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 union ofp_action {
  39     ovs_be16 type;
  40     struct ofp_action_header header;
  41     struct ofp_action_vendor_header vendor;
  42     struct ofp10_action_output output10;
  43     struct ofp_action_vlan_vid vlan_vid;
  44     struct ofp_action_vlan_pcp vlan_pcp;
  45     struct ofp_action_nw_addr nw_addr;
  46     struct ofp_action_nw_tos nw_tos;
  47     struct ofp11_action_nw_ecn nw_ecn;
  48     struct ofp11_action_nw_ttl nw_ttl;
  49     struct ofp_action_tp_port tp_port;
  50     struct ofp_action_dl_addr dl_addr;
  51     struct ofp10_action_enqueue enqueue;
  52     struct ofp11_action_output ofp11_output;
  53     struct ofp11_action_push push;
  54     struct ofp11_action_pop_mpls ofp11_pop_mpls;
  55     struct ofp11_action_set_queue ofp11_set_queue;
  56     struct ofp11_action_mpls_label ofp11_mpls_label;
  57     struct ofp11_action_mpls_tc ofp11_mpls_tc;
  58     struct ofp11_action_mpls_ttl ofp11_mpls_ttl;
  59     struct ofp11_action_group group;
  60     struct ofp12_action_set_field set_field;
  61     struct nx_action_header nxa_header;
  62     struct nx_action_resubmit resubmit;
  63     struct nx_action_set_tunnel set_tunnel;
  64     struct nx_action_set_tunnel64 set_tunnel64;
  65     struct nx_action_write_metadata write_metadata;
  66     struct nx_action_set_queue set_queue;
  67     struct nx_action_reg_move reg_move;
  68     struct nx_action_reg_load reg_load;
  69     struct nx_action_stack stack;
  70     struct nx_action_note note;
  71     struct nx_action_multipath multipath;
  72     struct nx_action_bundle bundle;
  73     struct nx_action_output_reg output_reg;
  74     struct nx_action_cnt_ids cnt_ids;
  75     struct nx_action_fin_timeout fin_timeout;
  76     struct nx_action_controller controller;
  77     struct nx_action_push_mpls push_mpls;
  78     struct nx_action_mpls_ttl mpls_ttl;
  79     struct nx_action_pop_mpls pop_mpls;
  80     struct nx_action_sample sample;
  81     struct nx_action_learn learn;
  82     struct nx_action_mpls_label mpls_label;
  83     struct nx_action_mpls_tc mpls_tc;
  84 };
  85
  86 static enum ofperr
  87 output_from_openflow10(const struct ofp10_action_output *oao,
  88                        struct ofpbuf *out)
  89 {
  90     struct ofpact_output *output;
  91
  92     output = ofpact_put_OUTPUT(out);
  93     output->port = u16_to_ofp(ntohs(oao->port));
  94     output->max_len = ntohs(oao->max_len);
  95
  96     return ofpact_check_output_port(output->port, OFPP_MAX);
  97 }
  98
  99 static enum ofperr
 100 enqueue_from_openflow10(const struct ofp10_action_enqueue *oae,
 101                         struct ofpbuf *out)
 102 {
 103     struct ofpact_enqueue *enqueue;
 104
 105     enqueue = ofpact_put_ENQUEUE(out);
 106     enqueue->port = u16_to_ofp(ntohs(oae->port));
 107     enqueue->queue = ntohl(oae->queue_id);
 108     if (ofp_to_u16(enqueue->port) >= ofp_to_u16(OFPP_MAX)
 109         && enqueue->port != OFPP_IN_PORT
 110         && enqueue->port != OFPP_LOCAL) {
 111         return OFPERR_OFPBAC_BAD_OUT_PORT;
 112     }
 113     return 0;
 114 }
 115
 116 static void
 117 resubmit_from_openflow(const struct nx_action_resubmit *nar,
 118                        struct ofpbuf *out)
 119 {
 120     struct ofpact_resubmit *resubmit;
 121
 122     resubmit = ofpact_put_RESUBMIT(out);
 123     resubmit->ofpact.compat = OFPUTIL_NXAST_RESUBMIT;
 124     resubmit->in_port = u16_to_ofp(ntohs(nar->in_port));
 125     resubmit->table_id = 0xff;
 126 }
 127
 128 static enum ofperr
 129 resubmit_table_from_openflow(const struct nx_action_resubmit *nar,
 130                              struct ofpbuf *out)
 131 {
 132     struct ofpact_resubmit *resubmit;
 133
 134     if (nar->pad[0] || nar->pad[1] || nar->pad[2]) {
 135         return OFPERR_OFPBAC_BAD_ARGUMENT;
 136     }
 137
 138     resubmit = ofpact_put_RESUBMIT(out);
 139     resubmit->ofpact.compat = OFPUTIL_NXAST_RESUBMIT_TABLE;
 140     resubmit->in_port = u16_to_ofp(ntohs(nar->in_port));
 141     resubmit->table_id = nar->table;
 142     return 0;
 143 }
 144
 145 static enum ofperr
 146 output_reg_from_openflow(const struct nx_action_output_reg *naor,
 147                          struct ofpbuf *out)
 148 {
 149     struct ofpact_output_reg *output_reg;
 150
 151     if (!is_all_zeros(naor->zero, sizeof naor->zero)) {
 152         return OFPERR_OFPBAC_BAD_ARGUMENT;
 153     }
 154
 155     output_reg = ofpact_put_OUTPUT_REG(out);
 156     output_reg->src.field = mf_from_nxm_header(ntohl(naor->src));
 157     output_reg->src.ofs = nxm_decode_ofs(naor->ofs_nbits);
 158     output_reg->src.n_bits = nxm_decode_n_bits(naor->ofs_nbits);
 159     output_reg->max_len = ntohs(naor->max_len);
 160
 161     return mf_check_src(&output_reg->src, NULL);
 162 }
 163
 164 static void
 165 fin_timeout_from_openflow(const struct nx_action_fin_timeout *naft,
 166                           struct ofpbuf *out)
 167 {
 168     struct ofpact_fin_timeout *oft;
 169
 170     oft = ofpact_put_FIN_TIMEOUT(out);
 171     oft->fin_idle_timeout = ntohs(naft->fin_idle_timeout);
 172     oft->fin_hard_timeout = ntohs(naft->fin_hard_timeout);
 173 }
 174
 175 static void
 176 controller_from_openflow(const struct nx_action_controller *nac,
 177                          struct ofpbuf *out)
 178 {
 179     struct ofpact_controller *oc;
 180
 181     oc = ofpact_put_CONTROLLER(out);
 182     oc->max_len = ntohs(nac->max_len);
 183     oc->controller_id = ntohs(nac->controller_id);
 184     oc->reason = nac->reason;
 185 }
 186
 187 static enum ofperr
 188 metadata_from_nxast(const struct nx_action_write_metadata *nawm,
 189                     struct ofpbuf *out)
 190 {
 191     struct ofpact_metadata *om;
 192
 193     if (!is_all_zeros(nawm->zeros, sizeof nawm->zeros)) {
 194         return OFPERR_NXBRC_MUST_BE_ZERO;
 195     }
 196
 197     om = ofpact_put_WRITE_METADATA(out);
 198     om->metadata = nawm->metadata;
 199     om->mask = nawm->mask;
 200
 201     return 0;
 202 }
 203
 204 static void
 205 note_from_openflow(const struct nx_action_note *nan, struct ofpbuf *out)
 206 {
 207     struct ofpact_note *note;
 208     unsigned int length;
 209
 210     length = ntohs(nan->len) - offsetof(struct nx_action_note, note);
 211     note = ofpact_put(out, OFPACT_NOTE,
 212                       offsetof(struct ofpact_note, data) + length);
 213     note->length = length;
 214     memcpy(note->data, nan->note, length);
 215 }
 216
 217 static enum ofperr
 218 dec_ttl_from_openflow(struct ofpbuf *out, enum ofputil_action_code compat)
 219 {
 220     uint16_t id = 0;
 221     struct ofpact_cnt_ids *ids;
 222     enum ofperr error = 0;
 223
 224     ids = ofpact_put_DEC_TTL(out);
 225     ids->ofpact.compat = compat;
 226     ids->n_controllers = 1;
 227     ofpbuf_put(out, &id, sizeof id);
 228     ids = out->l2;
 229     ofpact_update_len(out, &ids->ofpact);
 230     return error;
 231 }
 232
 233 static enum ofperr
 234 dec_ttl_cnt_ids_from_openflow(const struct nx_action_cnt_ids *nac_ids,
 235                               struct ofpbuf *out)
 236 {
 237     struct ofpact_cnt_ids *ids;
 238     size_t ids_size;
 239     int i;
 240
 241     ids = ofpact_put_DEC_TTL(out);
 242     ids->ofpact.compat = OFPUTIL_NXAST_DEC_TTL_CNT_IDS;
 243     ids->n_controllers = ntohs(nac_ids->n_controllers);
 244     ids_size = ntohs(nac_ids->len) - sizeof *nac_ids;
 245
 246     if (!is_all_zeros(nac_ids->zeros, sizeof nac_ids->zeros)) {
 247         return OFPERR_NXBRC_MUST_BE_ZERO;
 248     }
 249
 250     if (ids_size < ids->n_controllers * sizeof(ovs_be16)) {
 251         VLOG_WARN_RL(&rl, "Nicira action dec_ttl_cnt_ids only has %zu bytes "
 252                      "allocated for controller ids.  %zu bytes are required for "
 253                      "%"PRIu16" controllers.", ids_size,
 254                      ids->n_controllers * sizeof(ovs_be16), ids->n_controllers);
 255         return OFPERR_OFPBAC_BAD_LEN;
 256     }
 257
 258     for (i = 0; i < ids->n_controllers; i++) {
 259         uint16_t id = ntohs(((ovs_be16 *)(nac_ids + 1))[i]);
 260         ofpbuf_put(out, &id, sizeof id);
 261         ids = out->l2;
 262     }
 263
 264     ofpact_update_len(out, &ids->ofpact);
 265
 266     return 0;
 267 }
 268
 269 static enum ofperr
 270 sample_from_openflow(const struct nx_action_sample *nas,
 271                      struct ofpbuf *out)
 272 {
 273     struct ofpact_sample *sample;
 274
 275     sample = ofpact_put_SAMPLE(out);
 276     sample->probability = ntohs(nas->probability);
 277     sample->collector_set_id = ntohl(nas->collector_set_id);
 278     sample->obs_domain_id = ntohl(nas->obs_domain_id);
 279     sample->obs_point_id = ntohl(nas->obs_point_id);
 280
 281     if (sample->probability == 0) {
 282         return OFPERR_OFPBAC_BAD_ARGUMENT;
 283     }
 284
 285     return 0;
 286 }
 287
 288 static enum ofperr
 289 push_mpls_from_openflow(ovs_be16 ethertype, enum ofpact_mpls_position position,
 290                         struct ofpbuf *out)
 291 {
 292     struct ofpact_push_mpls *oam;
 293
 294     if (!eth_type_mpls(ethertype)) {
 295         return OFPERR_OFPBAC_BAD_ARGUMENT;
 296     }
 297     oam = ofpact_put_PUSH_MPLS(out);
 298     oam->ethertype = ethertype;
 299     oam->position = position;
 300
 301     return 0;
 302 }
 303
 304 static enum ofperr
 305 decode_nxast_action(const union ofp_action *a, enum ofputil_action_code *code)
 306 {
 307     const struct nx_action_header *nah = &a->nxa_header;
 308     uint16_t len = ntohs(a->header.len);
 309
 310     if (len < sizeof(struct nx_action_header)) {
 311         return OFPERR_OFPBAC_BAD_LEN;
 312     } else if (a->vendor.vendor != CONSTANT_HTONL(NX_VENDOR_ID)) {
 313         return OFPERR_OFPBAC_BAD_VENDOR;
 314     }
 315
 316     switch (nah->subtype) {
 317 #define NXAST_ACTION(ENUM, STRUCT, EXTENSIBLE, NAME)    \
 318         case CONSTANT_HTONS(ENUM):                      \
 319             if (EXTENSIBLE                              \
 320                 ? len >= sizeof(struct STRUCT)          \
 321                 : len == sizeof(struct STRUCT)) {       \
 322                 *code = OFPUTIL_##ENUM;                 \
 323                 return 0;                               \
 324             } else {                                    \
 325                 return OFPERR_OFPBAC_BAD_LEN;           \
 326             }                                           \
 327             NOT_REACHED();
 328 #include "ofp-util.def"
 329
 330     case CONSTANT_HTONS(NXAST_SNAT__OBSOLETE):
 331     case CONSTANT_HTONS(NXAST_DROP_SPOOFED_ARP__OBSOLETE):
 332     default:
 333         return OFPERR_OFPBAC_BAD_TYPE;
 334     }
 335 }
 336
 337 /* Parses 'a' to determine its type.  On success stores the correct type into
 338  * '*code' and returns 0.  On failure returns an OFPERR_* error code and
 339  * '*code' is indeterminate.
 340  *
 341  * The caller must have already verified that 'a''s length is potentially
 342  * correct (that is, a->header.len is nonzero and a multiple of
 343  * OFP_ACTION_ALIGN and no longer than the amount of space allocated to 'a').
 344  *
 345  * This function verifies that 'a''s length is correct for the type of action
 346  * that it represents. */
 347 static enum ofperr
 348 decode_openflow10_action(const union ofp_action *a,
 349                          enum ofputil_action_code *code)
 350 {
 351     switch (a->type) {
 352     case CONSTANT_HTONS(OFPAT10_VENDOR):
 353         return decode_nxast_action(a, code);
 354
 355 #define OFPAT10_ACTION(ENUM, STRUCT, NAME)                          \
 356         case CONSTANT_HTONS(ENUM):                                  \
 357             if (a->header.len == htons(sizeof(struct STRUCT))) {    \
 358                 *code = OFPUTIL_##ENUM;                             \
 359                 return 0;                                           \
 360             } else {                                                \
 361                 return OFPERR_OFPBAC_BAD_LEN;                       \
 362             }                                                       \
 363             break;
 364 #include "ofp-util.def"
 365
 366     default:
 367         return OFPERR_OFPBAC_BAD_TYPE;
 368     }
 369 }
 370
 371 static enum ofperr
 372 ofpact_from_nxast(const union ofp_action *a, enum ofputil_action_code code,
 373                   struct ofpbuf *out)
 374 {
 375     struct ofpact_tunnel *tunnel;
 376     enum ofperr error = 0;
 377
 378     switch (code) {
 379     case OFPUTIL_ACTION_INVALID:
 380 #define OFPAT10_ACTION(ENUM, STRUCT, NAME) case OFPUTIL_##ENUM:
 381 #define OFPAT11_ACTION(ENUM, STRUCT, EXTENSIBLE, NAME) case OFPUTIL_##ENUM:
 382 #include "ofp-util.def"
 383         NOT_REACHED();
 384
 385     case OFPUTIL_NXAST_RESUBMIT:
 386         resubmit_from_openflow(&a->resubmit, out);
 387         break;
 388
 389     case OFPUTIL_NXAST_SET_TUNNEL:
 390         tunnel = ofpact_put_SET_TUNNEL(out);
 391         tunnel->ofpact.compat = code;
 392         tunnel->tun_id = ntohl(a->set_tunnel.tun_id);
 393         break;
 394
 395     case OFPUTIL_NXAST_WRITE_METADATA:
 396         error = metadata_from_nxast(&a->write_metadata, out);
 397         break;
 398
 399     case OFPUTIL_NXAST_SET_QUEUE:
 400         ofpact_put_SET_QUEUE(out)->queue_id = ntohl(a->set_queue.queue_id);
 401         break;
 402
 403     case OFPUTIL_NXAST_POP_QUEUE:
 404         ofpact_put_POP_QUEUE(out);
 405         break;
 406
 407     case OFPUTIL_NXAST_REG_MOVE:
 408         error = nxm_reg_move_from_openflow(&a->reg_move, out);
 409         break;
 410
 411     case OFPUTIL_NXAST_REG_LOAD:
 412         error = nxm_reg_load_from_openflow(&a->reg_load, out);
 413         break;
 414
 415     case OFPUTIL_NXAST_STACK_PUSH:
 416         error = nxm_stack_push_from_openflow(&a->stack, out);
 417         break;
 418
 419     case OFPUTIL_NXAST_STACK_POP:
 420         error = nxm_stack_pop_from_openflow(&a->stack, out);
 421         break;
 422
 423     case OFPUTIL_NXAST_NOTE:
 424         note_from_openflow(&a->note, out);
 425         break;
 426
 427     case OFPUTIL_NXAST_SET_TUNNEL64:
 428         tunnel = ofpact_put_SET_TUNNEL(out);
 429         tunnel->ofpact.compat = code;
 430         tunnel->tun_id = ntohll(a->set_tunnel64.tun_id);
 431         break;
 432
 433     case OFPUTIL_NXAST_MULTIPATH:
 434         error = multipath_from_openflow(&a->multipath,
 435                                         ofpact_put_MULTIPATH(out));
 436         break;
 437
 438     case OFPUTIL_NXAST_BUNDLE:
 439     case OFPUTIL_NXAST_BUNDLE_LOAD:
 440         error = bundle_from_openflow(&a->bundle, out);
 441         break;
 442
 443     case OFPUTIL_NXAST_OUTPUT_REG:
 444         error = output_reg_from_openflow(&a->output_reg, out);
 445         break;
 446
 447     case OFPUTIL_NXAST_RESUBMIT_TABLE:
 448         error = resubmit_table_from_openflow(&a->resubmit, out);
 449         break;
 450
 451     case OFPUTIL_NXAST_LEARN:
 452         error = learn_from_openflow(&a->learn, out);
 453         break;
 454
 455     case OFPUTIL_NXAST_EXIT:
 456         ofpact_put_EXIT(out);
 457         break;
 458
 459     case OFPUTIL_NXAST_DEC_TTL:
 460         error = dec_ttl_from_openflow(out, code);
 461         break;
 462
 463     case OFPUTIL_NXAST_DEC_TTL_CNT_IDS:
 464         error = dec_ttl_cnt_ids_from_openflow(&a->cnt_ids, out);
 465         break;
 466
 467     case OFPUTIL_NXAST_FIN_TIMEOUT:
 468         fin_timeout_from_openflow(&a->fin_timeout, out);
 469         break;
 470
 471     case OFPUTIL_NXAST_CONTROLLER:
 472         controller_from_openflow(&a->controller, out);
 473         break;
 474
 475     case OFPUTIL_NXAST_PUSH_MPLS:
 476         error = push_mpls_from_openflow(a->push_mpls.ethertype,
 477                                         OFPACT_MPLS_AFTER_VLAN, out);
 478         break;
 479
 480     case OFPUTIL_NXAST_SET_MPLS_LABEL:
 481         ofpact_put_SET_MPLS_LABEL(out)->label = a->mpls_label.label;
 482         break;
 483
 484     case OFPUTIL_NXAST_SET_MPLS_TC:
 485         ofpact_put_SET_MPLS_TC(out)->tc = a->mpls_tc.tc;
 486         break;
 487
 488     case OFPUTIL_NXAST_SET_MPLS_TTL:
 489         ofpact_put_SET_MPLS_TTL(out)->ttl = a->mpls_ttl.ttl;
 490         break;
 491
 492     case OFPUTIL_NXAST_DEC_MPLS_TTL:
 493         ofpact_put_DEC_MPLS_TTL(out);
 494         break;
 495
 496     case OFPUTIL_NXAST_POP_MPLS:
 497         if (eth_type_mpls(a->pop_mpls.ethertype)) {
 498             return OFPERR_OFPBAC_BAD_ARGUMENT;
 499         }
 500         ofpact_put_POP_MPLS(out)->ethertype = a->pop_mpls.ethertype;
