lib/ofp-parse.c

   1 /*
   2  * Copyright (c) 2010, 2011, 2012 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
  19 #include "ofp-parse.h"
  20
  21 #include <ctype.h>
  22 #include <errno.h>
  23 #include <stdlib.h>
  24
  25 #include "bundle.h"
  26 #include "byte-order.h"
  27 #include "dynamic-string.h"
  28 #include "learn.h"
  29 #include "meta-flow.h"
  30 #include "multipath.h"
  31 #include "netdev.h"
  32 #include "nx-match.h"
  33 #include "ofp-actions.h"
  34 #include "ofp-util.h"
  35 #include "ofpbuf.h"
  36 #include "openflow/openflow.h"
  37 #include "packets.h"
  38 #include "socket-util.h"
  39 #include "vconn.h"
  40 #include "vlog.h"
  41
  42 VLOG_DEFINE_THIS_MODULE(ofp_parse);
  43
  44 static void ofp_fatal(const char *flow, bool verbose, const char *format, ...)
  45     NO_RETURN;
  46
  47 static uint8_t
  48 str_to_u8(const char *str, const char *name)
  49 {
  50     int value;
  51
  52     if (!str_to_int(str, 10, &value) || value < 0 || value > 255) {
  53         ovs_fatal(0, "invalid %s \"%s\"", name, str);
  54     }
  55     return value;
  56 }
  57
  58 static uint16_t
  59 str_to_u16(const char *str, const char *name)
  60 {
  61     int value;
  62
  63     if (!str_to_int(str, 0, &value) || value < 0 || value > 65535) {
  64         ovs_fatal(0, "invalid %s \"%s\"", name, str);
  65     }
  66     return value;
  67 }
  68
  69 static uint32_t
  70 str_to_u32(const char *str)
  71 {
  72     char *tail;
  73     uint32_t value;
  74
  75     if (!str[0]) {
  76         ovs_fatal(0, "missing required numeric argument");
  77     }
  78
  79     errno = 0;
  80     value = strtoul(str, &tail, 0);
  81     if (errno == EINVAL || errno == ERANGE || *tail) {
  82         ovs_fatal(0, "invalid numeric format %s", str);
  83     }
  84     return value;
  85 }
  86
  87 static uint64_t
  88 str_to_u64(const char *str)
  89 {
  90     char *tail;
  91     uint64_t value;
  92
  93     if (!str[0]) {
  94         ovs_fatal(0, "missing required numeric argument");
  95     }
  96
  97     errno = 0;
  98     value = strtoull(str, &tail, 0);
  99     if (errno == EINVAL || errno == ERANGE || *tail) {
 100         ovs_fatal(0, "invalid numeric format %s", str);
 101     }
 102     return value;
 103 }
 104
 105 static void
 106 str_to_mac(const char *str, uint8_t mac[6])
 107 {
 108     if (sscanf(str, ETH_ADDR_SCAN_FMT, ETH_ADDR_SCAN_ARGS(mac))
 109         != ETH_ADDR_SCAN_COUNT) {
 110         ovs_fatal(0, "invalid mac address %s", str);
 111     }
 112 }
 113
 114 static void
 115 str_to_ip(const char *str, ovs_be32 *ip)
 116 {
 117     struct in_addr in_addr;
 118
 119     if (lookup_ip(str, &in_addr)) {
 120         ovs_fatal(0, "%s: could not convert to IP address", str);
 121     }
 122     *ip = in_addr.s_addr;
 123 }
 124
 125 static void
 126 parse_enqueue(char *arg, struct ofpbuf *ofpacts)
 127 {
 128     char *sp = NULL;
 129     char *port = strtok_r(arg, ":q", &sp);
 130     char *queue = strtok_r(NULL, "", &sp);
 131     struct ofpact_enqueue *enqueue;
 132
 133     if (port == NULL || queue == NULL) {
