSH_MPLS:
2273         ds_put_format(s, "push_mpls:0x%04"PRIx16,
2274                       ntohs(ofpact_get_PUSH_MPLS(a)->ethertype));
2275         break;
2276
2277     case OFPACT_POP_MPLS:
2278         ds_put_format(s, "pop_mpls:0x%04"PRIx16,
2279                       ntohs(ofpact_get_POP_MPLS(a)->ethertype));
2280         break;
2281
2282     case OFPACT_EXIT:
2283         ds_put_cstr(s, "exit");
2284         break;
2285
2286     case OFPACT_SAMPLE:
2287         sample = ofpact_get_SAMPLE(a);
2288         ds_put_format(
2289             s, "sample(probability=%"PRIu16",collector_set_id=%"PRIu32
2290             ",obs_domain_id=%"PRIu32",obs_point_id=%"PRIu32")",
2291             sample->probability, sample->collector_set_id,
2292             sample->obs_domain_id, sample->obs_point_id);
2293         break;
2294
2295     case OFPACT_CLEAR_ACTIONS:
2296         ds_put_format(s, "%s",
2297                       ofpact_instruction_name_from_type(
2298                           OVSINST_OFPIT11_CLEAR_ACTIONS));
2299         break;
2300
2301     case OFPACT_WRITE_METADATA:
2302         metadata = ofpact_get_WRITE_METADATA(a);
2303         ds_put_format(s, "%s:%#"PRIx64,
2304                       ofpact_instruction_name_from_type(
2305                           OVSINST_OFPIT11_WRITE_METADATA),
2306                       ntohll(metadata->metadata));
2307         if (metadata->mask != htonll(UINT64_MAX)) {
2308             ds_put_format(s, "/%#"PRIx64, ntohll(metadata->mask));
2309         }
2310         break;
2311
2312     case OFPACT_GOTO_TABLE:
2313         ds_put_format(s, "%s:%"PRIu8,
2314                       ofpact_instruction_name_from_type(
2315                           OVSINST_OFPIT11_GOTO_TABLE),
2316                       ofpact_get_GOTO_TABLE(a)->table_id);
2317         break;
2318
2319     case OFPACT_METER:
2320         ds_put_format(s, "%s:%"PRIu32,
2321                       ofpact_instruction_name_from_type(OVSINST_OFPIT13_METER),
2322                       ofpact_get_METER(a)->meter_id);
2323         break;
2324     }
2325 }
2326
2327 /* Appends a string representing the 'ofpacts_len' bytes of ofpacts in
2328  * 'ofpacts' to 'string'. */
2329 void
2330 ofpacts_format(const struct ofpact *ofpacts, size_t ofpacts_len,
2331                struct ds *string)
2332 {
2333     ds_put_cstr(string, "actions=");
2334     if (!ofpacts_len) {
2335         ds_put_cstr(string, "drop");
2336     } else {
2337         const struct ofpact *a;
2338
2339         OFPACT_FOR_EACH (a, ofpacts, ofpacts_len) {
2340             if (a != ofpacts) {
2341                 ds_put_cstr(string, ",");
2342             }
2343
2344             /* XXX write-actions */
2345             ofpact_format(a, string);
2346         }
2347     }
2348 }
2349 \f
2350 /* Internal use by helpers. */
2351
2352 void *
2353 ofpact_put(struct ofpbuf *ofpacts, enum ofpact_type type, size_t len)
2354 {
2355     struct ofpact *ofpact;
2356
2357     ofpact_pad(ofpacts);
2358     ofpact = ofpacts->l2 = ofpbuf_put_uninit(ofpacts, len);
2359     ofpact_init(ofpact, type, len);
2360     return ofpact;
2361 }
2362
2363 void
2364 ofpact_init(struct ofpact *ofpact, enum ofpact_type type, size_t len)
2365 {
2366     memset(ofpact, 0, len);
2367     ofpact->type = type;
2368     ofpact->compat = OFPUTIL_ACTION_INVALID;
2369     ofpact->len = len;
2370 }
2371 \f
2372 /* Updates 'ofpact->len' to the number of bytes in the tail of 'ofpacts'
2373  * starting at 'ofpact'.
2374  *
2375  * This is the correct way to update a variable-length ofpact's length after
2376  * adding the variable-length part of the payload.  (See the large comment
2377  * near the end of ofp-actions.h for more information.) */
2378 void
2379 ofpact_update_len(struct ofpbuf *ofpacts, struct ofpact *ofpact)
2380 {
2381     ovs_assert(ofpact == ofpacts->l2);
2382     ofpact->len = (char *) ofpbuf_tail(ofpacts) - (char *) ofpact;
2383 }
2384
2385 /* Pads out 'ofpacts' to a multiple of OFPACT_ALIGNTO bytes in length.  Each
2386  * ofpact_put_<ENUM>() calls this function automatically beforehand, but the
2387  * client must call this itself after adding the final ofpact to an array of
2388  * them.
2389  *
2390  * (The consequences of failing to call this function are probably not dire.
2391  * OFPACT_FOR_EACH will calculate a pointer beyond the end of the ofpacts, but
2392  * not dereference it.  That's undefined behavior, technically, but it will not
2393  * cause a real problem on common systems.  Still, it seems better to call
2394  * it.) */
2395 void
2396 ofpact_pad(struct ofpbuf *ofpacts)
2397 {
2398     unsigned int rem = ofpacts->size % OFPACT_ALIGNTO;
2399     if (rem) {
2400         ofpbuf_put_zeros(ofpacts, OFPACT_ALIGNTO - rem);
2401     }
2402 }
2403
2404 void
2405 ofpact_set_field_init(struct ofpact_reg_load *load, const struct mf_field *mf,
2406                       const void *src)
2407 {
2408     load->ofpact.compat = OFPUTIL_OFPAT12_SET_FIELD;
2409     load->dst.field = mf;
2410     load->dst.ofs = 0;
2411     load->dst.n_bits = mf->n_bits;
2412     bitwise_copy(src, mf->n_bytes, load->dst.ofs,
2413                  &load->subvalue, sizeof load->subvalue, 0, mf->n_bits);
2414 }