 501         break;
 502
 503     case OFPUTIL_NXAST_SAMPLE:
 504         error = sample_from_openflow(&a->sample, out);
 505         break;
 506     }
 507
 508     return error;
 509 }
 510
 511 static enum ofperr
 512 ofpact_from_openflow10(const union ofp_action *a,
 513                        enum ofp_version version OVS_UNUSED,
 514                        struct ofpbuf *out)
 515 {
 516     enum ofputil_action_code code;
 517     enum ofperr error;
 518     struct ofpact_vlan_vid *vlan_vid;
 519     struct ofpact_vlan_pcp *vlan_pcp;
 520
 521     error = decode_openflow10_action(a, &code);
 522     if (error) {
 523         return error;
 524     }
 525
 526     switch (code) {
 527     case OFPUTIL_ACTION_INVALID:
 528 #define OFPAT11_ACTION(ENUM, STRUCT, EXTENSIBLE, NAME) case OFPUTIL_##ENUM:
 529 #include "ofp-util.def"
 530         NOT_REACHED();
 531
 532     case OFPUTIL_OFPAT10_OUTPUT:
 533         return output_from_openflow10(&a->output10, out);
 534
 535     case OFPUTIL_OFPAT10_SET_VLAN_VID:
 536         if (a->vlan_vid.vlan_vid & ~htons(0xfff)) {
 537             return OFPERR_OFPBAC_BAD_ARGUMENT;
 538         }
 539         vlan_vid = ofpact_put_SET_VLAN_VID(out);
 540         vlan_vid->vlan_vid = ntohs(a->vlan_vid.vlan_vid);
 541         vlan_vid->push_vlan_if_needed = true;
 542         vlan_vid->ofpact.compat = code;
 543         break;
 544
 545     case OFPUTIL_OFPAT10_SET_VLAN_PCP:
 546         if (a->vlan_pcp.vlan_pcp & ~7) {
 547             return OFPERR_OFPBAC_BAD_ARGUMENT;
 548         }
 549         vlan_pcp = ofpact_put_SET_VLAN_PCP(out);
 550         vlan_pcp->vlan_pcp = a->vlan_pcp.vlan_pcp;
 551         vlan_pcp->push_vlan_if_needed = true;
 552         vlan_pcp->ofpact.compat = code;
 553         break;
 554
 555     case OFPUTIL_OFPAT10_STRIP_VLAN:
 556         ofpact_put_STRIP_VLAN(out)->ofpact.compat = code;
 557         break;
 558
 559     case OFPUTIL_OFPAT10_SET_DL_SRC:
 560         memcpy(ofpact_put_SET_ETH_SRC(out)->mac, a->dl_addr.dl_addr,
 561                ETH_ADDR_LEN);
 562         break;
 563
 564     case OFPUTIL_OFPAT10_SET_DL_DST:
 565         memcpy(ofpact_put_SET_ETH_DST(out)->mac, a->dl_addr.dl_addr,
 566                ETH_ADDR_LEN);
 567         break;
 568
 569     case OFPUTIL_OFPAT10_SET_NW_SRC:
 570         ofpact_put_SET_IPV4_SRC(out)->ipv4 = a->nw_addr.nw_addr;
 571         break;
 572
 573     case OFPUTIL_OFPAT10_SET_NW_DST:
 574         ofpact_put_SET_IPV4_DST(out)->ipv4 = a->nw_addr.nw_addr;
 575         break;
 576
 577     case OFPUTIL_OFPAT10_SET_NW_TOS:
 578         if (a->nw_tos.nw_tos & ~IP_DSCP_MASK) {
 579             return OFPERR_OFPBAC_BAD_ARGUMENT;
 580         }
 581         ofpact_put_SET_IP_DSCP(out)->dscp = a->nw_tos.nw_tos;
 582         break;
 583
 584     case OFPUTIL_OFPAT10_SET_TP_SRC:
 585         ofpact_put_SET_L4_SRC_PORT(out)->port = ntohs(a->tp_port.tp_port);
 586         break;
 587
 588     case OFPUTIL_OFPAT10_SET_TP_DST:
 589         ofpact_put_SET_L4_DST_PORT(out)->port = ntohs(a->tp_port.tp_port);
 590
 591         break;
 592
 593     case OFPUTIL_OFPAT10_ENQUEUE:
 594         error = enqueue_from_openflow10(&a->enqueue, out);
 595         break;
 596
 597 #define NXAST_ACTION(ENUM, STRUCT, EXTENSIBLE, NAME) case OFPUTIL_##ENUM:
 598 #include "ofp-util.def"
 599         return ofpact_from_nxast(a, code, out);
 600     }
 601
 602     return error;
 603 }
 604
 605 static enum ofperr ofpact_from_openflow11(const union ofp_action *,
 606                                           enum ofp_version,
 607                                           struct ofpbuf *out);
 608
 609 static inline union ofp_action *
 610 action_next(const union ofp_action *a)
 611 {
 612     return ((union ofp_action *) (void *)
 613             ((uint8_t *) a + ntohs(a->header.len)));
 614 }
 615
 616 static inline bool
 617 action_is_valid(const union ofp_action *a, size_t max_actions)
 618 {
 619     uint16_t len = ntohs(a->header.len);
 620     return (!(len % OFP_ACTION_ALIGN)
 621             && len >= OFP_ACTION_ALIGN
 622             && len / OFP_ACTION_ALIGN <= max_actions);
 623 }
 624
 625 /* This macro is careful to check for actions with bad lengths. */
 626 #define ACTION_FOR_EACH(ITER, LEFT, ACTIONS, MAX_ACTIONS)                 \
 627     for ((ITER) = (ACTIONS), (LEFT) = (MAX_ACTIONS);                      \
 628          (LEFT) > 0 && action_is_valid(ITER, LEFT);                     \
 629          ((LEFT) -= ntohs((ITER)->header.len) / OFP_ACTION_ALIGN, \
 630           (ITER) = action_next(ITER)))
 631
 632 static void
 633 log_bad_action(const union ofp_action *actions, size_t max_actions,
 634                const union ofp_action *bad_action, enum ofperr error)
 635 {
 636     if (!VLOG_DROP_WARN(&rl)) {
 637         struct ds s;
 638
 639         ds_init(&s);
 640         ds_put_hex_dump(&s, actions, max_actions * OFP_ACTION_ALIGN, 0, false);
 641         VLOG_WARN("bad action at offset %#tx (%s):\n%s",
 642                   (char *)bad_action - (char *)actions,
 643                   ofperr_get_name(error), ds_cstr(&s));
 644         ds_destroy(&s);
 645     }
 646 }
 647
 648 static enum ofperr
 649 ofpacts_from_openflow(const union ofp_action *in, size_t n_in,
 650                       enum ofp_version version, struct ofpbuf *out)
 651 {
 652     const union ofp_action *a;
 653     size_t left;
 654
 655     enum ofperr (*ofpact_from_openflow)(const union ofp_action *a,
 656                                         enum ofp_version,
 657                                         struct ofpbuf *out) =
 658         (version == OFP10_VERSION) ?
 659         ofpact_from_openflow10 : ofpact_from_openflow11;
 660
 661     ACTION_FOR_EACH (a, left, in, n_in) {
 662         enum ofperr error = ofpact_from_openflow(a, version, out);
 663         if (error) {
 664             log_bad_action(in, n_in, a, error);
 665             return error;
 666         }
 667     }
 668     if (left) {
 669         enum ofperr error = OFPERR_OFPBAC_BAD_LEN;
 670         log_bad_action(in, n_in, a, error);
 671         return error;
 672     }
 673
 674     ofpact_pad(out);
 675     return 0;
 676 }
 677
 678 /* Attempts to convert 'actions_len' bytes of OpenFlow actions from the
 679  * front of 'openflow' into ofpacts.  On success, replaces any existing content
 680  * in 'ofpacts' by the converted ofpacts; on failure, clears 'ofpacts'.
 681  * Returns 0 if successful, otherwise an OpenFlow error.
 682  *
 683  * Actions are processed according to their OpenFlow version which
 684  * is provided in the 'version' parameter.
 685  *
 686  * In most places in OpenFlow 1.1 and 1.2, actions appear encapsulated in
 687  * instructions, so you should call ofpacts_pull_openflow_instructions()
 688  * instead of this function.
 689  *
 690  * The parsed actions are valid generically, but they may not be valid in a
 691  * specific context.  For example, port numbers up to OFPP_MAX are valid
 692  * generically, but specific datapaths may only support port numbers in a
 693  * smaller range.  Use ofpacts_check() to additional check whether actions are
 694  * valid in a specific context. */
 695 enum ofperr
 696 ofpacts_pull_openflow_actions(struct ofpbuf *openflow,
 697                               unsigned int actions_len,
 698                               enum ofp_version version,
 699                               struct ofpbuf *ofpacts) {
 700     const union ofp_action *actions;
 701     enum ofperr error;
 702
 703     ofpbuf_clear(ofpacts);
 704
 705     if (actions_len % OFP_ACTION_ALIGN != 0) {
 706         VLOG_WARN_RL(&rl, "OpenFlow message actions length %u is not a "
 707                      "multiple of %d", actions_len, OFP_ACTION_ALIGN);
 708         return OFPERR_OFPBRC_BAD_LEN;
 709     }
 710
 711     actions = ofpbuf_try_pull(openflow, actions_len);
 712     if (actions == NULL) {
 713         VLOG_WARN_RL(&rl, "OpenFlow message actions length %u exceeds "
 714                      "remaining message length (%zu)",
 715                      actions_len, openflow->size);
 716         return OFPERR_OFPBRC_BAD_LEN;
 717     }
 718
 719     error = ofpacts_from_openflow(actions, actions_len / OFP_ACTION_ALIGN,
 720                                   version, ofpacts);
 721     if (error) {
 722         ofpbuf_clear(ofpacts);
 723         return error;
 724     }
 725
 726     error = ofpacts_verify(ofpacts->data, ofpacts->size);
 727     if (error) {
 728         ofpbuf_clear(ofpacts);
 729     }
 730     return error;
 731 }
 732
 733 \f
 734 /* OpenFlow 1.1 actions. */
 735
 736 /* Parses 'a' to determine its type.  On success stores the correct type into
 737  * '*code' and returns 0.  On failure returns an OFPERR_* error code and
 738  * '*code' is indeterminate.
 739  *
 740  * The caller must have already verified that 'a''s length is potentially
 741  * correct (that is, a->header.len is nonzero and a multiple of
 742  * OFP_ACTION_ALIGN and no longer than the amount of space allocated to 'a').
 743  *
 744  * This function verifies that 'a''s length is correct for the type of action
 745  * that it represents. */
 746 static enum ofperr
 747 decode_openflow11_action(const union ofp_action *a,
 748                          enum ofputil_action_code *code)
 749 {
 750     uint16_t len;
 751
 752     switch (a->type) {
 753     case CONSTANT_HTONS(OFPAT11_EXPERIMENTER):
 754         return decode_nxast_action(a, code);
 755
 756 #define OFPAT11_ACTION(ENUM, STRUCT, EXTENSIBLE, NAME)  \
 757         case CONSTANT_HTONS(ENUM):                      \
 758             len = ntohs(a->header.len);                 \
 759             if (EXTENSIBLE                              \
 760                 ? len >= sizeof(struct STRUCT)          \
 761                 : len == sizeof(struct STRUCT)) {       \
 762                 *code = OFPUTIL_##ENUM;                 \
 763                 return 0;                               \
 764             } else {                                    \
 765                 return OFPERR_OFPBAC_BAD_LEN;           \
 766             }                                           \
 767             NOT_REACHED();
 768 #include "ofp-util.def"
 769
 770     default:
 771         return OFPERR_OFPBAC_BAD_TYPE;
 772     }
 773 }
 774
 775 static enum ofperr
 776 set_field_from_openflow(const struct ofp12_action_set_field *oasf,
 777                         struct ofpbuf *ofpacts)
 778 {
 779     uint16_t oasf_len = ntohs(oasf->len);
 780     uint32_t oxm_header = ntohl(oasf->dst);
 781     uint8_t oxm_length = NXM_LENGTH(oxm_header);
 782     struct ofpact_set_field *sf;
 783     const struct mf_field *mf;
 784
 785     /* ofp12_action_set_field is padded to 64 bits by zero */
 786     if (oasf_len != ROUND_UP(sizeof *oasf + oxm_length, 8)) {
 787         return OFPERR_OFPBAC_BAD_SET_LEN;
 788     }
 789     if (!is_all_zeros((const uint8_t *)oasf + sizeof *oasf + oxm_length,
 790                       oasf_len - oxm_length - sizeof *oasf)) {
 791         return OFPERR_OFPBAC_BAD_SET_ARGUMENT;
 792     }
 793
 794     if (NXM_HASMASK(oxm_header)) {
 795         return OFPERR_OFPBAC_BAD_SET_TYPE;
 796     }
 797     mf = mf_from_nxm_header(oxm_header);
 798     if (!mf) {
 799         return OFPERR_OFPBAC_BAD_SET_TYPE;
 800     }
 801     ovs_assert(mf->n_bytes == oxm_length);
 802     /* oxm_length is now validated to be compatible with mf_value. */
 803     if (!mf->writable) {
 804         VLOG_WARN_RL(&rl, "destination field %s is not writable", mf->name);
 805         return OFPERR_OFPBAC_BAD_SET_ARGUMENT;
 806     }
 807     sf = ofpact_put_SET_FIELD(ofpacts);
 808     sf->field = mf;
 809     memcpy(&sf->value, oasf + 1, mf->n_bytes);
 810
 811     /* The value must be valid for match and must have the OFPVID_PRESENT bit
 812      * on for OXM_OF_VLAN_VID. */
 813     if (!mf_is_value_valid(mf, &sf->value)
 814         || (mf->id == MFF_VLAN_VID
 815             && !(sf->value.be16 & htons(OFPVID12_PRESENT)))) {
 816         struct ds ds = DS_EMPTY_INITIALIZER;
 817         mf_format(mf, &sf->value, NULL, &ds);
 818         VLOG_WARN_RL(&rl, "Invalid value for set field %s: %s",
 819                      mf->name, ds_cstr(&ds));
 820         ds_destroy(&ds);
 821
 822         return OFPERR_OFPBAC_BAD_SET_ARGUMENT;
 823     }
 824     return 0;
 825 }
 826
 827 static void
 828 set_field_to_openflow12(const struct ofpact_set_field *sf,
 829                         struct ofpbuf *openflow)
 830 {
 831     uint16_t padded_value_len = ROUND_UP(sf->field->n_bytes, 8);
 832     struct ofp12_action_set_field *oasf;
 833     char *value;
 834
 835     oasf = ofputil_put_OFPAT12_SET_FIELD(openflow);
 836     oasf->dst = htonl(sf->field->oxm_header);
 837     oasf->len = htons(sizeof *oasf + padded_value_len);
 838
 839     value = ofpbuf_put_zeros(openflow, padded_value_len);
 840     memcpy(value, &sf->value, sf->field->n_bytes);
 841 }
 842
 843 /* Convert 'sf' to one or two REG_LOADs. */
 844 static void
 845 set_field_to_nxast(const struct ofpact_set_field *sf, struct ofpbuf *openflow)
 846 {
 847     const struct mf_field *mf = sf->field;
 848     struct nx_action_reg_load *narl;
 849
 850     if (mf->n_bits > 64) {
 851         ovs_assert(mf->n_bytes == 16); /* IPv6 addr. */
 852         /* Split into 64bit chunks */
 853         /* Lower bits first. */
 854         narl = ofputil_put_NXAST_REG_LOAD(openflow);
 855         narl->ofs_nbits = nxm_encode_ofs_nbits(0, 64);
 856         narl->dst = htonl(mf->nxm_header);
 857         memcpy(&narl->value, &sf->value.ipv6.s6_addr[8], sizeof narl->value);
 858         /* Higher bits next. */
 859         narl = ofputil_put_NXAST_REG_LOAD(openflow);
 860         narl->ofs_nbits = nxm_encode_ofs_nbits(64, mf->n_bits - 64);
 861         narl->dst = htonl(mf->nxm_header);
 862         memcpy(&narl->value, &sf->value.ipv6.s6_addr[0], sizeof narl->value);
 863     } else {
 864         narl = ofputil_put_NXAST_REG_LOAD(openflow);
 865         narl->ofs_nbits = nxm_encode_ofs_nbits(0, mf->n_bits);
 866         narl->dst = htonl(mf->nxm_header);
 867         memset(&narl->value, 0, 8 - mf->n_bytes);
 868         memcpy((char*)&narl->value + (8 - mf->n_bytes),
 869                &sf->value, mf->n_bytes);
 870     }
 871 }
 872
 873 /* Convert 'sf' to standard OpenFlow 1.1 actions, if we can, falling back
 874  * to Nicira extensions if we must.
 875  *
 876  * We check only meta-flow types that can appear within set field actions and
 877  * that have a mapping to compatible action types.  These struct mf_field
 878  * definitions have a defined OXM or NXM header value and specify the field as
 879  * writable. */
 880 static void
 881 set_field_to_openflow11(const struct ofpact_set_field *sf,
 882                         struct ofpbuf *openflow)
 883 {
 884     switch ((int) sf->field->id) {
 885     case MFF_VLAN_TCI:
 886         /* NXM_OF_VLAN_TCI to OpenFlow 1.1 mapping:
 887          *
 888          * If CFI=1, Add or modify VLAN VID & PCP.
 889          *    OpenFlow 1.1 set actions only apply if the packet
 890          *    already has VLAN tags.  To be sure that is the case
 891          *    we have to push a VLAN header.  As we do not support
 892          *    multiple layers of VLANs, this is a no-op, if a VLAN
 893          *    header already exists.  This may backfire, however,
 894          *    when we start supporting multiple layers of VLANs.
 895          * If CFI=0, strip VLAN header, if any.
 896          */
 897         if (sf->value.be16 & htons(VLAN_CFI)) {
 898             /* Push a VLAN tag, if one was not seen at action validation
 899              * time. */
 900             if (!sf->flow_has_vlan) {
 901                 ofputil_put_OFPAT11_PUSH_VLAN(openflow)->ethertype
 902                     = htons(ETH_TYPE_VLAN_8021Q);
 903             }
 904             ofputil_put_OFPAT11_SET_VLAN_VID(openflow)->vlan_vid
 905                 = sf->value.be16 & htons(VLAN_VID_MASK);
 906             ofputil_put_OFPAT11_SET_VLAN_PCP(openflow)->vlan_pcp
 907                 = vlan_tci_to_pcp(sf->value.be16);
 908         } else {
 909             /* If the flow did not match on vlan, we have no way of
 910              * knowing if the vlan tag exists, so we must POP just to be
 911              * sure. */
 912             ofputil_put_OFPAT11_POP_VLAN(openflow);
 913         }
 914         break;
 915
 916     case MFF_VLAN_VID:
 917         /* OXM VLAN_PCP to OpenFlow 1.1.
 918          * Set field on OXM_OF_VLAN_VID onlyapplies to an existing vlan
 919          * tag.  Clear the OFPVID_PRESENT bit.