 134         ovs_fatal(0, "\"enqueue\" syntax is \"enqueue:PORT:QUEUE\"");
 135     }
 136
 137     enqueue = ofpact_put_ENQUEUE(ofpacts);
 138     enqueue->port = u16_to_ofp(str_to_u32(port));
 139     enqueue->queue = str_to_u32(queue);
 140 }
 141
 142 static void
 143 parse_output(char *arg, struct ofpbuf *ofpacts)
 144 {
 145     if (strchr(arg, '[')) {
 146         struct ofpact_output_reg *output_reg;
 147
 148         output_reg = ofpact_put_OUTPUT_REG(ofpacts);
 149         mf_parse_subfield(&output_reg->src, arg);
 150         output_reg->max_len = UINT16_MAX;
 151     } else {
 152         struct ofpact_output *output;
 153
 154         output = ofpact_put_OUTPUT(ofpacts);
 155         output->port = u16_to_ofp(str_to_u32(arg));
 156         output->max_len = output->port == OFPP_CONTROLLER ? UINT16_MAX : 0;
 157     }
 158 }
 159
 160 static void
 161 parse_resubmit(char *arg, struct ofpbuf *ofpacts)
 162 {
 163     struct ofpact_resubmit *resubmit;
 164     char *in_port_s, *table_s;
 165
 166     resubmit = ofpact_put_RESUBMIT(ofpacts);
 167
 168     in_port_s = strsep(&arg, ",");
 169     if (in_port_s && in_port_s[0]) {
 170         if (!ofputil_port_from_string(in_port_s, &resubmit->in_port)) {
 171             ovs_fatal(0, "%s: resubmit to unknown port", in_port_s);
 172         }
 173     } else {
 174         resubmit->in_port = OFPP_IN_PORT;
 175     }
 176
 177     table_s = strsep(&arg, ",");
 178     resubmit->table_id = table_s && table_s[0] ? str_to_u32(table_s) : 255;
 179
 180     if (resubmit->in_port == OFPP_IN_PORT && resubmit->table_id == 255) {
 181         ovs_fatal(0, "at least one \"in_port\" or \"table\" must be specified "
 182                   " on resubmit");
 183     }
 184 }
 185
 186 static void
 187 parse_note(const char *arg, struct ofpbuf *ofpacts)
 188 {
 189     struct ofpact_note *note;
 190
 191     note = ofpact_put_NOTE(ofpacts);
 192     while (*arg != '\0') {
 193         uint8_t byte;
 194         bool ok;
 195
 196         if (*arg == '.') {
 197             arg++;
 198         }
 199         if (*arg == '\0') {
 200             break;
 201         }
 202
 203         byte = hexits_value(arg, 2, &ok);
 204         if (!ok) {
 205             ovs_fatal(0, "bad hex digit in `note' argument");
 206         }
 207         ofpbuf_put(ofpacts, &byte, 1);
 208
 209         note = ofpacts->l2;
 210         note->length++;
 211
 212         arg += 2;
 213     }
 214     ofpact_update_len(ofpacts, &note->ofpact);
 215 }
 216
 217 static void
 218 parse_fin_timeout(struct ofpbuf *b, char *arg)
 219 {
 220     struct ofpact_fin_timeout *oft = ofpact_put_FIN_TIMEOUT(b);
 221     char *key, *value;
 222
 223     while (ofputil_parse_key_value(&arg, &key, &value)) {
 224         if (!strcmp(key, "idle_timeout")) {
 225             oft->fin_idle_timeout = str_to_u16(value, key);
 226         } else if (!strcmp(key, "hard_timeout")) {
 227             oft->fin_hard_timeout = str_to_u16(value, key);
 228         } else {
 229             ovs_fatal(0, "invalid key '%s' in 'fin_timeout' argument", key);
 230         }
 231     }
 232 }
 233
 234 static void