 920          */
 921         ofputil_put_OFPAT11_SET_VLAN_VID(openflow)->vlan_vid
 922             = sf->value.be16 & htons(VLAN_VID_MASK);
 923         break;
 924
 925     case MFF_VLAN_PCP:
 926         /* OXM VLAN_PCP to OpenFlow 1.1.
 927          * OXM_OF_VLAN_PCP only applies to existing vlan tag. */
 928         ofputil_put_OFPAT11_SET_VLAN_PCP(openflow)->vlan_pcp = sf->value.u8;
 929         break;
 930
 931     case MFF_ETH_SRC:
 932         memcpy(ofputil_put_OFPAT11_SET_DL_SRC(openflow)->dl_addr,
 933                sf->value.mac, ETH_ADDR_LEN);
 934         break;
 935
 936     case MFF_ETH_DST:
 937         memcpy(ofputil_put_OFPAT11_SET_DL_DST(openflow)->dl_addr,
 938                sf->value.mac, ETH_ADDR_LEN);
 939         break;
 940
 941     case MFF_MPLS_LABEL:
 942         ofputil_put_OFPAT11_SET_MPLS_LABEL(openflow)->mpls_label =
 943             sf->value.be32;
 944         break;
 945
 946     case MFF_MPLS_TC:
 947         ofputil_put_OFPAT11_SET_MPLS_TC(openflow)->mpls_tc = sf->value.u8;
 948         break;
 949
 950     case MFF_IPV4_SRC:
 951         ofputil_put_OFPAT11_SET_NW_SRC(openflow)->nw_addr = sf->value.be32;
 952         break;
 953
 954     case MFF_IPV4_DST:
 955         ofputil_put_OFPAT11_SET_NW_DST(openflow)->nw_addr = sf->value.be32;
 956         break;
 957
 958     case MFF_IP_DSCP:
 959         ofputil_put_OFPAT11_SET_NW_TOS(openflow)->nw_tos = sf->value.u8;
 960         break;
 961
 962     case MFF_IP_DSCP_SHIFTED:
 963         ofputil_put_OFPAT11_SET_NW_TOS(openflow)->nw_tos = sf->value.u8 << 2;
 964         break;
 965
 966     case MFF_IP_ECN:
 967         ofputil_put_OFPAT11_SET_NW_ECN(openflow)->nw_ecn = sf->value.u8;
 968         break;
 969
 970     case MFF_IP_TTL:
 971         ofputil_put_OFPAT11_SET_NW_TTL(openflow)->nw_ttl = sf->value.u8;
 972         break;
 973
 974     case MFF_TCP_SRC:
 975     case MFF_UDP_SRC:
 976     case MFF_SCTP_SRC:
 977         ofputil_put_OFPAT11_SET_TP_SRC(openflow)->tp_port = sf->value.be16;
 978         break;
 979
 980     case MFF_TCP_DST:
 981     case MFF_UDP_DST:
 982     case MFF_SCTP_DST:
 983         ofputil_put_OFPAT11_SET_TP_DST(openflow)->tp_port = sf->value.be16;
 984         break;
 985
 986     default:
 987         set_field_to_nxast(sf, openflow);
 988         break;
 989     }
 990 }
 991
 992 /* Convert 'sf' to standard OpenFlow 1.0 actions, if we can, falling back
 993  * to Nicira extensions if we must.
 994  *
 995  * We check only meta-flow types that can appear within set field actions and
 996  * that have a mapping to compatible action types.  These struct mf_field
 997  * definitions have a defined OXM or NXM header value and specify the field as
 998  * writable. */
 999 static void
1000 set_field_to_openflow10(const struct ofpact_set_field *sf,
1001                         struct ofpbuf *openflow)
1002 {
1003     switch ((int) sf->field->id) {
1004     case MFF_VLAN_TCI:
1005         /* NXM_OF_VLAN_TCI to OpenFlow 1.0 mapping:
1006          *
1007          * If CFI=1, Add or modify VLAN VID & PCP.
1008          * If CFI=0, strip VLAN header, if any.
1009          */
1010         if (sf->value.be16 & htons(VLAN_CFI)) {
1011             ofputil_put_OFPAT10_SET_VLAN_VID(openflow)->vlan_vid
1012                 = sf->value.be16 & htons(VLAN_VID_MASK);
1013             ofputil_put_OFPAT10_SET_VLAN_PCP(openflow)->vlan_pcp
1014                 = vlan_tci_to_pcp(sf->value.be16);
1015         } else {
1016             ofputil_put_OFPAT10_STRIP_VLAN(openflow);
1017         }
1018         break;
1019
1020     case MFF_VLAN_VID:
1021         /* OXM VLAN_VID to OpenFlow 1.0.
1022          * Set field on OXM_OF_VLAN_VID onlyapplies to an existing vlan
1023          * tag.  Clear the OFPVID_PRESENT bit.
1024          */
1025         ofputil_put_OFPAT10_SET_VLAN_VID(openflow)->vlan_vid
1026             = sf->value.be16 & htons(VLAN_VID_MASK);
1027         break;
1028
1029     case MFF_VLAN_PCP:
1030         /* OXM VLAN_PCP to OpenFlow 1.0.
1031          * OXM_OF_VLAN_PCP only applies to existing vlan tag. */
1032         ofputil_put_OFPAT10_SET_VLAN_PCP(openflow)->vlan_pcp = sf->value.u8;
1033         break;
1034
1035     case MFF_ETH_SRC:
1036         memcpy(ofputil_put_OFPAT10_SET_DL_SRC(openflow)->dl_addr,
1037                sf->value.mac, ETH_ADDR_LEN);
1038         break;
1039
1040     case MFF_ETH_DST:
1041         memcpy(ofputil_put_OFPAT10_SET_DL_DST(openflow)->dl_addr,
1042                sf->value.mac, ETH_ADDR_LEN);
1043         break;
1044
1045     case MFF_IPV4_SRC:
1046         ofputil_put_OFPAT10_SET_NW_SRC(openflow)->nw_addr = sf->value.be32;
1047         break;
1048
1049     case MFF_IPV4_DST:
1050         ofputil_put_OFPAT10_SET_NW_DST(openflow)->nw_addr = sf->value.be32;
1051         break;
1052
1053     case MFF_IP_DSCP:
1054         ofputil_put_OFPAT10_SET_NW_TOS(openflow)->nw_tos = sf->value.u8;
1055         break;
1056
1057     case MFF_IP_DSCP_SHIFTED:
1058         ofputil_put_OFPAT10_SET_NW_TOS(openflow)->nw_tos = sf->value.u8 << 2;
1059         break;
1060
1061     case MFF_TCP_SRC:
1062     case MFF_UDP_SRC:
1063         ofputil_put_OFPAT10_SET_TP_SRC(openflow)->tp_port = sf->value.be16;
1064         break;
1065
1066     case MFF_TCP_DST:
1067     case MFF_UDP_DST:
1068         ofputil_put_OFPAT10_SET_TP_DST(openflow)->tp_port = sf->value.be16;
1069         break;
1070
1071     default:
1072         set_field_to_nxast(sf, openflow);
1073         break;
1074     }
1075 }
1076
1077 static void
1078 set_field_to_openflow(const struct ofpact_set_field *sf,
1079                       struct ofpbuf *openflow)
1080 {
1081     struct ofp_header *oh = (struct ofp_header *)openflow->l2;
1082
1083     if (oh->version >= OFP12_VERSION) {
1084         set_field_to_openflow12(sf, openflow);
1085     } else if (oh->version == OFP11_VERSION) {
1086         set_field_to_openflow11(sf, openflow);
1087     } else if (oh->version == OFP10_VERSION) {
1088         set_field_to_openflow10(sf, openflow);
1089     } else {
1090         NOT_REACHED();
1091     }
1092 }
1093
1094 static enum ofperr
1095 output_from_openflow11(const struct ofp11_action_output *oao,
1096                        struct ofpbuf *out)
1097 {
1098     struct ofpact_output *output;
1099     enum ofperr error;
1100
1101     output = ofpact_put_OUTPUT(out);
1102     output->max_len = ntohs(oao->max_len);
1103
1104     error = ofputil_port_from_ofp11(oao->port, &output->port);
1105     if (error) {
1106         return error;
1107     }
1108
1109     return ofpact_check_output_port(output->port, OFPP_MAX);
1110 }
1111
1112 static enum ofperr
1113 ofpact_from_openflow11(const union ofp_action *a, enum ofp_version version,
1114                        struct ofpbuf *out)
1115 {
1116     enum ofputil_action_code code;
1117     enum ofperr error;
1118     struct ofpact_vlan_vid *vlan_vid;
1119     struct ofpact_vlan_pcp *vlan_pcp;
1120
1121     error = decode_openflow11_action(a, &code);
1122     if (error) {
1123         return error;
1124     }
1125
1126     if (version >= OFP12_VERSION) {
1127         switch ((int)code) {
1128         case OFPUTIL_OFPAT11_SET_VLAN_VID:
1129         case OFPUTIL_OFPAT11_SET_VLAN_PCP:
1130         case OFPUTIL_OFPAT11_SET_DL_SRC:
1131         case OFPUTIL_OFPAT11_SET_DL_DST:
1132         case OFPUTIL_OFPAT11_SET_NW_SRC:
1133         case OFPUTIL_OFPAT11_SET_NW_DST:
1134         case OFPUTIL_OFPAT11_SET_NW_TOS:
1135         case OFPUTIL_OFPAT11_SET_NW_ECN:
1136         case OFPUTIL_OFPAT11_SET_TP_SRC:
1137         case OFPUTIL_OFPAT11_SET_TP_DST:
1138             VLOG_WARN_RL(&rl, "Deprecated action %s received over %s",
1139                          ofputil_action_name_from_code(code),
1140                          ofputil_version_to_string(version));
1141         }
1142     }
1143
1144     switch (code) {
1145     case OFPUTIL_ACTION_INVALID:
1146 #define OFPAT10_ACTION(ENUM, STRUCT, NAME) case OFPUTIL_##ENUM:
1147 #include "ofp-util.def"
1148         NOT_REACHED();
1149
1150     case OFPUTIL_OFPAT11_OUTPUT:
1151         return output_from_openflow11(&a->ofp11_output, out);
1152
1153     case OFPUTIL_OFPAT11_SET_VLAN_VID:
1154         if (a->vlan_vid.vlan_vid & ~htons(0xfff)) {
1155             return OFPERR_OFPBAC_BAD_ARGUMENT;
1156         }
1157         vlan_vid = ofpact_put_SET_VLAN_VID(out);
1158         vlan_vid->vlan_vid = ntohs(a->vlan_vid.vlan_vid);
1159         vlan_vid->push_vlan_if_needed = false;
1160         vlan_vid->ofpact.compat = code;
1161         break;
1162
1163     case OFPUTIL_OFPAT11_SET_VLAN_PCP:
1164         if (a->vlan_pcp.vlan_pcp & ~7) {
1165             return OFPERR_OFPBAC_BAD_ARGUMENT;
1166         }
1167         vlan_pcp = ofpact_put_SET_VLAN_PCP(out);
1168         vlan_pcp->vlan_pcp = a->vlan_pcp.vlan_pcp;
1169         vlan_pcp->push_vlan_if_needed = false;
1170         vlan_pcp->ofpact.compat = code;
1171         break;
1172
1173     case OFPUTIL_OFPAT11_PUSH_VLAN:
1174         if (a->push.ethertype != htons(ETH_TYPE_VLAN_8021Q)) {
1175             /* XXX 802.1AD(QinQ) isn't supported at the moment */
1176             return OFPERR_OFPBAC_BAD_ARGUMENT;
1177         }
1178         ofpact_put_PUSH_VLAN(out);
1179         break;
1180
1181     case OFPUTIL_OFPAT11_POP_VLAN:
1182         ofpact_put_STRIP_VLAN(out)->ofpact.compat = code;
1183         break;
1184
1185     case OFPUTIL_OFPAT11_SET_QUEUE:
1186         ofpact_put_SET_QUEUE(out)->queue_id =
1187             ntohl(a->ofp11_set_queue.queue_id);
1188         break;
1189
1190     case OFPUTIL_OFPAT11_SET_DL_SRC:
1191         memcpy(ofpact_put_SET_ETH_SRC(out)->mac, a->dl_addr.dl_addr,
1192                ETH_ADDR_LEN);
1193         break;
1194
1195     case OFPUTIL_OFPAT11_SET_DL_DST:
1196         memcpy(ofpact_put_SET_ETH_DST(out)->mac, a->dl_addr.dl_addr,
1197                ETH_ADDR_LEN);
1198         break;
1199
1200     case OFPUTIL_OFPAT11_DEC_NW_TTL:
1201         dec_ttl_from_openflow(out, code);
1202         break;
1203
1204     case OFPUTIL_OFPAT11_SET_NW_SRC:
1205         ofpact_put_SET_IPV4_SRC(out)->ipv4 = a->nw_addr.nw_addr;
1206         break;
1207
1208     case OFPUTIL_OFPAT11_SET_NW_DST:
1209         ofpact_put_SET_IPV4_DST(out)->ipv4 = a->nw_addr.nw_addr;
1210         break;
1211
1212     case OFPUTIL_OFPAT11_SET_NW_TOS:
1213         if (a->nw_tos.nw_tos & ~IP_DSCP_MASK) {
1214             return OFPERR_OFPBAC_BAD_ARGUMENT;
1215         }
1216         ofpact_put_SET_IP_DSCP(out)->dscp = a->nw_tos.nw_tos;
1217         break;
1218
1219     case OFPUTIL_OFPAT11_SET_NW_ECN:
1220         if (a->nw_ecn.nw_ecn & ~IP_ECN_MASK) {
1221             return OFPERR_OFPBAC_BAD_ARGUMENT;
1222         }
1223         ofpact_put_SET_IP_ECN(out)->ecn = a->nw_ecn.nw_ecn;
1224         break;
1225
1226     case OFPUTIL_OFPAT11_SET_NW_TTL:
1227         ofpact_put_SET_IP_TTL(out)->ttl = a->nw_ttl.nw_ttl;
1228         break;
1229
1230     case OFPUTIL_OFPAT11_SET_TP_SRC:
1231         ofpact_put_SET_L4_SRC_PORT(out)->port = ntohs(a->tp_port.tp_port);
1232         break;
1233
1234     case OFPUTIL_OFPAT11_SET_TP_DST:
1235         ofpact_put_SET_L4_DST_PORT(out)->port = ntohs(a->tp_port.tp_port);
1236         break;
1237
1238     case OFPUTIL_OFPAT12_SET_FIELD:
1239         return set_field_from_openflow(&a->set_field, out);
1240
1241     case OFPUTIL_OFPAT11_SET_MPLS_LABEL:
1242         ofpact_put_SET_MPLS_LABEL(out)->label = a->ofp11_mpls_label.mpls_label;
1243         break;
1244
1245     case OFPUTIL_OFPAT11_SET_MPLS_TC:
1246         ofpact_put_SET_MPLS_TC(out)->tc = a->ofp11_mpls_tc.mpls_tc;
1247         break;
1248
1249     case OFPUTIL_OFPAT11_SET_MPLS_TTL:
1250         ofpact_put_SET_MPLS_TTL(out)->ttl = a->ofp11_mpls_ttl.mpls_ttl;
1251         break;
1252
1253     case OFPUTIL_OFPAT11_DEC_MPLS_TTL:
1254         ofpact_put_DEC_MPLS_TTL(out);
1255         break;
1256
1257     case OFPUTIL_OFPAT11_PUSH_MPLS:
1258         /* OpenFlow 1.3 has different semantics. */
1259         error = push_mpls_from_openflow(a->push.ethertype,
1260                                         version >= OFP13_VERSION ?
1261                                         OFPACT_MPLS_BEFORE_VLAN :
1262                                         OFPACT_MPLS_AFTER_VLAN, out);
1263         break;
1264
1265     case OFPUTIL_OFPAT11_POP_MPLS:
1266         if (eth_type_mpls(a->ofp11_pop_mpls.ethertype)) {
1267             return OFPERR_OFPBAC_BAD_ARGUMENT;
1268         }
1269         ofpact_put_POP_MPLS(out)->ethertype = a->ofp11_pop_mpls.ethertype;
1270         break;
1271
1272     case OFPUTIL_OFPAT11_GROUP:
1273         ofpact_put_GROUP(out)->group_id = ntohl(a->group.group_id);
1274         break;
1275
1276 #define NXAST_ACTION(ENUM, STRUCT, EXTENSIBLE, NAME) case OFPUTIL_##ENUM:
1277 #include "ofp-util.def"
1278         return ofpact_from_nxast(a, code, out);
1279     }
1280
1281     return error;
1282 }
1283
1284 /* True if an action sets the value of a field
1285  * in a way that is compatibile with the action set.
1286  * False otherwise. */
1287 static bool
1288 ofpact_is_set_action(const struct ofpact *a)
1289 {
1290     switch (a->type) {
1291     case OFPACT_SET_FIELD:
1292     case OFPACT_REG_LOAD:
1293     case OFPACT_SET_ETH_DST:
1294     case OFPACT_SET_ETH_SRC:
1295     case OFPACT_SET_IP_DSCP:
1296     case OFPACT_SET_IP_ECN:
1297     case OFPACT_SET_IP_TTL:
1298     case OFPACT_SET_IPV4_DST:
1299     case OFPACT_SET_IPV4_SRC:
1300     case OFPACT_SET_L4_DST_PORT:
1301     case OFPACT_SET_L4_SRC_PORT:
1302     case OFPACT_SET_MPLS_LABEL:
1303     case OFPACT_SET_MPLS_TC:
1304     case OFPACT_SET_MPLS_TTL:
1305     case OFPACT_SET_QUEUE:
1306     case OFPACT_SET_TUNNEL:
1307     case OFPACT_SET_VLAN_PCP:
1308     case OFPACT_SET_VLAN_VID:
1309         return true;
1310     case OFPACT_BUNDLE:
1311     case OFPACT_CLEAR_ACTIONS:
1312     case OFPACT_CONTROLLER:
1313     case OFPACT_DEC_MPLS_TTL:
1314     case OFPACT_DEC_TTL:
1315     case OFPACT_ENQUEUE:
1316     case OFPACT_EXIT:
1317     case OFPACT_FIN_TIMEOUT:
1318     case OFPACT_GOTO_TABLE:
1319     case OFPACT_GROUP:
1320     case OFPACT_LEARN:
1321     case OFPACT_METER:
1322     case OFPACT_MULTIPATH:
1323     case OFPACT_NOTE:
1324     case OFPACT_OUTPUT:
1325     case OFPACT_OUTPUT_REG:
1326     case OFPACT_POP_MPLS:
1327     case OFPACT_POP_QUEUE:
1328     case OFPACT_PUSH_MPLS:
1329     case OFPACT_PUSH_VLAN:
1330     case OFPACT_REG_MOVE:
1331     case OFPACT_RESUBMIT:
1332     case OFPACT_SAMPLE:
1333     case OFPACT_STACK_POP:
1334     case OFPACT_STACK_PUSH:
1335     case OFPACT_STRIP_VLAN:
1336     case OFPACT_WRITE_ACTIONS:
1337     case OFPACT_WRITE_METADATA:
1338         return false;
1339     default:
1340         NOT_REACHED();
1341     }
1342 }
1343
1344 /* True if an action is allowed in the action set.
1345  * False otherwise. */
1346 static bool
1347 ofpact_is_allowed_in_actions_set(const struct ofpact *a)
1348 {
1349     switch (a->type) {
1350     case OFPACT_DEC_MPLS_TTL:
1351     case OFPACT_DEC_TTL:
1352     case OFPACT_GROUP:
1353     case OFPACT_OUTPUT:
1354     case OFPACT_POP_MPLS:
1355     case OFPACT_PUSH_MPLS:
1356     case OFPACT_PUSH_VLAN:
1357     case OFPACT_REG_LOAD:
1358     case OFPACT_SET_FIELD:
1359     case OFPACT_SET_ETH_DST:
1360     case OFPACT_SET_ETH_SRC:
1361     case OFPACT_SET_IP_DSCP:
1362     case OFPACT_SET_IP_ECN:
1363     case OFPACT_SET_IP_TTL:
1364     case OFPACT_SET_IPV4_DST:
1365     case OFPACT_SET_IPV4_SRC:
1366     case OFPACT_SET_L4_DST_PORT:
1367     case OFPACT_SET_L4_SRC_PORT:
1368     case OFPACT_SET_MPLS_LABEL:
1369     case OFPACT_SET_MPLS_TC:
1370     case OFPACT_SET_MPLS_TTL:
1371     case OFPACT_SET_QUEUE:
1372     case OFPACT_SET_TUNNEL:
1373     case OFPACT_SET_VLAN_PCP:
1374     case OFPACT_SET_VLAN_VID:
1375     case OFPACT_STRIP_VLAN:
1376         return true;
1377
1378     /* In general these actions are excluded because they are not part of
1379      * the OpenFlow specification nor map to actions that are defined in
1380      * the specification.  Thus the order in which they should be applied
1381      * in the action set is undefined. */
1382     case OFPACT_BUNDLE:
1383     case OFPACT_CONTROLLER:
1384     case OFPACT_ENQUEUE:
1385     case OFPACT_EXIT:
1386     case OFPACT_FIN_TIMEOUT:
1387     case OFPACT_LEARN:
1388     case OFPACT_MULTIPATH:
1389     case OFPACT_NOTE:
1390     case OFPACT_OUTPUT_REG:
1391     case OFPACT_POP_QUEUE:
1392     case OFPACT_REG_MOVE:
1393     case OFPACT_RESUBMIT:
1394     case OFPACT_SAMPLE:
1395     case OFPACT_STACK_POP:
1396     case OFPACT_STACK_PUSH:
1397
1398     /* The action set may only include actions and thus
1399      * may not include any instructions */
1400     case OFPACT_CLEAR_ACTIONS:
1401     case OFPACT_GOTO_TABLE:
1402     case OFPACT_METER:
1403     case OFPACT_WRITE_ACTIONS:
1404     case OFPACT_WRITE_METADATA:
1405         return false;
1406     default:
1407         NOT_REACHED();
1408     }
1409 }
1410
1411 /* Append ofpact 'a' onto the tail of 'out' */
1412 static void
1413 ofpact_copy(struct ofpbuf *out, const struct ofpact *a)
1414 {
1415     ofpbuf_put(out, a, OFPACT_ALIGN(a->len));
1416 }
1417
1418 /* Copies the last ofpact whose type is 'filter' from 'in' to 'out'. */
1419 static bool
1420 ofpacts_copy_last(struct ofpbuf *out, const struct ofpbuf *in,
1421                   enum ofpact_type filter)
1422 {
1423     const struct ofpact *target;
1424     const struct ofpact *a;
1425
1426     target = NULL;
1427     OFPACT_FOR_EACH (a, in->data, in->size) {
1428         if (a->type == filter) {
1429             target = a;
1430         }
1431     }
1432     if (target) {
1433         ofpact_copy(out, target);
1434     }
1435     return target != NULL;
1436 }
1437
1438 /* Append all ofpacts, for which 'filter' returns true, from 'in' to 'out'.
1439  * The order of appended ofpacts is preserved between 'in' and 'out' */
1440 static void
1441 ofpacts_copy_all(struct ofpbuf *out, const struct ofpbuf *in,
1442                  bool (*filter)(const struct ofpact *))
1443 {
1444     const struct ofpact *a;
1445
1446     OFPACT_FOR_EACH (a, in->data, in->size) {
1447         if (filter(a)) {
1448             ofpact_copy(out, a);
1449         }
1450     }
1451 }
1452
1453 /* Reads 'action_set', which contains ofpacts accumulated by
1454  * OFPACT_WRITE_ACTIONS instructions, and writes equivalent actions to be
1455  * executed directly into 'action_list'.  (These names correspond to the
1456  * "Action Set" and "Action List" terms used in OpenFlow 1.1+.)
1457  *
1458  * In general this involves appending the last instance of each action that is
1459  * adimissible in the action set in the order described in the OpenFlow
1460  * specification.
1461  *
1462  * Exceptions:
1463  * + output action is only appended if no group action was present in 'in'.
1464  * + As a simplification all set actions are copied in the order the are
1465  *   provided in 'in' as many set actions applied to a field has the same
1466  *   affect as only applying the last action that sets a field and
1467  *   duplicates are removed by do_xlate_actions().
1468  *   This has an unwanted side-effect of compsoting multiple
1469  *   LOAD_REG actions that touch different regions of the same field. */
1470 void
1471 ofpacts_execute_action_set(struct ofpbuf *action_list,
1472                            const struct ofpbuf *action_set)
1473 {
1474     /* The OpenFlow spec "Action Set" section specifies this order. */
1475     ofpacts_copy_last(action_list, action_set, OFPACT_STRIP_VLAN);
1476     ofpacts_copy_last(action_list, action_set, OFPACT_POP_MPLS);
1477     ofpacts_copy_last(action_list, action_set, OFPACT_PUSH_MPLS);
1478     ofpacts_copy_last(action_list, action_set, OFPACT_PUSH_VLAN);
1479     ofpacts_copy_last(action_list, action_set, OFPACT_DEC_TTL);
1480     ofpacts_copy_last(action_list, action_set, OFPACT_DEC_MPLS_TTL);
1481     ofpacts_copy_all(action_list, action_set, ofpact_is_set_action);
1482     ofpacts_copy_last(action_list, action_set, OFPACT_SET_QUEUE);
1483
1484     /* If both OFPACT_GROUP and OFPACT_OUTPUT are present, OpenFlow says that
1485      * we should execute only OFPACT_GROUP.
1486      *
1487      * If neither OFPACT_GROUP nor OFPACT_OUTPUT is present, then we can drop
1488      * all the actions because there's no point in modifying a packet that will
1489      * not be sent anywhere. */
1490     if (!ofpacts_copy_last(action_list, action_set, OFPACT_GROUP) &&
1491         !ofpacts_copy_last(action_list, action_set, OFPACT_OUTPUT)) {
1492         ofpbuf_clear(action_list);
1493     }
1494 }
1495
1496
1497 static enum ofperr
1498 ofpacts_from_openflow11_for_action_set(const union ofp_action *in,
1499                                        size_t n_in, enum ofp_version version,
1500                                        struct ofpbuf *out)
1501 {
1502     enum ofperr error;
1503     struct ofpact *a;
1504     size_t start = out->size;
1505
1506     error = ofpacts_from_openflow(in, n_in, version, out);
1507
1508     if (error) {
1509         return error;
1510     }
1511
1512     OFPACT_FOR_EACH (a, ofpact_end(out->data, start), out->size - start) {
1513         if (!ofpact_is_allowed_in_actions_set(a)) {
1514             VLOG_WARN_RL(&rl, "disallowed action in action set");
1515             return OFPERR_OFPBAC_BAD_TYPE;
1516         }
1517     }
1518
1519     return 0;
1520 }
1521
1522 \f
1523 /* OpenFlow 1.1 instructions. */
1524
1525 #define DEFINE_INST(ENUM, STRUCT, EXTENSIBLE, NAME)             \
1526     static inline const struct STRUCT * OVS_UNUSED              \
1527     instruction_get_##ENUM(const struct ofp11_instruction *inst)\
1528     {                                                           \
1529         ovs_assert(inst->type == htons(ENUM));                  \
1530         return ALIGNED_CAST(struct STRUCT *, inst);             \
1531     }                                                           \
1532                                                                 \
1533     static inline void OVS_UNUSED                               \
1534     instruction_init_##ENUM(struct STRUCT *s)                   \
1535     {                                                           \
1536         memset(s, 0, sizeof *s);                                \
1537         s->type = htons(ENUM);                                  \
1538         s->len = htons(sizeof *s);                              \
1539     }                                                           \
1540                                                                 \
1541     static inline struct STRUCT * OVS_UNUSED                    \
1542     instruction_put_##ENUM(struct ofpbuf *buf)                  \
1543     {                                                           \
1544         struct STRUCT *s = ofpbuf_put_uninit(buf, sizeof *s);   \
1545         instruction_init_##ENUM(s);                             \
1546         return s;                                               \
1547     }
1548 OVS_INSTRUCTIONS
1549 #undef DEFINE_INST
1550
1551 struct instruction_type_info {
1552     enum ovs_instruction_type type;
1553     const char *name;
1554 };
1555
1556 static const struct instruction_type_info inst_info[] = {
1557 #define DEFINE_INST(ENUM, STRUCT, EXTENSIBLE, NAME)    {OVSINST_##ENUM, NAME},
1558 OVS_INSTRUCTIONS
1559 #undef DEFINE_INST
1560 };
1561
1562 const char *
1563 ovs_instruction_name_from_type(enum ovs_instruction_type type)
1564 {
1565     return inst_info[type].name;
1566 }
1567
1568 int
1569 ovs_instruction_type_from_name(const char *name)
1570 {
1571     const struct instruction_type_info *p;
1572     for (p = inst_info; p < &inst_info[ARRAY_SIZE(inst_info)]; p++) {
1573         if (!strcasecmp(name, p->name)) {
1574             return p->type;
1575         }
1576     }
1577     return -1;
1578 }
1579
1580 enum ovs_instruction_type
1581 ovs_instruction_type_from_ofpact_type(enum ofpact_type type)
1582 {
1583     switch (type) {
1584     case OFPACT_METER:
1585         return OVSINST_OFPIT13_METER;
1586     case OFPACT_CLEAR_ACTIONS:
1587         return OVSINST_OFPIT11_CLEAR_ACTIONS;
1588     case OFPACT_WRITE_ACTIONS:
1589         return OVSINST_OFPIT11_WRITE_ACTIONS;
1590     case OFPACT_WRITE_METADATA:
1591         return OVSINST_OFPIT11_WRITE_METADATA;
1592     case OFPACT_GOTO_TABLE:
1593         return OVSINST_OFPIT11_GOTO_TABLE;
1594     case OFPACT_OUTPUT:
1595     case OFPACT_GROUP:
1596     case OFPACT_CONTROLLER:
1597     case OFPACT_ENQUEUE:
1598     case OFPACT_OUTPUT_REG:
1599     case OFPACT_BUNDLE:
1600     case OFPACT_SET_VLAN_VID:
1601     case OFPACT_SET_VLAN_PCP:
1602     case OFPACT_STRIP_VLAN:
1603     case OFPACT_PUSH_VLAN:
1604     case OFPACT_SET_ETH_SRC:
1605     case OFPACT_SET_ETH_DST:
1606     case OFPACT_SET_IPV4_SRC:
1607     case OFPACT_SET_IPV4_DST:
1608     case OFPACT_SET_IP_DSCP:
1609     case OFPACT_SET_IP_ECN:
1610     case OFPACT_SET_IP_TTL:
1611     case OFPACT_SET_L4_SRC_PORT:
1612     case OFPACT_SET_L4_DST_PORT:
1613     case OFPACT_REG_MOVE:
1614     case OFPACT_REG_LOAD:
1615     case OFPACT_SET_FIELD:
1616     case OFPACT_STACK_PUSH:
1617     case OFPACT_STACK_POP:
1618     case OFPACT_DEC_TTL:
1619     case OFPACT_SET_MPLS_LABEL:
1620     case OFPACT_SET_MPLS_TC:
1621     case OFPACT_SET_MPLS_TTL:
1622     case OFPACT_DEC_MPLS_TTL:
1623     case OFPACT_PUSH_MPLS:
1624     case OFPACT_POP_MPLS:
1625     case OFPACT_SET_TUNNEL:
1626     case OFPACT_SET_QUEUE:
1627     case OFPACT_POP_QUEUE:
1628     case OFPACT_FIN_TIMEOUT:
1629     case OFPACT_RESUBMIT:
1630     case OFPACT_LEARN:
1631     case OFPACT_MULTIPATH:
1632     case OFPACT_NOTE:
1633     case OFPACT_EXIT:
1634     case OFPACT_SAMPLE:
1635     default:
1636         return OVSINST_OFPIT11_APPLY_ACTIONS;
1637     }
1638 }
1639
1640 static inline struct ofp11_instruction *
1641 instruction_next(const struct ofp11_instruction *inst)
1642 {
1643     return ((struct ofp11_instruction *) (void *)
1644             ((uint8_t *) inst + ntohs(inst->len)));
1645 }
1646
1647 static inline bool
1648 instruction_is_valid(const struct ofp11_instruction *inst,
1649                      size_t n_instructions)
1650 {
1651     uint16_t len = ntohs(inst->len);
1652     return (!(len % OFP11_INSTRUCTION_ALIGN)
1653             && len >= sizeof *inst
1654             && len / sizeof *inst <= n_instructions);
1655 }
1656
1657 /* This macro is careful to check for instructions with bad lengths. */
1658 #define INSTRUCTION_FOR_EACH(ITER, LEFT, INSTRUCTIONS, N_INSTRUCTIONS)  \
1659     for ((ITER) = (INSTRUCTIONS), (LEFT) = (N_INSTRUCTIONS);            \
1660          (LEFT) > 0 && instruction_is_valid(ITER, LEFT);                \
1661          ((LEFT) -= (ntohs((ITER)->len)                                 \
1662                      / sizeof(struct ofp11_instruction)),               \
1663           (ITER) = instruction_next(ITER)))
1664
1665 static enum ofperr
1666 decode_openflow11_instruction(const struct ofp11_instruction *inst,
1667                               enum ovs_instruction_type *type)
1668 {
1669     uint16_t len = ntohs(inst->len);
1670
1671     switch (inst->type) {
1672     case CONSTANT_HTONS(OFPIT11_EXPERIMENTER):
1673         return OFPERR_OFPBIC_BAD_EXPERIMENTER;
1674
1675 #define DEFINE_INST(ENUM, STRUCT, EXTENSIBLE, NAME)     \
1676         case CONSTANT_HTONS(ENUM):                      \
1677             if (EXTENSIBLE                              \
1678                 ? len >= sizeof(struct STRUCT)          \
1679                 : len == sizeof(struct STRUCT)) {       \
1680                 *type = OVSINST_##ENUM;                 \
1681                 return 0;                               \
1682             } else {                                    \
1683                 return OFPERR_OFPBIC_BAD_LEN;           \
1684             }
1685 OVS_INSTRUCTIONS
1686 #undef DEFINE_INST
1687
1688     default:
1689         return OFPERR_OFPBIC_UNKNOWN_INST;
1690     }
1691 }
1692
1693 static enum ofperr
1694 decode_openflow11_instructions(const struct ofp11_instruction insts[],
1695                                size_t n_insts,
1696                                const struct ofp11_instruction *out[])
1697 {
1698     const struct ofp11_instruction *inst;
1699     size_t left;
1700
1701     memset(out, 0, N_OVS_INSTRUCTIONS * sizeof *out);
1702     INSTRUCTION_FOR_EACH (inst, left, insts, n_insts) {
1703         enum ovs_instruction_type type;
1704         enum ofperr error;
1705
1706         error = decode_openflow11_instruction(inst, &type);
1707         if (error) {
1708             return error;
1709         }
1710
1711         if (out[type]) {
1712             return OFPERR_ONFBIC_DUP_INSTRUCTION;
1713         }
1714         out[type] = inst;
1715     }
1716
1717     if (left) {
1718         VLOG_WARN_RL(&rl, "bad instruction format at offset %zu",
1719                      (n_insts - left) * sizeof *inst);
1720         return OFPERR_OFPBIC_BAD_LEN;
1721     }
1722     return 0;
1723 }
1724
1725 static void
1726 get_actions_from_instruction(const struct ofp11_instruction *inst,
1727                              const union ofp_action **actions,
1728                              size_t *max_actions)
1729 {
1730     *actions = ALIGNED_CAST(const union ofp_action *, inst + 1);
1731     *max_actions = (ntohs(inst->len) - sizeof *inst) / OFP11_INSTRUCTION_ALIGN;
1732 }
1733
1734 enum ofperr
1735 ofpacts_pull_openflow_instructions(struct ofpbuf *openflow,
1736                                    unsigned int instructions_len,
1737                                    enum ofp_version version,
1738                                    struct ofpbuf *ofpacts)
1739 {
1740     const struct ofp11_instruction *instructions;
1741     const struct ofp11_instruction *insts[N_OVS_INSTRUCTIONS];
1742     enum ofperr error;
1743
1744     ofpbuf_clear(ofpacts);
1745
1746     if (instructions_len % OFP11_INSTRUCTION_ALIGN != 0) {
1747         VLOG_WARN_RL(&rl, "OpenFlow message instructions length %u is not a "
1748                      "multiple of %d",
1749                      instructions_len, OFP11_INSTRUCTION_ALIGN);
1750         error = OFPERR_OFPBIC_BAD_LEN;
1751         goto exit;
1752     }
1753
1754     instructions = ofpbuf_try_pull(openflow, instructions_len);
1755     if (instructions == NULL) {
1756         VLOG_WARN_RL(&rl, "OpenFlow message instructions length %u exceeds "
1757                      "remaining message length (%zu)",
1758                      instructions_len, openflow->size);
1759         error = OFPERR_OFPBIC_BAD_LEN;
1760         goto exit;
1761     }
1762
1763     error = decode_openflow11_instructions(
1764         instructions, instructions_len / OFP11_INSTRUCTION_ALIGN,
1765         insts);
1766     if (error) {
1767         goto exit;
1768     }
1769
1770     if (insts[OVSINST_OFPIT13_METER]) {
1771         const struct ofp13_instruction_meter *oim;
1772         struct ofpact_meter *om;
1773
1774         oim = ALIGNED_CAST(const struct ofp13_instruction_meter *,
1775                            insts[OVSINST_OFPIT13_METER]);
1776
1777         om = ofpact_put_METER(ofpacts);
1778         om->meter_id = ntohl(oim->meter_id);
1779     }
1780     if (insts[OVSINST_OFPIT11_APPLY_ACTIONS]) {
1781         const union ofp_action *actions;
1782         size_t max_actions;
1783
1784         get_actions_from_instruction(insts[OVSINST_OFPIT11_APPLY_ACTIONS],
1785                                      &actions, &max_actions);
1786         error = ofpacts_from_openflow(actions, max_actions, version, ofpacts);
1787         if (error) {
1788             goto exit;
1789         }
1790     }
1791     if (insts[OVSINST_OFPIT11_CLEAR_ACTIONS]) {
1792         instruction_get_OFPIT11_CLEAR_ACTIONS(
1793             insts[OVSINST_OFPIT11_CLEAR_ACTIONS]);
1794         ofpact_put_CLEAR_ACTIONS(ofpacts);
1795     }
1796     if (insts[OVSINST_OFPIT11_WRITE_ACTIONS]) {
1797         struct ofpact_nest *on;
1798         const union ofp_action *actions;
1799         size_t max_actions;
1800         size_t start;
1801
1802         ofpact_pad(ofpacts);
1803         start = ofpacts->size;
1804         on = ofpact_put(ofpacts, OFPACT_WRITE_ACTIONS,
1805                         offsetof(struct ofpact_nest, actions));
1806         get_actions_from_instruction(insts[OVSINST_OFPIT11_WRITE_ACTIONS],
1807                                      &actions, &max_actions);
1808         error = ofpacts_from_openflow11_for_action_set(actions, max_actions,
1809                                                        version, ofpacts);
1810         if (error) {
1811             goto exit;
1812         }
1813         on = ofpbuf_at_assert(ofpacts, start, sizeof *on);
1814         on->ofpact.len = ofpacts->size - start;
1815     }
1816     if (insts[OVSINST_OFPIT11_WRITE_METADATA]) {
1817         const struct ofp11_instruction_write_metadata *oiwm;
1818         struct ofpact_metadata *om;
1819
1820         oiwm = ALIGNED_CAST(const struct ofp11_instruction_write_metadata *,
1821                             insts[OVSINST_OFPIT11_WRITE_METADATA]);
1822
1823         om = ofpact_put_WRITE_METADATA(ofpacts);
1824         om->metadata = oiwm->metadata;
1825         om->mask = oiwm->metadata_mask;
1826     }
1827     if (insts[OVSINST_OFPIT11_GOTO_TABLE]) {
1828         const struct ofp11_instruction_goto_table *oigt;
1829         struct ofpact_goto_table *ogt;
1830
1831         oigt = instruction_get_OFPIT11_GOTO_TABLE(
1832             insts[OVSINST_OFPIT11_GOTO_TABLE]);
1833         ogt = ofpact_put_GOTO_TABLE(ofpacts);
1834         ogt->table_id = oigt->table_id;
1835     }
1836
1837     error = ofpacts_verify(ofpacts->data, ofpacts->size);
1838 exit:
1839     if (error) {
1840         ofpbuf_clear(ofpacts);
1841     }
1842     return error;
1843 }
1844 \f
1845 /* Checks that 'port' is a valid output port for OFPACT_OUTPUT, given that the
1846  * switch will never have more than 'max_ports' ports.  Returns 0 if 'port' is
1847  * valid, otherwise an OpenFlow error code. */
1848 enum ofperr
1849 ofpact_check_output_port(ofp_port_t port, ofp_port_t max_ports)
1850 {
1851     switch (port) {
1852     case OFPP_IN_PORT:
1853     case OFPP_TABLE:
1854     case OFPP_NORMAL:
1855     case OFPP_FLOOD:
1856     case OFPP_ALL:
1857     case OFPP_CONTROLLER:
1858     case OFPP_NONE:
1859     case OFPP_LOCAL:
1860         return 0;
1861
1862     default:
1863         if (ofp_to_u16(port) < ofp_to_u16(max_ports)) {
1864             return 0;
1865         }
1866         return OFPERR_OFPBAC_BAD_OUT_PORT;
1867     }
1868 }
1869
1870 /* May modify flow->dl_type, flow->nw_proto and flow->vlan_tci,
1871  * caller must restore them.