 235 parse_controller(struct ofpbuf *b, char *arg)
 236 {
 237     enum ofp_packet_in_reason reason = OFPR_ACTION;
 238     uint16_t controller_id = 0;
 239     uint16_t max_len = UINT16_MAX;
 240
 241     if (!arg[0]) {
 242         /* Use defaults. */
 243     } else if (strspn(arg, "0123456789") == strlen(arg)) {
 244         max_len = str_to_u16(arg, "max_len");
 245     } else {
 246         char *name, *value;
 247
 248         while (ofputil_parse_key_value(&arg, &name, &value)) {
 249             if (!strcmp(name, "reason")) {
 250                 if (!ofputil_packet_in_reason_from_string(value, &reason)) {
 251                     ovs_fatal(0, "unknown reason \"%s\"", value);
 252                 }
 253             } else if (!strcmp(name, "max_len")) {
 254                 max_len = str_to_u16(value, "max_len");
 255             } else if (!strcmp(name, "id")) {
 256                 controller_id = str_to_u16(value, "id");
 257             } else {
 258                 ovs_fatal(0, "unknown key \"%s\" parsing controller action",
 259                           name);
 260             }
 261         }
 262     }
 263
 264     if (reason == OFPR_ACTION && controller_id == 0) {
 265         struct ofpact_output *output;
 266
 267         output = ofpact_put_OUTPUT(b);
 268         output->port = OFPP_CONTROLLER;
 269         output->max_len = max_len;
 270     } else {
 271         struct ofpact_controller *controller;
 272
 273         controller = ofpact_put_CONTROLLER(b);
 274         controller->max_len = max_len;
 275         controller->reason = reason;
 276         controller->controller_id = controller_id;
 277     }
 278 }
 279
 280 static void
 281 parse_noargs_dec_ttl(struct ofpbuf *b)
 282 {
 283     struct ofpact_cnt_ids *ids;
 284     uint16_t id = 0;
 285
 286     ids = ofpact_put_DEC_TTL(b);
 287     ofpbuf_put(b, &id, sizeof id);
 288     ids = b->l2;
 289     ids->n_controllers++;
 290     ofpact_update_len(b, &ids->ofpact);
 291 }
 292
 293 static void
 294 parse_dec_ttl(struct ofpbuf *b, char *arg)
 295 {
 296     if (*arg == '\0') {
 297         parse_noargs_dec_ttl(b);
 298     } else {
 299         struct ofpact_cnt_ids *ids;
 300         char *cntr;
 301
 302         ids = ofpact_put_DEC_TTL(b);
 303         ids->ofpact.compat = OFPUTIL_NXAST_DEC_TTL_CNT_IDS;
 304         for (cntr = strtok_r(arg, ", ", &arg); cntr != NULL;
 305              cntr = strtok_r(NULL, ", ", &arg)) {
 306             uint16_t id = atoi(cntr);
 307
 308             ofpbuf_put(b, &id, sizeof id);
 309             ids = b->l2;
 310             ids->n_controllers++;
 311         }
 312         if (!ids->n_controllers) {
 313             ovs_fatal(0, "dec_ttl_cnt_ids: expected at least one controller "
 314                       "id.");
 315         }
 316         ofpact_update_len(b, &ids->ofpact);
 317     }
 318 }
 319
 320 static void
 321 parse_set_mpls_ttl(struct ofpbuf *b, const char *arg)
 322 {
 323     struct ofpact_mpls_ttl *mpls_ttl = ofpact_put_SET_MPLS_TTL(b);
 324
 325     if (*arg == '\0') {
 326         ovs_fatal(0, "parse_set_mpls_ttl: expected ttl.");
 327     }
 328