1872  *
1873  * Modifies some actions, filling in fields that could not be properly set
1874  * without context. */
1875 static enum ofperr
1876 ofpact_check__(struct ofpact *a, struct flow *flow,
1877                bool enforce_consistency, ofp_port_t max_ports,
1878                uint8_t table_id, uint8_t n_tables)
1879 {
1880     const struct ofpact_enqueue *enqueue;
1881     const struct mf_field *mf;
1882
1883     switch (a->type) {
1884     case OFPACT_OUTPUT:
1885         return ofpact_check_output_port(ofpact_get_OUTPUT(a)->port,
1886                                         max_ports);
1887
1888     case OFPACT_CONTROLLER:
1889         return 0;
1890
1891     case OFPACT_ENQUEUE:
1892         enqueue = ofpact_get_ENQUEUE(a);
1893         if (ofp_to_u16(enqueue->port) >= ofp_to_u16(max_ports)
1894             && enqueue->port != OFPP_IN_PORT
1895             && enqueue->port != OFPP_LOCAL) {
1896             return OFPERR_OFPBAC_BAD_OUT_PORT;
1897         }
1898         return 0;
1899
1900     case OFPACT_OUTPUT_REG:
1901         return mf_check_src(&ofpact_get_OUTPUT_REG(a)->src, flow);
1902
1903     case OFPACT_BUNDLE:
1904         return bundle_check(ofpact_get_BUNDLE(a), max_ports, flow);
1905
1906     case OFPACT_SET_VLAN_VID:
1907         /* Remember if we saw a vlan tag in the flow to aid translating to
1908          * OpenFlow 1.1+ if need be. */
1909         ofpact_get_SET_VLAN_VID(a)->flow_has_vlan =
1910             (flow->vlan_tci & htons(VLAN_CFI)) == htons(VLAN_CFI);
1911         if (!(flow->vlan_tci & htons(VLAN_CFI)) &&
1912             !ofpact_get_SET_VLAN_VID(a)->push_vlan_if_needed) {
1913             goto inconsistent;
1914         }
1915         /* Temporary mark that we have a vlan tag. */
1916         flow->vlan_tci |= htons(VLAN_CFI);
1917         return 0;
1918
1919     case OFPACT_SET_VLAN_PCP:
1920         /* Remember if we saw a vlan tag in the flow to aid translating to
1921          * OpenFlow 1.1+ if need be. */
1922         ofpact_get_SET_VLAN_PCP(a)->flow_has_vlan =
1923             (flow->vlan_tci & htons(VLAN_CFI)) == htons(VLAN_CFI);
1924         if (!(flow->vlan_tci & htons(VLAN_CFI)) &&
1925             !ofpact_get_SET_VLAN_PCP(a)->push_vlan_if_needed) {
1926             goto inconsistent;
1927         }
1928         /* Temporary mark that we have a vlan tag. */
1929         flow->vlan_tci |= htons(VLAN_CFI);
1930         return 0;
1931
1932     case OFPACT_STRIP_VLAN:
1933         if (!(flow->vlan_tci & htons(VLAN_CFI))) {
1934             goto inconsistent;
1935         }
1936         /* Temporary mark that we have no vlan tag. */
1937         flow->vlan_tci = htons(0);
1938         return 0;
1939
1940     case OFPACT_PUSH_VLAN:
1941         if (flow->vlan_tci & htons(VLAN_CFI)) {
1942             /* Multiple VLAN headers not supported. */
1943             return OFPERR_OFPBAC_BAD_TAG;
1944         }
1945         /* Temporary mark that we have a vlan tag. */
1946         flow->vlan_tci |= htons(VLAN_CFI);
1947         return 0;
1948
1949     case OFPACT_SET_ETH_SRC:
1950     case OFPACT_SET_ETH_DST:
1951         return 0;
1952
1953     case OFPACT_SET_IPV4_SRC:
1954     case OFPACT_SET_IPV4_DST:
1955         if (flow->dl_type != htons(ETH_TYPE_IP)) {
1956             goto inconsistent;
1957         }
1958         return 0;
1959
1960     case OFPACT_SET_IP_DSCP:
1961     case OFPACT_SET_IP_ECN:
1962     case OFPACT_SET_IP_TTL:
1963     case OFPACT_DEC_TTL:
1964         if (!is_ip_any(flow)) {
1965             goto inconsistent;
1966         }
1967         return 0;
1968
1969     case OFPACT_SET_L4_SRC_PORT:
1970         if (!is_ip_any(flow) ||
1971             (flow->nw_proto != IPPROTO_TCP && flow->nw_proto != IPPROTO_UDP
1972              && flow->nw_proto != IPPROTO_SCTP)) {
1973             goto inconsistent;
1974         }
1975         /* Note on which transport protocol the port numbers are set.
1976          * This allows this set action to be converted to an OF1.2 set field
1977          * action. */
1978         ofpact_get_SET_L4_SRC_PORT(a)->flow_ip_proto = flow->nw_proto;
1979         return 0;
1980
1981     case OFPACT_SET_L4_DST_PORT:
1982         if (!is_ip_any(flow) ||
1983             (flow->nw_proto != IPPROTO_TCP && flow->nw_proto != IPPROTO_UDP
1984              && flow->nw_proto != IPPROTO_SCTP)) {
1985             goto inconsistent;
1986         }
1987         /* Note on which transport protocol the port numbers are set.
1988          * This allows this set action to be converted to an OF1.2 set field
1989          * action. */
1990         ofpact_get_SET_L4_DST_PORT(a)->flow_ip_proto = flow->nw_proto;
1991         return 0;
1992
1993     case OFPACT_REG_MOVE:
1994         return nxm_reg_move_check(ofpact_get_REG_MOVE(a), flow);
1995
1996     case OFPACT_REG_LOAD:
1997         return nxm_reg_load_check(ofpact_get_REG_LOAD(a), flow);
1998
1999     case OFPACT_SET_FIELD:
2000         mf = ofpact_get_SET_FIELD(a)->field;
2001         /* Require OXM_OF_VLAN_VID to have an existing VLAN header. */
2002         if (!mf_are_prereqs_ok(mf, flow) ||
2003             (mf->id == MFF_VLAN_VID && !(flow->vlan_tci & htons(VLAN_CFI)))) {
2004             VLOG_WARN_RL(&rl, "set_field %s lacks correct prerequisities",
2005                          mf->name);
2006             return OFPERR_OFPBAC_MATCH_INCONSISTENT;
2007         }
2008         /* Remember if we saw a vlan tag in the flow to aid translating to
2009          * OpenFlow 1.1 if need be. */
2010         ofpact_get_SET_FIELD(a)->flow_has_vlan =
2011             (flow->vlan_tci & htons(VLAN_CFI)) == htons(VLAN_CFI);
2012         if (mf->id == MFF_VLAN_TCI) {
2013             /* The set field may add or remove the vlan tag,
2014              * Mark the status temporarily. */
2015             flow->vlan_tci = ofpact_get_SET_FIELD(a)->value.be16;
2016         }
2017         return 0;
2018
2019     case OFPACT_STACK_PUSH:
2020         return nxm_stack_push_check(ofpact_get_STACK_PUSH(a), flow);
2021
2022     case OFPACT_STACK_POP:
2023         return nxm_stack_pop_check(ofpact_get_STACK_POP(a), flow);
2024
2025     case OFPACT_SET_MPLS_LABEL:
2026     case OFPACT_SET_MPLS_TC:
2027     case OFPACT_SET_MPLS_TTL:
2028     case OFPACT_DEC_MPLS_TTL:
2029         if (!eth_type_mpls(flow->dl_type)) {
2030             goto inconsistent;
2031         }
2032         return 0;
2033
2034     case OFPACT_SET_TUNNEL:
2035     case OFPACT_SET_QUEUE:
2036     case OFPACT_POP_QUEUE:
2037     case OFPACT_RESUBMIT:
2038         return 0;
2039
2040     case OFPACT_FIN_TIMEOUT:
2041         if (flow->nw_proto != IPPROTO_TCP) {
2042             goto inconsistent;
2043         }
2044         return 0;
2045
2046     case OFPACT_LEARN:
2047         return learn_check(ofpact_get_LEARN(a), flow);
2048
2049     case OFPACT_MULTIPATH:
2050         return multipath_check(ofpact_get_MULTIPATH(a), flow);
2051
2052     case OFPACT_NOTE:
2053     case OFPACT_EXIT:
2054         return 0;
2055
2056     case OFPACT_PUSH_MPLS:
2057         flow->dl_type = ofpact_get_PUSH_MPLS(a)->ethertype;
2058         /* The packet is now MPLS and the MPLS payload is opaque.
2059          * Thus nothing can be assumed about the network protocol.
2060          * Temporarily mark that we have no nw_proto. */
2061         flow->nw_proto = 0;
2062         return 0;
2063
2064     case OFPACT_POP_MPLS:
2065         flow->dl_type = ofpact_get_POP_MPLS(a)->ethertype;
2066         if (!eth_type_mpls(flow->dl_type)) {
2067             goto inconsistent;
2068         }
2069         return 0;
2070
2071     case OFPACT_SAMPLE:
2072         return 0;
2073
2074     case OFPACT_CLEAR_ACTIONS:
2075         return 0;
2076
2077     case OFPACT_WRITE_ACTIONS: {
2078         struct ofpact_nest *on = ofpact_get_WRITE_ACTIONS(a);
2079         return ofpacts_check(on->actions, ofpact_nest_get_action_len(on),
2080                              flow, false, max_ports, table_id, n_tables);
2081     }
2082
2083     case OFPACT_WRITE_METADATA:
2084         return 0;
2085
2086     case OFPACT_METER: {
2087         uint32_t mid = ofpact_get_METER(a)->meter_id;
2088         if (mid == 0 || mid > OFPM13_MAX) {
2089             return OFPERR_OFPMMFC_INVALID_METER;
2090         }
2091         return 0;
2092     }
2093
2094     case OFPACT_GOTO_TABLE: {
2095         uint8_t goto_table = ofpact_get_GOTO_TABLE(a)->table_id;
2096         if ((table_id != 255 && goto_table <= table_id)
2097             || (n_tables != 255 && goto_table >= n_tables)) {
2098             return OFPERR_OFPBRC_BAD_TABLE_ID;
2099         }
2100         return 0;
2101     }
2102
2103     case OFPACT_GROUP:
2104         return 0;
2105
2106     default:
2107         NOT_REACHED();
2108     }
2109
2110  inconsistent:
2111     if (enforce_consistency) {
2112         return OFPERR_OFPBAC_MATCH_INCONSISTENT;
2113     }
2114     return 0;
2115 }
2116
2117 /* Checks that the 'ofpacts_len' bytes of actions in 'ofpacts' are
2118  * appropriate for a packet with the prerequisites satisfied by 'flow' in a
2119  * switch with no more than 'max_ports' ports.
2120  *
2121  * May annotate ofpacts with information gathered from the 'flow'.
2122  *
2123  * May temporarily modify 'flow', but restores the changes before returning. */
2124 enum ofperr
2125 ofpacts_check(struct ofpact ofpacts[], size_t ofpacts_len,
2126               struct flow *flow, bool enforce_consistency,
2127               ofp_port_t max_ports,
2128               uint8_t table_id, uint8_t n_tables)
2129 {
2130     struct ofpact *a;
2131     ovs_be16 dl_type = flow->dl_type;
2132     ovs_be16 vlan_tci = flow->vlan_tci;
2133     uint8_t nw_proto = flow->nw_proto;
2134     enum ofperr error = 0;
2135
2136     OFPACT_FOR_EACH (a, ofpacts, ofpacts_len) {
2137         error = ofpact_check__(a, flow, enforce_consistency,
2138                                max_ports, table_id, n_tables);
2139         if (error) {
2140             break;
2141         }
2142     }
2143     /* Restore fields that may have been modified. */
2144     flow->dl_type = dl_type;
2145     flow->vlan_tci = vlan_tci;
2146     flow->nw_proto = nw_proto;
2147     return error;
2148 }
2149
2150 /* Verifies that the 'ofpacts_len' bytes of actions in 'ofpacts' are
2151  * in the appropriate order as defined by the OpenFlow spec. */
2152 enum ofperr
2153 ofpacts_verify(const struct ofpact ofpacts[], size_t ofpacts_len)
2154 {
2155     const struct ofpact *a;
2156     enum ovs_instruction_type inst;
2157
2158     inst = OVSINST_OFPIT13_METER;
2159     OFPACT_FOR_EACH (a, ofpacts, ofpacts_len) {
2160         enum ovs_instruction_type next;
2161
2162         next = ovs_instruction_type_from_ofpact_type(a->type);
2163         if (a > ofpacts
2164             && (inst == OVSINST_OFPIT11_APPLY_ACTIONS
2165                 ? next < inst
2166                 : next <= inst)) {
2167             const char *name = ovs_instruction_name_from_type(inst);
2168             const char *next_name = ovs_instruction_name_from_type(next);
2169
2170             if (next == inst) {
2171                 VLOG_WARN("duplicate %s instruction not allowed, for OpenFlow "
2172                           "1.1+ compatibility", name);
2173             } else {
2174                 VLOG_WARN("invalid instruction ordering: %s must appear "
2175                           "before %s, for OpenFlow 1.1+ compatibility",
2176                           next_name, name);
2177             }
2178             return OFPERR_OFPBAC_UNSUPPORTED_ORDER;
2179         }
2180
2181         inst = next;
2182     }
2183
2184     return 0;
2185 }
2186 \f
2187 /* Converting ofpacts to Nicira OpenFlow extensions. */
2188
2189 static void
2190 ofpact_output_reg_to_nxast(const struct ofpact_output_reg *output_reg,
2191                                 struct ofpbuf *out)
2192 {
2193     struct nx_action_output_reg *naor = ofputil_put_NXAST_OUTPUT_REG(out);
2194
2195     naor->ofs_nbits = nxm_encode_ofs_nbits(output_reg->src.ofs,
2196                                            output_reg->src.n_bits);
2197     naor->src = htonl(output_reg->src.field->nxm_header);
2198     naor->max_len = htons(output_reg->max_len);
2199 }
2200
2201 static void
2202 ofpact_resubmit_to_nxast(const struct ofpact_resubmit *resubmit,
2203                          struct ofpbuf *out)
2204 {
2205     struct nx_action_resubmit *nar;
2206
2207     if (resubmit->table_id == 0xff
2208         && resubmit->ofpact.compat != OFPUTIL_NXAST_RESUBMIT_TABLE) {
2209         nar = ofputil_put_NXAST_RESUBMIT(out);
2210     } else {
2211         nar = ofputil_put_NXAST_RESUBMIT_TABLE(out);
2212         nar->table = resubmit->table_id;
2213     }
2214     nar->in_port = htons(ofp_to_u16(resubmit->in_port));
2215 }
2216
2217 static void
2218 ofpact_set_tunnel_to_nxast(const struct ofpact_tunnel *tunnel,
2219                            struct ofpbuf *out)
2220 {
2221     uint64_t tun_id = tunnel->tun_id;
2222
2223     if (tun_id <= UINT32_MAX
2224         && tunnel->ofpact.compat != OFPUTIL_NXAST_SET_TUNNEL64) {
2225         ofputil_put_NXAST_SET_TUNNEL(out)->tun_id = htonl(tun_id);
2226     } else {
2227         ofputil_put_NXAST_SET_TUNNEL64(out)->tun_id = htonll(tun_id);
2228     }
2229 }
2230
2231 static void
2232 ofpact_write_metadata_to_nxast(const struct ofpact_metadata *om,
2233                                struct ofpbuf *out)
2234 {
2235     struct nx_action_write_metadata *nawm;
2236
2237     nawm = ofputil_put_NXAST_WRITE_METADATA(out);
2238     nawm->metadata = om->metadata;
2239     nawm->mask = om->mask;
2240 }
2241
2242 static void
2243 ofpact_note_to_nxast(const struct ofpact_note *note, struct ofpbuf *out)
2244 {
2245     size_t start_ofs = out->size;
2246     struct nx_action_note *nan;
2247     unsigned int remainder;
2248     unsigned int len;
2249
2250     nan = ofputil_put_NXAST_NOTE(out);
2251     out->size -= sizeof nan->note;
2252
2253     ofpbuf_put(out, note->data, note->length);
2254
2255     len = out->size - start_ofs;
2256     remainder = len % OFP_ACTION_ALIGN;
2257     if (remainder) {
2258         ofpbuf_put_zeros(out, OFP_ACTION_ALIGN - remainder);
2259     }
2260     nan = ofpbuf_at(out, start_ofs, sizeof *nan);
2261     nan->len = htons(out->size - start_ofs);
2262 }
2263
2264 static void
2265 ofpact_controller_to_nxast(const struct ofpact_controller *oc,
2266                            struct ofpbuf *out)
2267 {
2268     struct nx_action_controller *nac;
2269
2270     nac = ofputil_put_NXAST_CONTROLLER(out);
2271     nac->max_len = htons(oc->max_len);
2272     nac->controller_id = htons(oc->controller_id);
2273     nac->reason = oc->reason;
2274 }
2275
2276 static void
2277 ofpact_dec_ttl_to_nxast(const struct ofpact_cnt_ids *oc_ids,
2278                         struct ofpbuf *out)
2279 {
2280     if (oc_ids->ofpact.compat == OFPUTIL_NXAST_DEC_TTL) {
2281         ofputil_put_NXAST_DEC_TTL(out);
2282     } else {
2283         struct nx_action_cnt_ids *nac_ids =
2284             ofputil_put_NXAST_DEC_TTL_CNT_IDS(out);
2285         int ids_len = ROUND_UP(2 * oc_ids->n_controllers, OFP_ACTION_ALIGN);
2286         ovs_be16 *ids;
2287         size_t i;
2288
2289         nac_ids->len = htons(ntohs(nac_ids->len) + ids_len);
2290         nac_ids->n_controllers = htons(oc_ids->n_controllers);
2291
2292         ids = ofpbuf_put_zeros(out, ids_len);
2293         for (i = 0; i < oc_ids->n_controllers; i++) {
2294             ids[i] = htons(oc_ids->cnt_ids[i]);
2295         }
2296     }
2297 }
2298
2299 static void
2300 ofpact_fin_timeout_to_nxast(const struct ofpact_fin_timeout *fin_timeout,
2301                             struct ofpbuf *out)
2302 {
2303     struct nx_action_fin_timeout *naft = ofputil_put_NXAST_FIN_TIMEOUT(out);
2304     naft->fin_idle_timeout = htons(fin_timeout->fin_idle_timeout);
2305     naft->fin_hard_timeout = htons(fin_timeout->fin_hard_timeout);
2306 }
2307
2308 static void
2309 ofpact_sample_to_nxast(const struct ofpact_sample *os,
2310                        struct ofpbuf *out)
2311 {
2312     struct nx_action_sample *nas;
2313
2314     nas = ofputil_put_NXAST_SAMPLE(out);
2315     nas->probability = htons(os->probability);
2316     nas->collector_set_id = htonl(os->collector_set_id);
2317     nas->obs_domain_id = htonl(os->obs_domain_id);
2318     nas->obs_point_id = htonl(os->obs_point_id);
2319 }
2320
2321 static void
2322 ofpact_to_nxast(const struct ofpact *a, struct ofpbuf *out)
2323 {
2324     switch (a->type) {
2325     case OFPACT_CONTROLLER:
2326         ofpact_controller_to_nxast(ofpact_get_CONTROLLER(a), out);
2327         break;
2328
2329     case OFPACT_OUTPUT_REG:
2330         ofpact_output_reg_to_nxast(ofpact_get_OUTPUT_REG(a), out);
2331         break;
2332
2333     case OFPACT_BUNDLE:
2334         bundle_to_nxast(ofpact_get_BUNDLE(a), out);
2335         break;
2336
2337     case OFPACT_REG_MOVE:
2338         nxm_reg_move_to_nxast(ofpact_get_REG_MOVE(a), out);
2339         break;
2340
2341     case OFPACT_REG_LOAD:
2342         nxm_reg_load_to_nxast(ofpact_get_REG_LOAD(a), out);
2343         break;
2344
2345     case OFPACT_STACK_PUSH:
2346         nxm_stack_push_to_nxast(ofpact_get_STACK_PUSH(a), out);
2347         break;
2348
2349     case OFPACT_STACK_POP:
2350         nxm_stack_pop_to_nxast(ofpact_get_STACK_POP(a), out);
2351         break;
2352
2353     case OFPACT_DEC_TTL:
2354         ofpact_dec_ttl_to_nxast(ofpact_get_DEC_TTL(a), out);
2355         break;
2356
2357     case OFPACT_SET_MPLS_LABEL:
2358         ofputil_put_NXAST_SET_MPLS_LABEL(out)->label
2359             = ofpact_get_SET_MPLS_LABEL(a)->label;
2360         break;
2361
2362     case OFPACT_SET_MPLS_TC:
2363         ofputil_put_NXAST_SET_MPLS_TC(out)->tc
2364             = ofpact_get_SET_MPLS_TC(a)->tc;
2365         break;
2366
2367     case OFPACT_SET_MPLS_TTL:
2368         ofputil_put_NXAST_SET_MPLS_TTL(out)->ttl
2369             = ofpact_get_SET_MPLS_TTL(a)->ttl;
2370         break;
2371
2372     case OFPACT_DEC_MPLS_TTL:
2373         ofputil_put_NXAST_DEC_MPLS_TTL(out);
2374         break;
2375
2376     case OFPACT_SET_TUNNEL:
2377         ofpact_set_tunnel_to_nxast(ofpact_get_SET_TUNNEL(a), out);
2378         break;
2379
2380     case OFPACT_WRITE_METADATA:
2381         ofpact_write_metadata_to_nxast(ofpact_get_WRITE_METADATA(a), out);
2382         break;
2383
2384     case OFPACT_SET_QUEUE:
2385         ofputil_put_NXAST_SET_QUEUE(out)->queue_id
2386             = htonl(ofpact_get_SET_QUEUE(a)->queue_id);
2387         break;
2388
2389     case OFPACT_POP_QUEUE:
2390         ofputil_put_NXAST_POP_QUEUE(out);
2391         break;
2392
2393     case OFPACT_FIN_TIMEOUT:
2394         ofpact_fin_timeout_to_nxast(ofpact_get_FIN_TIMEOUT(a), out);
2395         break;
2396
2397     case OFPACT_RESUBMIT:
2398         ofpact_resubmit_to_nxast(ofpact_get_RESUBMIT(a), out);
2399         break;
2400
2401     case OFPACT_LEARN:
2402         learn_to_nxast(ofpact_get_LEARN(a), out);
2403         break;
2404
2405     case OFPACT_MULTIPATH:
2406         multipath_to_nxast(ofpact_get_MULTIPATH(a), out);
2407         break;
2408
2409     case OFPACT_NOTE:
2410         ofpact_note_to_nxast(ofpact_get_NOTE(a), out);
2411         break;
2412
2413     case OFPACT_EXIT:
2414         ofputil_put_NXAST_EXIT(out);
2415         break;
2416
2417     case OFPACT_PUSH_MPLS:
2418         ofputil_put_NXAST_PUSH_MPLS(out)->ethertype =
2419             ofpact_get_PUSH_MPLS(a)->ethertype;
2420         break;
2421
2422     case OFPACT_POP_MPLS:
2423         ofputil_put_NXAST_POP_MPLS(out)->ethertype =
2424             ofpact_get_POP_MPLS(a)->ethertype;
2425         break;
2426
2427     case OFPACT_SAMPLE:
2428         ofpact_sample_to_nxast(ofpact_get_SAMPLE(a), out);
2429         break;
2430
2431     case OFPACT_GROUP:
2432     case OFPACT_OUTPUT:
2433     case OFPACT_ENQUEUE:
2434     case OFPACT_SET_VLAN_VID:
2435     case OFPACT_SET_VLAN_PCP:
2436     case OFPACT_STRIP_VLAN:
2437     case OFPACT_PUSH_VLAN:
2438     case OFPACT_SET_ETH_SRC:
2439     case OFPACT_SET_ETH_DST:
2440     case OFPACT_SET_IPV4_SRC:
2441     case OFPACT_SET_IPV4_DST:
2442     case OFPACT_SET_IP_DSCP:
2443     case OFPACT_SET_IP_ECN:
2444     case OFPACT_SET_IP_TTL:
2445     case OFPACT_SET_L4_SRC_PORT:
2446     case OFPACT_SET_L4_DST_PORT:
2447     case OFPACT_WRITE_ACTIONS:
2448     case OFPACT_CLEAR_ACTIONS:
2449     case OFPACT_GOTO_TABLE:
2450     case OFPACT_METER:
2451     case OFPACT_SET_FIELD:
2452         NOT_REACHED();
2453     }
2454 }
2455 \f
2456 /* Converting ofpacts to OpenFlow 1.0. */
2457
2458 static void
2459 ofpact_output_to_openflow10(const struct ofpact_output *output,
2460                             struct ofpbuf *out)
2461 {
2462     struct ofp10_action_output *oao;
2463
2464     oao = ofputil_put_OFPAT10_OUTPUT(out);
2465     oao->port = htons(ofp_to_u16(output->port));
2466     oao->max_len = htons(output->max_len);
2467 }
2468
2469 static void
2470 ofpact_enqueue_to_openflow10(const struct ofpact_enqueue *enqueue,
2471                              struct ofpbuf *out)
2472 {
2473     struct ofp10_action_enqueue *oae;
2474
2475     oae = ofputil_put_OFPAT10_ENQUEUE(out);
2476     oae->port = htons(ofp_to_u16(enqueue->port));
2477     oae->queue_id = htonl(enqueue->queue);
2478 }
2479
2480 static void
2481 ofpact_to_openflow10(const struct ofpact *a, struct ofpbuf *out)
2482 {
2483     switch (a->type) {
2484     case OFPACT_OUTPUT:
2485         ofpact_output_to_openflow10(ofpact_get_OUTPUT(a), out);
2486         break;
2487
2488     case OFPACT_ENQUEUE:
2489         ofpact_enqueue_to_openflow10(ofpact_get_ENQUEUE(a), out);
2490         break;
2491
2492     case OFPACT_SET_VLAN_VID:
2493         ofputil_put_OFPAT10_SET_VLAN_VID(out)->vlan_vid
2494             = htons(ofpact_get_SET_VLAN_VID(a)->vlan_vid);
2495         break;
2496
2497     case OFPACT_SET_VLAN_PCP:
2498         ofputil_put_OFPAT10_SET_VLAN_PCP(out)->vlan_pcp
2499             = ofpact_get_SET_VLAN_PCP(a)->vlan_pcp;
2500         break;
2501
2502     case OFPACT_STRIP_VLAN:
2503         ofputil_put_OFPAT10_STRIP_VLAN(out);
2504         break;
2505
2506     case OFPACT_SET_ETH_SRC:
2507         memcpy(ofputil_put_OFPAT10_SET_DL_SRC(out)->dl_addr,
2508                ofpact_get_SET_ETH_SRC(a)->mac, ETH_ADDR_LEN);
2509         break;
2510
2511     case OFPACT_SET_ETH_DST:
2512         memcpy(ofputil_put_OFPAT10_SET_DL_DST(out)->dl_addr,
2513                ofpact_get_SET_ETH_DST(a)->mac, ETH_ADDR_LEN);
2514         break;
2515
2516     case OFPACT_SET_IPV4_SRC:
2517         ofputil_put_OFPAT10_SET_NW_SRC(out)->nw_addr
2518             = ofpact_get_SET_IPV4_SRC(a)->ipv4;
2519         break;
2520
2521     case OFPACT_SET_IPV4_DST:
2522         ofputil_put_OFPAT10_SET_NW_DST(out)->nw_addr
2523             = ofpact_get_SET_IPV4_DST(a)->ipv4;
2524         break;
2525
2526     case OFPACT_SET_IP_DSCP:
2527         ofputil_put_OFPAT10_SET_NW_TOS(out)->nw_tos
2528             = ofpact_get_SET_IP_DSCP(a)->dscp;
2529         break;
2530
2531     case OFPACT_SET_L4_SRC_PORT:
2532         ofputil_put_OFPAT10_SET_TP_SRC(out)->tp_port
2533             = htons(ofpact_get_SET_L4_SRC_PORT(a)->port);
2534         break;
2535
2536     case OFPACT_SET_L4_DST_PORT:
2537         ofputil_put_OFPAT10_SET_TP_DST(out)->tp_port
2538             = htons(ofpact_get_SET_L4_DST_PORT(a)->port);
2539         break;
2540
2541     case OFPACT_PUSH_VLAN:
2542         /* PUSH is a side effect of a SET_VLAN_VID/PCP, which should
2543          * follow this action. */
2544         break;
2545
2546     case OFPACT_CLEAR_ACTIONS:
2547     case OFPACT_WRITE_ACTIONS:
2548     case OFPACT_GOTO_TABLE:
2549     case OFPACT_METER:
2550         /* XXX */
2551         break;
2552
2553     case OFPACT_GROUP:
2554         break;
2555
2556     case OFPACT_SET_FIELD:
2557         set_field_to_openflow(ofpact_get_SET_FIELD(a), out);
2558         break;
2559
2560     case OFPACT_CONTROLLER:
2561     case OFPACT_OUTPUT_REG:
2562     case OFPACT_BUNDLE:
2563     case OFPACT_REG_MOVE:
2564     case OFPACT_REG_LOAD:
2565     case OFPACT_STACK_PUSH:
2566     case OFPACT_STACK_POP:
2567     case OFPACT_DEC_TTL:
2568     case OFPACT_SET_IP_ECN:
2569     case OFPACT_SET_IP_TTL:
2570     case OFPACT_SET_MPLS_LABEL:
2571     case OFPACT_SET_MPLS_TC:
2572     case OFPACT_SET_MPLS_TTL:
2573     case OFPACT_DEC_MPLS_TTL:
2574     case OFPACT_SET_TUNNEL:
2575     case OFPACT_WRITE_METADATA:
2576     case OFPACT_SET_QUEUE:
2577     case OFPACT_POP_QUEUE:
2578     case OFPACT_FIN_TIMEOUT:
2579     case OFPACT_RESUBMIT:
2580     case OFPACT_LEARN:
2581     case OFPACT_MULTIPATH:
2582     case OFPACT_NOTE:
2583     case OFPACT_EXIT:
2584     case OFPACT_PUSH_MPLS:
2585     case OFPACT_POP_MPLS:
2586     case OFPACT_SAMPLE:
2587         ofpact_to_nxast(a, out);
2588         break;
2589     }
2590 }
2591 \f
2592 /* Converting ofpacts to OpenFlow 1.1. */
2593
2594 static void
2595 ofpact_output_to_openflow11(const struct ofpact_output *output,
2596                             struct ofpbuf *out)
2597 {
2598     struct ofp11_action_output *oao;
2599
2600     oao = ofputil_put_OFPAT11_OUTPUT(out);
2601     oao->port = ofputil_port_to_ofp11(output->port);
2602     oao->max_len = htons(output->max_len);
2603 }
2604
2605 static void
2606 ofpact_dec_ttl_to_openflow11(const struct ofpact_cnt_ids *dec_ttl,
2607                              struct ofpbuf *out)
2608 {
2609     if (dec_ttl->n_controllers == 1 && dec_ttl->cnt_ids[0] == 0
2610         && (!dec_ttl->ofpact.compat ||
2611             dec_ttl->ofpact.compat == OFPUTIL_OFPAT11_DEC_NW_TTL)) {
2612         ofputil_put_OFPAT11_DEC_NW_TTL(out);
2613     } else {
2614         ofpact_dec_ttl_to_nxast(dec_ttl, out);
2615     }
2616 }
2617
2618 static void
2619 ofpact_to_openflow11(const struct ofpact *a, struct ofpbuf *out)
2620 {
2621     switch (a->type) {
2622     case OFPACT_OUTPUT:
2623         return ofpact_output_to_openflow11(ofpact_get_OUTPUT(a), out);
2624
2625     case OFPACT_ENQUEUE:
2626         /* XXX */
2627         break;
2628
2629     case OFPACT_SET_VLAN_VID:
2630         /* Push a VLAN tag, if one was not seen at action validation time. */
2631         if (!ofpact_get_SET_VLAN_VID(a)->flow_has_vlan
2632             && ofpact_get_SET_VLAN_VID(a)->push_vlan_if_needed) {
2633             ofputil_put_OFPAT11_PUSH_VLAN(out)->ethertype
2634                 = htons(ETH_TYPE_VLAN_8021Q);
2635         }
2636         ofputil_put_OFPAT11_SET_VLAN_VID(out)->vlan_vid
2637             = htons(ofpact_get_SET_VLAN_VID(a)->vlan_vid);
2638         break;
2639
2640     case OFPACT_SET_VLAN_PCP:
2641         /* Push a VLAN tag, if one was not seen at action validation time. */
2642         if (!ofpact_get_SET_VLAN_PCP(a)->flow_has_vlan
2643             && ofpact_get_SET_VLAN_PCP(a)->push_vlan_if_needed) {
2644             ofputil_put_OFPAT11_PUSH_VLAN(out)->ethertype
2645                 = htons(ETH_TYPE_VLAN_8021Q);
2646         }
2647         ofputil_put_OFPAT11_SET_VLAN_PCP(out)->vlan_pcp
2648             = ofpact_get_SET_VLAN_PCP(a)->vlan_pcp;
2649         break;
2650
2651     case OFPACT_STRIP_VLAN:
2652         ofputil_put_OFPAT11_POP_VLAN(out);
2653         break;
2654
2655     case OFPACT_PUSH_VLAN:
2656         /* XXX ETH_TYPE_VLAN_8021AD case */
2657         ofputil_put_OFPAT11_PUSH_VLAN(out)->ethertype =
2658             htons(ETH_TYPE_VLAN_8021Q);
2659         break;
2660
2661     case OFPACT_SET_QUEUE:
2662         ofputil_put_OFPAT11_SET_QUEUE(out)->queue_id
2663             = htonl(ofpact_get_SET_QUEUE(a)->queue_id);
2664         break;
2665
2666     case OFPACT_SET_ETH_SRC:
2667         memcpy(ofputil_put_OFPAT11_SET_DL_SRC(out)->dl_addr,
2668                ofpact_get_SET_ETH_SRC(a)->mac, ETH_ADDR_LEN);
2669         break;
2670
2671     case OFPACT_SET_ETH_DST:
2672         memcpy(ofputil_put_OFPAT11_SET_DL_DST(out)->dl_addr,
2673                ofpact_get_SET_ETH_DST(a)->mac, ETH_ADDR_LEN);
2674         break;
2675
2676     case OFPACT_SET_IPV4_SRC:
2677         ofputil_put_OFPAT11_SET_NW_SRC(out)->nw_addr
2678             = ofpact_get_SET_IPV4_SRC(a)->ipv4;
2679         break;
2680
2681     case OFPACT_SET_IPV4_DST:
2682         ofputil_put_OFPAT11_SET_NW_DST(out)->nw_addr
2683             = ofpact_get_SET_IPV4_DST(a)->ipv4;
2684         break;
2685
2686     case OFPACT_SET_IP_DSCP:
2687         ofputil_put_OFPAT11_SET_NW_TOS(out)->nw_tos
2688             = ofpact_get_SET_IP_DSCP(a)->dscp;
2689         break;
2690
2691     case OFPACT_SET_IP_ECN:
2692         ofputil_put_OFPAT11_SET_NW_ECN(out)->nw_ecn
2693             = ofpact_get_SET_IP_ECN(a)->ecn;
2694         break;
2695
2696     case OFPACT_SET_IP_TTL:
2697         ofputil_put_OFPAT11_SET_NW_TTL(out)->nw_ttl
2698             = ofpact_get_SET_IP_TTL(a)->ttl;
2699         break;
2700
2701     case OFPACT_SET_L4_SRC_PORT:
2702         ofputil_put_OFPAT11_SET_TP_SRC(out)->tp_port
2703             = htons(ofpact_get_SET_L4_SRC_PORT(a)->port);
2704         break;
2705
2706     case OFPACT_SET_L4_DST_PORT:
2707         ofputil_put_OFPAT11_SET_TP_DST(out)->tp_port
2708             = htons(ofpact_get_SET_L4_DST_PORT(a)->port);
2709         break;
2710
2711     case OFPACT_DEC_TTL:
2712         ofpact_dec_ttl_to_openflow11(ofpact_get_DEC_TTL(a), out);
2713         break;
2714
2715     case OFPACT_SET_MPLS_LABEL:
2716         ofputil_put_OFPAT11_SET_MPLS_LABEL(out)->mpls_label
2717             = ofpact_get_SET_MPLS_LABEL(a)->label;
2718         break;
2719
2720     case OFPACT_SET_MPLS_TC:
2721         ofputil_put_OFPAT11_SET_MPLS_TC(out)->mpls_tc
2722             = ofpact_get_SET_MPLS_TC(a)->tc;
2723         break;
2724
2725     case OFPACT_SET_MPLS_TTL:
2726         ofputil_put_OFPAT11_SET_MPLS_TTL(out)->mpls_ttl
2727             = ofpact_get_SET_MPLS_TTL(a)->ttl;
2728         break;
2729
2730     case OFPACT_DEC_MPLS_TTL:
2731         ofputil_put_OFPAT11_DEC_MPLS_TTL(out);
2732         break;
2733
2734     case OFPACT_WRITE_METADATA:
2735         /* OpenFlow 1.1 uses OFPIT_WRITE_METADATA to express this action. */
2736         break;
2737
2738     case OFPACT_PUSH_MPLS:
2739         ofputil_put_OFPAT11_PUSH_MPLS(out)->ethertype =
2740             ofpact_get_PUSH_MPLS(a)->ethertype;
2741         break;
2742
2743     case OFPACT_POP_MPLS:
2744         ofputil_put_OFPAT11_POP_MPLS(out)->ethertype =
2745             ofpact_get_POP_MPLS(a)->ethertype;
2746
2747         break;
2748
2749     case OFPACT_CLEAR_ACTIONS:
2750     case OFPACT_WRITE_ACTIONS:
2751     case OFPACT_GOTO_TABLE:
2752     case OFPACT_METER:
2753         NOT_REACHED();
2754
2755     case OFPACT_GROUP:
2756         ofputil_put_OFPAT11_GROUP(out)->group_id =
2757             htonl(ofpact_get_GROUP(a)->group_id);
2758         break;
2759
2760     case OFPACT_SET_FIELD:
2761         set_field_to_openflow(ofpact_get_SET_FIELD(a), out);
2762         break;
2763
2764     case OFPACT_CONTROLLER:
2765     case OFPACT_OUTPUT_REG:
2766     case OFPACT_BUNDLE:
2767     case OFPACT_REG_MOVE:
2768     case OFPACT_REG_LOAD:
2769     case OFPACT_STACK_PUSH:
2770     case OFPACT_STACK_POP:
2771     case OFPACT_SET_TUNNEL:
2772     case OFPACT_POP_QUEUE:
2773     case OFPACT_FIN_TIMEOUT:
2774     case OFPACT_RESUBMIT:
2775     case OFPACT_LEARN:
2776     case OFPACT_MULTIPATH:
2777     case OFPACT_NOTE:
2778     case OFPACT_EXIT:
2779     case OFPACT_SAMPLE:
2780         ofpact_to_nxast(a, out);
2781         break;
2782     }
2783 }
2784
2785 /* Output deprecated set actions as set_field actions. */
2786 static void
2787 ofpact_to_openflow12(const struct ofpact *a, struct ofpbuf *out)
2788 {
2789     enum mf_field_id field;
2790     union mf_value value;
2791     struct ofpact_l4_port *l4port;
2792     uint8_t proto;
2793
2794     /*
2795      * Convert actions deprecated in OpenFlow 1.2 to Set Field actions,
2796      * if possible.