 329     mpls_ttl->ttl = atoi(arg);
 330 }
 331
 332 static void
 333 set_field_parse(const char *arg, struct ofpbuf *ofpacts)
 334 {
 335     char *orig = xstrdup(arg);
 336     struct ofpact_reg_load *load = ofpact_put_REG_LOAD(ofpacts);
 337     char *value;
 338     char *delim;
 339     char *key;
 340     const struct mf_field *mf;
 341     const char *error;
 342     union mf_value mf_value;
 343
 344     value = orig;
 345     delim = strstr(orig, "->");
 346     if (!delim) {
 347         ovs_fatal(0, "%s: missing `->'", orig);
 348     }
 349     if (strlen(delim) <= strlen("->")) {
 350         ovs_fatal(0, "%s: missing field name following `->'", orig);
 351     }
 352
 353     key = delim + strlen("->");
 354     mf = mf_from_name(key);
 355     if (!mf) {
 356         ovs_fatal(0, "%s is not valid oxm field name", key);
 357     }
 358     if (!mf->writable) {
 359         ovs_fatal(0, "%s is not allowed to set", key);
 360     }
 361
 362     delim[0] = '\0';
 363     error = mf_parse_value(mf, value, &mf_value);
 364     if (error) {
 365         ovs_fatal(0, "%s", error);
 366     }
 367     if (!mf_is_value_valid(mf, &mf_value)) {
 368         ovs_fatal(0, "%s is not valid valid for field %s", value, key);
 369     }
 370     ofpact_set_field_init(load, mf, &mf_value);
 371     free(orig);
 372 }
 373
 374 static void
 375 parse_metadata(struct ofpbuf *b, char *arg)
 376 {
 377     struct ofpact_metadata *om;
 378     char *mask = strchr(arg, '/');
 379
 380     om = ofpact_put_WRITE_METADATA(b);
 381
 382     if (mask) {
 383         *mask = '\0';
 384         om->mask = htonll(str_to_u64(mask + 1));
 385     } else {
 386         om->mask = htonll(UINT64_MAX);
 387     }
 388
 389     om->metadata = htonll(str_to_u64(arg));
 390 }
 391
 392 static void
 393 parse_sample(struct ofpbuf *b, char *arg)
 394 {
 395     struct ofpact_sample *os = ofpact_put_SAMPLE(b);
 396     char *key, *value;
 397
 398     while (ofputil_parse_key_value(&arg, &key, &value)) {
 399         if (!strcmp(key, "probability")) {
 400             os->probability = str_to_u16(value, "probability");
 401             if (os->probability == 0) {
 402                 ovs_fatal(0, "invalid probability value \"%s\"", value);
 403             }
 404         } else if (!strcmp(key, "collector_set_id")) {
 405             os->collector_set_id = str_to_u32(value);
 406         } else if (!strcmp(key, "obs_domain_id")) {
 407             os->obs_domain_id = str_to_u32(value);
 408         } else if (!strcmp(key, "obs_point_id")) {
 409             os->obs_point_id = str_to_u32(value);
 410         } else {
 411             ovs_fatal(0, "invalid key \"%s\" in \"sample\" argument",
 412                       key);
 413         }
 414     }
 415     if (os->probability == 0) {
 416         ovs_fatal(0, "non-zero \"probability\" must be specified on sample");
 417     }
 418 }
 419
 420 static void
 421 parse_named_action(enum ofputil_action_code code,
 422                    char *arg, struct ofpbuf *ofpacts)
 423 {
 424     struct ofpact_tunnel *tunnel;
 425     uint16_t vid;
 426     uint16_t ethertype;