2797      */
2798     switch ((int)a->type) {
2799     case OFPACT_SET_VLAN_VID:
2800     case OFPACT_SET_VLAN_PCP:
2801     case OFPACT_SET_ETH_SRC:
2802     case OFPACT_SET_ETH_DST:
2803     case OFPACT_SET_IPV4_SRC:
2804     case OFPACT_SET_IPV4_DST:
2805     case OFPACT_SET_IP_DSCP:
2806     case OFPACT_SET_IP_ECN:
2807     case OFPACT_SET_L4_SRC_PORT:
2808     case OFPACT_SET_L4_DST_PORT:
2809     case OFPACT_SET_MPLS_LABEL:
2810     case OFPACT_SET_MPLS_TC:
2811     case OFPACT_SET_TUNNEL:  /* Convert to a set_field, too. */
2812
2813         switch ((int)a->type) {
2814
2815         case OFPACT_SET_VLAN_VID:
2816             if (!ofpact_get_SET_VLAN_VID(a)->flow_has_vlan &&
2817                 ofpact_get_SET_VLAN_VID(a)->push_vlan_if_needed) {
2818                 ofputil_put_OFPAT11_PUSH_VLAN(out)->ethertype
2819                     = htons(ETH_TYPE_VLAN_8021Q);
2820             }
2821             field = MFF_VLAN_VID;
2822             /* Set-Field on OXM_OF_VLAN_VID must have OFPVID_PRESENT set. */
2823             value.be16 = htons(ofpact_get_SET_VLAN_VID(a)->vlan_vid
2824                                | OFPVID12_PRESENT);
2825             break;
2826
2827         case OFPACT_SET_VLAN_PCP:
2828             if (!ofpact_get_SET_VLAN_PCP(a)->flow_has_vlan &&
2829                 ofpact_get_SET_VLAN_PCP(a)->push_vlan_if_needed) {
2830                 ofputil_put_OFPAT11_PUSH_VLAN(out)->ethertype
2831                     = htons(ETH_TYPE_VLAN_8021Q);
2832             }
2833             field = MFF_VLAN_PCP;
2834             value.u8 = ofpact_get_SET_VLAN_PCP(a)->vlan_pcp;
2835             break;
2836
2837         case OFPACT_SET_ETH_SRC:
2838             field = MFF_ETH_SRC;
2839             memcpy(value.mac, ofpact_get_SET_ETH_SRC(a)->mac, ETH_ADDR_LEN);
2840             break;
2841
2842         case OFPACT_SET_ETH_DST:
2843             field = MFF_ETH_DST;
2844             memcpy(value.mac, ofpact_get_SET_ETH_DST(a)->mac, ETH_ADDR_LEN);
2845             break;
2846
2847         case OFPACT_SET_IPV4_SRC:
2848             field = MFF_IPV4_SRC;
2849             value.be32 = ofpact_get_SET_IPV4_SRC(a)->ipv4;
2850             break;
2851
2852         case OFPACT_SET_IPV4_DST:
2853             field = MFF_IPV4_DST;
2854             value.be32 = ofpact_get_SET_IPV4_DST(a)->ipv4;
2855             break;
2856
2857         case OFPACT_SET_IP_DSCP:
2858             field = MFF_IP_DSCP_SHIFTED; /* OXM_OF_IP_DSCP */
2859             value.u8 = ofpact_get_SET_IP_DSCP(a)->dscp >> 2;
2860             break;
2861
2862         case OFPACT_SET_IP_ECN:
2863             field = MFF_IP_ECN;
2864             value.u8 = ofpact_get_SET_IP_ECN(a)->ecn;
2865             break;
2866
2867         case OFPACT_SET_L4_SRC_PORT:
2868             /* We keep track of IP protocol while translating actions to be
2869              * able to translate to the proper OXM type.
2870              * If the IP protocol type is unknown, the translation cannot
2871              * be performed and we will send the action using the original
2872              * action type. */
2873             l4port = ofpact_get_SET_L4_SRC_PORT(a);
2874             proto = l4port->flow_ip_proto;
2875             field = proto == IPPROTO_TCP ? MFF_TCP_SRC
2876                 : proto == IPPROTO_UDP ? MFF_UDP_SRC
2877                 : proto == IPPROTO_SCTP ? MFF_SCTP_SRC
2878                 : MFF_N_IDS; /* RFC: Unknown IP proto, do not translate. */
2879             value.be16 = htons(l4port->port);
2880             break;
2881
2882         case OFPACT_SET_L4_DST_PORT:
2883             l4port = ofpact_get_SET_L4_DST_PORT(a);
2884             proto = l4port->flow_ip_proto;
2885             field = proto == IPPROTO_TCP ? MFF_TCP_DST
2886                 : proto == IPPROTO_UDP ? MFF_UDP_DST
2887                 : proto == IPPROTO_SCTP ? MFF_SCTP_DST
2888                 : MFF_N_IDS; /* RFC: Unknown IP proto, do not translate. */
2889             value.be16 = htons(l4port->port);
2890             break;
2891
2892         case OFPACT_SET_MPLS_LABEL:
2893             field = MFF_MPLS_LABEL;
2894             value.be32 = ofpact_get_SET_MPLS_LABEL(a)->label;
2895             break;
2896
2897         case OFPACT_SET_MPLS_TC:
2898             field = MFF_MPLS_TC;
2899             value.u8 = ofpact_get_SET_MPLS_TC(a)->tc;
2900             break;
2901
2902         case OFPACT_SET_TUNNEL:
2903             field = MFF_TUN_ID;
2904             value.be64 = htonll(ofpact_get_SET_TUNNEL(a)->tun_id);
2905             break;
2906
2907         default:
2908             field = MFF_N_IDS;
2909         }
2910
2911         /* Put the action out as a set field action, if possible. */
2912         if (field < MFF_N_IDS) {
2913             uint64_t ofpacts_stub[128 / 8];
2914             struct ofpbuf sf_act;
2915             struct ofpact_set_field *sf;
2916
2917             ofpbuf_use_stub(&sf_act, ofpacts_stub, sizeof ofpacts_stub);
2918             sf = ofpact_put_SET_FIELD(&sf_act);
2919             sf->field = mf_from_id(field);
2920             memcpy(&sf->value, &value, sf->field->n_bytes);
2921             set_field_to_openflow(sf, out);
2922             return;
2923         }
2924     }
2925
2926     ofpact_to_openflow11(a, out);
2927 }
2928
2929 /* Converts the 'ofpacts_len' bytes of ofpacts in 'ofpacts' into OpenFlow
2930  * actions in 'openflow', appending the actions to any existing data in
2931  * 'openflow'. */
2932 size_t
2933 ofpacts_put_openflow_actions(const struct ofpact ofpacts[], size_t ofpacts_len,
2934                              struct ofpbuf *openflow,
2935                              enum ofp_version ofp_version)
2936 {
2937     const struct ofpact *a;
2938     size_t start_size = openflow->size;
2939
2940     void (*translate)(const struct ofpact *a, struct ofpbuf *out) =
2941         (ofp_version == OFP10_VERSION) ? ofpact_to_openflow10 :
2942         (ofp_version == OFP11_VERSION) ? ofpact_to_openflow11 :
2943         ofpact_to_openflow12;
2944
2945     OFPACT_FOR_EACH (a, ofpacts, ofpacts_len) {
2946         translate(a, openflow);
2947     }
2948     return openflow->size - start_size;
2949 }
2950
2951 static void
2952 ofpacts_update_instruction_actions(struct ofpbuf *openflow, size_t ofs)
2953 {
2954     struct ofp11_instruction_actions *oia;
2955
2956     /* Update the instruction's length (or, if it's empty, delete it). */
2957     oia = ofpbuf_at_assert(openflow, ofs, sizeof *oia);
2958     if (openflow->size > ofs + sizeof *oia) {
2959         oia->len = htons(openflow->size - ofs);
2960     } else {
2961         openflow->size = ofs;
2962     }
2963 }
2964
2965 void
2966 ofpacts_put_openflow_instructions(const struct ofpact ofpacts[],
2967                                   size_t ofpacts_len,
2968                                   struct ofpbuf *openflow,
2969                                   enum ofp_version ofp_version)
2970 {
2971     const struct ofpact *a;
2972
2973     ovs_assert(ofp_version >= OFP11_VERSION);
2974
2975     OFPACT_FOR_EACH (a, ofpacts, ofpacts_len) {
2976         switch (ovs_instruction_type_from_ofpact_type(a->type)) {
2977         case OVSINST_OFPIT11_CLEAR_ACTIONS:
2978             instruction_put_OFPIT11_CLEAR_ACTIONS(openflow);
2979             break;
2980
2981         case OVSINST_OFPIT11_GOTO_TABLE: {
2982             struct ofp11_instruction_goto_table *oigt;
2983             oigt = instruction_put_OFPIT11_GOTO_TABLE(openflow);
2984             oigt->table_id = ofpact_get_GOTO_TABLE(a)->table_id;
2985             memset(oigt->pad, 0, sizeof oigt->pad);
2986             break;
2987         }
2988
2989         case OVSINST_OFPIT11_WRITE_METADATA: {
2990             const struct ofpact_metadata *om;
2991             struct ofp11_instruction_write_metadata *oiwm;
2992
2993             om = ofpact_get_WRITE_METADATA(a);
2994             oiwm = instruction_put_OFPIT11_WRITE_METADATA(openflow);
2995             oiwm->metadata = om->metadata;
2996             oiwm->metadata_mask = om->mask;
2997             break;
2998         }
2999
3000         case OVSINST_OFPIT13_METER:
3001             if (ofp_version >= OFP13_VERSION) {
3002                 const struct ofpact_meter *om;
3003                 struct ofp13_instruction_meter *oim;
3004
3005                 om = ofpact_get_METER(a);
3006                 oim = instruction_put_OFPIT13_METER(openflow);
3007                 oim->meter_id = htonl(om->meter_id);
3008             }
3009             break;
3010
3011         case OVSINST_OFPIT11_APPLY_ACTIONS: {
3012             const size_t ofs = openflow->size;
3013             const size_t ofpacts_len_left =
3014                 (uint8_t*)ofpact_end(ofpacts, ofpacts_len) - (uint8_t*)a;
3015             const struct ofpact *action;
3016             const struct ofpact *processed = a;
3017
3018             instruction_put_OFPIT11_APPLY_ACTIONS(openflow);
3019             OFPACT_FOR_EACH(action, a, ofpacts_len_left) {
3020                 if (ovs_instruction_type_from_ofpact_type(action->type)
3021                     != OVSINST_OFPIT11_APPLY_ACTIONS) {
3022                     break;
3023                 }
3024                 if (ofp_version == OFP11_VERSION) {
3025                     ofpact_to_openflow11(action, openflow);
3026                 } else {
3027                     ofpact_to_openflow12(action, openflow);
3028                 }
3029                 processed = action;
3030             }
3031             ofpacts_update_instruction_actions(openflow, ofs);
3032             a = processed;
3033             break;
3034         }
3035
3036         case OVSINST_OFPIT11_WRITE_ACTIONS: {
3037             const size_t ofs = openflow->size;
3038             const struct ofpact_nest *on;
3039
3040             on = ofpact_get_WRITE_ACTIONS(a);
3041             instruction_put_OFPIT11_WRITE_ACTIONS(openflow);
3042             ofpacts_put_openflow_actions(on->actions,
3043                                          ofpact_nest_get_action_len(on),
3044                                          openflow, ofp_version);
3045             ofpacts_update_instruction_actions(openflow, ofs);
3046
3047             break;
3048         }
3049         }
3050     }
3051 }
3052 \f
3053 /* Returns true if 'action' outputs to 'port', false otherwise. */
3054 static bool
3055 ofpact_outputs_to_port(const struct ofpact *ofpact, ofp_port_t port)
3056 {
3057     switch (ofpact->type) {
3058     case OFPACT_OUTPUT:
3059         return ofpact_get_OUTPUT(ofpact)->port == port;
3060     case OFPACT_ENQUEUE:
3061         return ofpact_get_ENQUEUE(ofpact)->port == port;
3062     case OFPACT_CONTROLLER:
3063         return port == OFPP_CONTROLLER;
3064
3065     case OFPACT_OUTPUT_REG:
3066     case OFPACT_BUNDLE:
3067     case OFPACT_SET_VLAN_VID:
3068     case OFPACT_SET_VLAN_PCP:
3069     case OFPACT_STRIP_VLAN:
3070     case OFPACT_PUSH_VLAN:
3071     case OFPACT_SET_ETH_SRC:
3072     case OFPACT_SET_ETH_DST:
3073     case OFPACT_SET_IPV4_SRC:
3074     case OFPACT_SET_IPV4_DST:
3075     case OFPACT_SET_IP_DSCP:
3076     case OFPACT_SET_IP_ECN:
3077     case OFPACT_SET_IP_TTL:
3078     case OFPACT_SET_L4_SRC_PORT:
3079     case OFPACT_SET_L4_DST_PORT:
3080     case OFPACT_REG_MOVE:
3081     case OFPACT_REG_LOAD:
3082     case OFPACT_SET_FIELD:
3083     case OFPACT_STACK_PUSH:
3084     case OFPACT_STACK_POP:
3085     case OFPACT_DEC_TTL:
3086     case OFPACT_SET_MPLS_LABEL:
3087     case OFPACT_SET_MPLS_TC:
3088     case OFPACT_SET_MPLS_TTL:
3089     case OFPACT_DEC_MPLS_TTL:
3090     case OFPACT_SET_TUNNEL:
3091     case OFPACT_WRITE_METADATA:
3092     case OFPACT_SET_QUEUE:
3093     case OFPACT_POP_QUEUE:
3094     case OFPACT_FIN_TIMEOUT:
3095     case OFPACT_RESUBMIT:
3096     case OFPACT_LEARN:
3097     case OFPACT_MULTIPATH:
3098     case OFPACT_NOTE:
3099     case OFPACT_EXIT:
3100     case OFPACT_PUSH_MPLS:
3101     case OFPACT_POP_MPLS:
3102     case OFPACT_SAMPLE:
3103     case OFPACT_CLEAR_ACTIONS:
3104     case OFPACT_WRITE_ACTIONS:
3105     case OFPACT_GOTO_TABLE:
3106     case OFPACT_METER:
3107     case OFPACT_GROUP:
3108     default:
3109         return false;
3110     }
3111 }
3112
3113 /* Returns true if any action in the 'ofpacts_len' bytes of 'ofpacts' outputs
3114  * to 'port', false otherwise. */
3115 bool
3116 ofpacts_output_to_port(const struct ofpact *ofpacts, size_t ofpacts_len,
3117                        ofp_port_t port)
3118 {
3119     const struct ofpact *a;
3120
3121     OFPACT_FOR_EACH (a, ofpacts, ofpacts_len) {
3122         if (ofpact_outputs_to_port(a, port)) {
3123             return true;
3124         }
3125     }
3126
3127     return false;
3128 }
3129
3130 /* Returns true if any action in the 'ofpacts_len' bytes of 'ofpacts' outputs
3131  * to 'group', false otherwise. */
3132 bool
3133 ofpacts_output_to_group(const struct ofpact *ofpacts, size_t ofpacts_len,
3134                         uint32_t group_id)
3135 {
3136     const struct ofpact *a;
3137
3138     OFPACT_FOR_EACH (a, ofpacts, ofpacts_len) {
3139         if (a->type == OFPACT_GROUP
3140             && ofpact_get_GROUP(a)->group_id == group_id) {
3141             return true;
3142         }
3143     }
3144
3145     return false;
3146 }
3147
3148 bool
3149 ofpacts_equal(const struct ofpact *a, size_t a_len,
3150               const struct ofpact *b, size_t b_len)
3151 {
3152     return a_len == b_len && !memcmp(a, b, a_len);
3153 }
3154
3155 /* Finds the OFPACT_METER action, if any, in the 'ofpacts_len' bytes of
3156  * 'ofpacts'.  If found, returns its meter ID; if not, returns 0.
3157  *
3158  * This function relies on the order of 'ofpacts' being correct (as checked by
3159  * ofpacts_verify()). */
3160 uint32_t
3161 ofpacts_get_meter(const struct ofpact ofpacts[], size_t ofpacts_len)
3162 {
3163     const struct ofpact *a;
3164
3165     OFPACT_FOR_EACH (a, ofpacts, ofpacts_len) {
3166         enum ovs_instruction_type inst;
3167
3168         inst = ovs_instruction_type_from_ofpact_type(a->type);
3169         if (a->type == OFPACT_METER) {
3170             return ofpact_get_METER(a)->meter_id;
3171         } else if (inst > OVSINST_OFPIT13_METER) {
3172             break;
3173         }
3174     }
3175
3176     return 0;
3177 }
3178 \f
3179 /* Formatting ofpacts. */
3180
3181 static void
3182 print_note(const struct ofpact_note *note, struct ds *string)
3183 {
3184     size_t i;
3185
3186     ds_put_cstr(string, "note:");
3187     for (i = 0; i < note->length; i++) {
3188         if (i) {
3189             ds_put_char(string, '.');
3190         }
3191         ds_put_format(string, "%02"PRIx8, note->data[i]);
3192     }
3193 }
3194
3195 static void
3196 print_dec_ttl(const struct ofpact_cnt_ids *ids,
3197               struct ds *s)
3198 {
3199     size_t i;
3200
3201     ds_put_cstr(s, "dec_ttl");
3202     if (ids->ofpact.compat == OFPUTIL_NXAST_DEC_TTL_CNT_IDS) {
3203         ds_put_cstr(s, "(");
3204         for (i = 0; i < ids->n_controllers; i++) {
3205             if (i) {
3206                 ds_put_cstr(s, ",");
3207             }
3208             ds_put_format(s, "%"PRIu16, ids->cnt_ids[i]);
3209         }
3210         ds_put_cstr(s, ")");
3211     }
3212 }
3213
3214 static void
3215 print_fin_timeout(const struct ofpact_fin_timeout *fin_timeout,
3216                   struct ds *s)
3217 {
3218     ds_put_cstr(s, "fin_timeout(");
3219     if (fin_timeout->fin_idle_timeout) {
3220         ds_put_format(s, "idle_timeout=%"PRIu16",",
3221                       fin_timeout->fin_idle_timeout);
3222     }
3223     if (fin_timeout->fin_hard_timeout) {
3224         ds_put_format(s, "hard_timeout=%"PRIu16",",
3225                       fin_timeout->fin_hard_timeout);
3226     }
3227     ds_chomp(s, ',');
3228     ds_put_char(s, ')');
3229 }
3230
3231 static void
3232 ofpact_format(const struct ofpact *a, struct ds *s)
3233 {
3234     const struct ofpact_enqueue *enqueue;
3235     const struct ofpact_resubmit *resubmit;
3236     const struct ofpact_controller *controller;
3237     const struct ofpact_metadata *metadata;
3238     const struct ofpact_tunnel *tunnel;
3239     const struct ofpact_sample *sample;
3240     const struct ofpact_set_field *set_field;
3241     const struct mf_field *mf;
3242     ofp_port_t port;
3243
3244     switch (a->type) {
3245     case OFPACT_OUTPUT:
3246         port = ofpact_get_OUTPUT(a)->port;
3247         if (ofp_to_u16(port) < ofp_to_u16(OFPP_MAX)) {
3248             ds_put_format(s, "output:%"PRIu16, port);
3249         } else {
3250             ofputil_format_port(port, s);
3251             if (port == OFPP_CONTROLLER) {
3252                 ds_put_format(s, ":%"PRIu16, ofpact_get_OUTPUT(a)->max_len);
3253             }
3254         }
3255         break;
3256
3257     case OFPACT_CONTROLLER:
3258         controller = ofpact_get_CONTROLLER(a);
3259         if (controller->reason == OFPR_ACTION &&
3260             controller->controller_id == 0) {
3261             ds_put_format(s, "CONTROLLER:%"PRIu16,
3262                           ofpact_get_CONTROLLER(a)->max_len);
3263         } else {
3264             enum ofp_packet_in_reason reason = controller->reason;
3265
3266             ds_put_cstr(s, "controller(");
3267             if (reason != OFPR_ACTION) {
3268                 char reasonbuf[OFPUTIL_PACKET_IN_REASON_BUFSIZE];
3269
3270                 ds_put_format(s, "reason=%s,",
3271                               ofputil_packet_in_reason_to_string(
3272                                   reason, reasonbuf, sizeof reasonbuf));
3273             }
3274             if (controller->max_len != UINT16_MAX) {
3275                 ds_put_format(s, "max_len=%"PRIu16",", controller->max_len);
3276             }
3277             if (controller->controller_id != 0) {
3278                 ds_put_format(s, "id=%"PRIu16",", controller->controller_id);
3279             }
3280             ds_chomp(s, ',');
3281             ds_put_char(s, ')');
3282         }
3283         break;
3284
3285     case OFPACT_ENQUEUE:
3286         enqueue = ofpact_get_ENQUEUE(a);
3287         ds_put_format(s, "enqueue:");
3288         ofputil_format_port(enqueue->port, s);
3289         ds_put_format(s, ":%"PRIu32, enqueue->queue);
3290         break;
3291
3292     case OFPACT_OUTPUT_REG:
3293         ds_put_cstr(s, "output:");
3294         mf_format_subfield(&ofpact_get_OUTPUT_REG(a)->src, s);
3295         break;
3296
3297     case OFPACT_BUNDLE:
3298         bundle_format(ofpact_get_BUNDLE(a), s);
3299         break;
3300
3301     case OFPACT_SET_VLAN_VID:
3302         ds_put_format(s, "%s:%"PRIu16,
3303                       (a->compat == OFPUTIL_OFPAT11_SET_VLAN_VID
3304                        ? "set_vlan_vid"
3305                        : "mod_vlan_vid"),
3306                       ofpact_get_SET_VLAN_VID(a)->vlan_vid);
3307         break;
3308
3309     case OFPACT_SET_VLAN_PCP:
3310         ds_put_format(s, "%s:%"PRIu8,
3311                       (a->compat == OFPUTIL_OFPAT11_SET_VLAN_PCP
3312                        ? "set_vlan_pcp"
3313                        : "mod_vlan_pcp"),
3314                       ofpact_get_SET_VLAN_PCP(a)->vlan_pcp);
3315         break;
3316
3317     case OFPACT_STRIP_VLAN:
3318         ds_put_cstr(s, a->compat == OFPUTIL_OFPAT11_POP_VLAN
3319                     ? "pop_vlan" : "strip_vlan");
3320         break;
3321
3322     case OFPACT_PUSH_VLAN:
3323         /* XXX 802.1AD case*/
3324         ds_put_format(s, "push_vlan:%#"PRIx16, ETH_TYPE_VLAN_8021Q);
3325         break;
3326
3327     case OFPACT_SET_ETH_SRC:
3328         ds_put_format(s, "mod_dl_src:"ETH_ADDR_FMT,
3329                       ETH_ADDR_ARGS(ofpact_get_SET_ETH_SRC(a)->mac));
3330         break;
3331
3332     case OFPACT_SET_ETH_DST:
3333         ds_put_format(s, "mod_dl_dst:"ETH_ADDR_FMT,
3334                       ETH_ADDR_ARGS(ofpact_get_SET_ETH_DST(a)->mac));
3335         break;
3336
3337     case OFPACT_SET_IPV4_SRC:
3338         ds_put_format(s, "mod_nw_src:"IP_FMT,
3339                       IP_ARGS(ofpact_get_SET_IPV4_SRC(a)->ipv4));
3340         break;
3341
3342     case OFPACT_SET_IPV4_DST:
3343         ds_put_format(s, "mod_nw_dst:"IP_FMT,
3344                       IP_ARGS(ofpact_get_SET_IPV4_DST(a)->ipv4));
3345         break;
3346
3347     case OFPACT_SET_IP_DSCP:
3348         ds_put_format(s, "mod_nw_tos:%d", ofpact_get_SET_IP_DSCP(a)->dscp);
3349         break;
3350
3351     case OFPACT_SET_IP_ECN:
3352         ds_put_format(s, "mod_nw_ecn:%d", ofpact_get_SET_IP_ECN(a)->ecn);
3353         break;
3354
3355     case OFPACT_SET_IP_TTL:
3356         ds_put_format(s, "mod_nw_ttl:%d", ofpact_get_SET_IP_TTL(a)->ttl);
3357         break;
3358
3359     case OFPACT_SET_L4_SRC_PORT:
3360         ds_put_format(s, "mod_tp_src:%d", ofpact_get_SET_L4_SRC_PORT(a)->port);
3361         break;
3362
3363     case OFPACT_SET_L4_DST_PORT:
3364         ds_put_format(s, "mod_tp_dst:%d", ofpact_get_SET_L4_DST_PORT(a)->port);
3365         break;
3366
3367     case OFPACT_REG_MOVE:
3368         nxm_format_reg_move(ofpact_get_REG_MOVE(a), s);
3369         break;
3370
3371     case OFPACT_REG_LOAD:
3372         nxm_format_reg_load(ofpact_get_REG_LOAD(a), s);
3373         break;
3374
3375     case OFPACT_SET_FIELD:
3376         set_field = ofpact_get_SET_FIELD(a);
3377         mf = set_field->field;
3378         ds_put_format(s, "set_field:");
3379         mf_format(mf, &set_field->value, NULL, s);
3380         ds_put_format(s, "->%s", mf->name);
3381         break;
3382
3383     case OFPACT_STACK_PUSH:
3384         nxm_format_stack_push(ofpact_get_STACK_PUSH(a), s);
3385         break;
3386
3387     case OFPACT_STACK_POP:
3388         nxm_format_stack_pop(ofpact_get_STACK_POP(a), s);
3389         break;
3390
3391     case OFPACT_DEC_TTL:
3392         print_dec_ttl(ofpact_get_DEC_TTL(a), s);
3393         break;
3394
3395     case OFPACT_SET_MPLS_LABEL:
3396         ds_put_format(s, "set_mpls_label(%"PRIu32")",
3397                       ntohl(ofpact_get_SET_MPLS_LABEL(a)->label));
3398         break;
3399
3400     case OFPACT_SET_MPLS_TC:
3401         ds_put_format(s, "set_mpls_ttl(%"PRIu8")",
3402                       ofpact_get_SET_MPLS_TC(a)->tc);
3403         break;
3404
3405     case OFPACT_SET_MPLS_TTL:
3406         ds_put_format(s, "set_mpls_ttl(%"PRIu8")",
3407                       ofpact_get_SET_MPLS_TTL(a)->ttl);
3408         break;
3409
3410     case OFPACT_DEC_MPLS_TTL:
3411         ds_put_cstr(s, "dec_mpls_ttl");
3412         break;
3413
3414     case OFPACT_SET_TUNNEL:
3415         tunnel = ofpact_get_SET_TUNNEL(a);
3416         ds_put_format(s, "set_tunnel%s:%#"PRIx64,
3417                       (tunnel->tun_id > UINT32_MAX
3418                        || a->compat == OFPUTIL_NXAST_SET_TUNNEL64 ? "64" : ""),
3419                       tunnel->tun_id);
3420         break;
3421
3422     case OFPACT_SET_QUEUE:
3423         ds_put_format(s, "set_queue:%"PRIu32,
3424                       ofpact_get_SET_QUEUE(a)->queue_id);
3425         break;
3426
3427     case OFPACT_POP_QUEUE:
3428         ds_put_cstr(s, "pop_queue");
3429         break;
3430
3431     case OFPACT_FIN_TIMEOUT:
3432         print_fin_timeout(ofpact_get_FIN_TIMEOUT(a), s);
3433         break;
3434
3435     case OFPACT_RESUBMIT:
3436         resubmit = ofpact_get_RESUBMIT(a);
3437         if (resubmit->in_port != OFPP_IN_PORT && resubmit->table_id == 255) {
3438             ds_put_cstr(s, "resubmit:");
3439             ofputil_format_port(resubmit->in_port, s);
3440         } else {
3441             ds_put_format(s, "resubmit(");
3442             if (resubmit->in_port != OFPP_IN_PORT) {
3443                 ofputil_format_port(resubmit->in_port, s);
3444             }
3445             ds_put_char(s, ',');
3446             if (resubmit->table_id != 255) {
3447                 ds_put_format(s, "%"PRIu8, resubmit->table_id);
3448             }
3449             ds_put_char(s, ')');
3450         }
3451         break;
3452
3453     case OFPACT_LEARN:
3454         learn_format(ofpact_get_LEARN(a), s);
3455         break;
3456
3457     case OFPACT_MULTIPATH:
3458         multipath_format(ofpact_get_MULTIPATH(a), s);
3459         break;
3460
3461     case OFPACT_NOTE:
3462         print_note(ofpact_get_NOTE(a), s);
3463         break;
3464
3465     case OFPACT_PUSH_MPLS:
3466         ds_put_format(s, "push_mpls:0x%04"PRIx16,
3467                       ntohs(ofpact_get_PUSH_MPLS(a)->ethertype));
3468         break;
3469
3470     case OFPACT_POP_MPLS:
3471         ds_put_format(s, "pop_mpls:0x%04"PRIx16,
3472                       ntohs(ofpact_get_POP_MPLS(a)->ethertype));
3473         break;
3474
3475     case OFPACT_EXIT:
3476         ds_put_cstr(s, "exit");
3477         break;
3478
3479     case OFPACT_SAMPLE:
3480         sample = ofpact_get_SAMPLE(a);
3481         ds_put_format(
3482             s, "sample(probability=%"PRIu16",collector_set_id=%"PRIu32
3483             ",obs_domain_id=%"PRIu32",obs_point_id=%"PRIu32")",
3484             sample->probability, sample->collector_set_id,
3485             sample->obs_domain_id, sample->obs_point_id);
3486         break;
3487
3488     case OFPACT_WRITE_ACTIONS: {
3489         struct ofpact_nest *on = ofpact_get_WRITE_ACTIONS(a);
3490         ds_put_format(s, "%s(",
3491                       ovs_instruction_name_from_type(
3492                           OVSINST_OFPIT11_WRITE_ACTIONS));
3493         ofpacts_format(on->actions, ofpact_nest_get_action_len(on), s);
3494         ds_put_char(s, ')');
3495         break;
3496     }
3497
3498     case OFPACT_CLEAR_ACTIONS:
3499         ds_put_format(s, "%s",
3500                       ovs_instruction_name_from_type(
3501                           OVSINST_OFPIT11_CLEAR_ACTIONS));
3502         break;
3503
3504     case OFPACT_WRITE_METADATA:
3505         metadata = ofpact_get_WRITE_METADATA(a);
3506         ds_put_format(s, "%s:%#"PRIx64,
3507                       ovs_instruction_name_from_type(
3508                           OVSINST_OFPIT11_WRITE_METADATA),
3509                       ntohll(metadata->metadata));
3510         if (metadata->mask != OVS_BE64_MAX) {
3511             ds_put_format(s, "/%#"PRIx64, ntohll(metadata->mask));
3512         }
3513         break;
3514
3515     case OFPACT_GOTO_TABLE:
3516         ds_put_format(s, "%s:%"PRIu8,
3517                       ovs_instruction_name_from_type(
3518                           OVSINST_OFPIT11_GOTO_TABLE),
3519                       ofpact_get_GOTO_TABLE(a)->table_id);
3520         break;
3521
3522     case OFPACT_METER:
3523         ds_put_format(s, "%s:%"PRIu32,
3524                       ovs_instruction_name_from_type(OVSINST_OFPIT13_METER),
3525                       ofpact_get_METER(a)->meter_id);
3526         break;
3527
3528     case OFPACT_GROUP:
3529         ds_put_format(s, "group:%"PRIu32,
3530                       ofpact_get_GROUP(a)->group_id);
3531         break;
3532     }
3533 }
3534
3535 /* Appends a string representing the 'ofpacts_len' bytes of ofpacts in
3536  * 'ofpacts' to 'string'. */
3537 void
3538 ofpacts_format(const struct ofpact *ofpacts, size_t ofpacts_len,
3539                struct ds *string)
3540 {
3541     if (!ofpacts_len) {
3542         ds_put_cstr(string, "drop");
3543     } else {
3544         const struct ofpact *a;
3545
3546         OFPACT_FOR_EACH (a, ofpacts, ofpacts_len) {
3547             if (a != ofpacts) {
3548                 ds_put_cstr(string, ",");
3549             }
3550
3551             /* XXX write-actions */
3552             ofpact_format(a, string);
3553         }
3554     }
3555 }
3556 \f
3557 /* Internal use by helpers. */
3558
3559 void *
3560 ofpact_put(struct ofpbuf *ofpacts, enum ofpact_type type, size_t len)
3561 {
3562     struct ofpact *ofpact;
3563
3564     ofpact_pad(ofpacts);
3565     ofpact = ofpacts->l2 = ofpbuf_put_uninit(ofpacts, len);
3566     ofpact_init(ofpact, type, len);
3567     return ofpact;
3568 }
3569
3570 void
3571 ofpact_init(struct ofpact *ofpact, enum ofpact_type type, size_t len)
3572 {
3573     memset(ofpact, 0, len);
3574     ofpact->type = type;
3575     ofpact->compat = OFPUTIL_ACTION_INVALID;
3576     ofpact->len = len;
3577 }
3578 \f
3579 /* Updates 'ofpact->len' to the number of bytes in the tail of 'ofpacts'
3580  * starting at 'ofpact'.
3581  *
3582  * This is the correct way to update a variable-length ofpact's length after
3583  * adding the variable-length part of the payload.  (See the large comment
3584  * near the end of ofp-actions.h for more information.) */
3585 void
3586 ofpact_update_len(struct ofpbuf *ofpacts, struct ofpact *ofpact)
3587 {
3588     ovs_assert(ofpact == ofpacts->l2);
3589     ofpact->len = (char *) ofpbuf_tail(ofpacts) - (char *) ofpact;
3590 }
3591
3592 /* Pads out 'ofpacts' to a multiple of OFPACT_ALIGNTO bytes in length.  Each
3593  * ofpact_put_<ENUM>() calls this function automatically beforehand, but the
3594  * client must call this itself after adding the final ofpact to an array of
3595  * them.
3596  *
3597  * (The consequences of failing to call this function are probably not dire.
3598  * OFPACT_FOR_EACH will calculate a pointer beyond the end of the ofpacts, but
3599  * not dereference it.  That's undefined behavior, technically, but it will not
3600  * cause a real problem on common systems.  Still, it seems better to call
3601  * it.) */
3602 void
3603 ofpact_pad(struct ofpbuf *ofpacts)
3604 {
3605     unsigned int rem = ofpacts->size % OFPACT_ALIGNTO;
3606     if (rem) {
3607         ofpbuf_put_zeros(ofpacts, OFPACT_ALIGNTO - rem);
3608     }
3609 }