 427     ovs_be32 ip;
 428     uint8_t pcp;
 429     uint8_t tos;
 430
 431     switch (code) {
 432     case OFPUTIL_ACTION_INVALID:
 433         NOT_REACHED();
 434
 435     case OFPUTIL_OFPAT10_OUTPUT:
 436     case OFPUTIL_OFPAT11_OUTPUT:
 437         parse_output(arg, ofpacts);
 438         break;
 439
 440     case OFPUTIL_OFPAT10_SET_VLAN_VID:
 441     case OFPUTIL_OFPAT11_SET_VLAN_VID:
 442         vid = str_to_u32(arg);
 443         if (vid & ~VLAN_VID_MASK) {
 444             ovs_fatal(0, "%s: not a valid VLAN VID", arg);
 445         }
 446         ofpact_put_SET_VLAN_VID(ofpacts)->vlan_vid = vid;
 447         break;
 448
 449     case OFPUTIL_OFPAT10_SET_VLAN_PCP:
 450     case OFPUTIL_OFPAT11_SET_VLAN_PCP:
 451         pcp = str_to_u32(arg);
 452         if (pcp & ~7) {
 453             ovs_fatal(0, "%s: not a valid VLAN PCP", arg);
 454         }
 455         ofpact_put_SET_VLAN_PCP(ofpacts)->vlan_pcp = pcp;
 456         break;
 457
 458     case OFPUTIL_OFPAT12_SET_FIELD:
 459         set_field_parse(arg, ofpacts);
 460         break;
 461
 462     case OFPUTIL_OFPAT10_STRIP_VLAN:
 463     case OFPUTIL_OFPAT11_POP_VLAN:
 464         ofpact_put_STRIP_VLAN(ofpacts);
 465         break;
 466
 467     case OFPUTIL_OFPAT11_PUSH_VLAN:
 468         ethertype = str_to_u16(arg, "ethertype");
 469         if (ethertype != ETH_TYPE_VLAN_8021Q) {
 470             /* XXX ETH_TYPE_VLAN_8021AD case isn't supported */
 471             ovs_fatal(0, "%s: not a valid VLAN ethertype", arg);
 472         }
 473         ofpact_put_PUSH_VLAN(ofpacts);
 474         break;
 475
 476     case OFPUTIL_OFPAT11_SET_QUEUE:
 477         ofpact_put_SET_QUEUE(ofpacts)->queue_id = str_to_u32(arg);
 478         break;
 479
 480
 481     case OFPUTIL_OFPAT10_SET_DL_SRC:
 482     case OFPUTIL_OFPAT11_SET_DL_SRC:
 483         str_to_mac(arg, ofpact_put_SET_ETH_SRC(ofpacts)->mac);
 484         break;
 485
 486     case OFPUTIL_OFPAT10_SET_DL_DST:
 487     case OFPUTIL_OFPAT11_SET_DL_DST:
 488         str_to_mac(arg, ofpact_put_SET_ETH_DST(ofpacts)->mac);
 489         break;
 490
 491     case OFPUTIL_OFPAT10_SET_NW_SRC:
 492     case OFPUTIL_OFPAT11_SET_NW_SRC:
 493         str_to_ip(arg, &ip);
 494         ofpact_put_SET_IPV4_SRC(ofpacts)->ipv4 = ip;
 495         break;
 496
 497     case OFPUTIL_OFPAT10_SET_NW_DST:
 498     case OFPUTIL_OFPAT11_SET_NW_DST:
 499         str_to_ip(arg, &ip);
 500         ofpact_put_SET_IPV4_DST(ofpacts)->ipv4 = ip;
 501         break;
 502
 503     case OFPUTIL_OFPAT10_SET_NW_TOS:
 504     case OFPUTIL_OFPAT11_SET_NW_TOS:
 505         tos = str_to_u32(arg);
 506         if (tos & ~IP_DSCP_MASK) {
 507             ovs_fatal(0, "%s: not a valid TOS", arg);
 508         }
 509         ofpact_put_SET_IPV4_DSCP(ofpacts)->dscp = tos;
 510         break;
 511
 512     case OFPUTIL_OFPAT11_DEC_NW_TTL:
 513         NOT_REACHED();
 514
 515     case OFPUTIL_OFPAT10_SET_TP_SRC:
 516     case OFPUTIL_OFPAT11_SET_TP_SRC:
 517         ofpact_put_SET_L4_SRC_PORT(ofpacts)->port = str_to_u32(arg);
 518         break;
 519
 520     case OFPUTIL_OFPAT10_SET_TP_DST:
 521     case OFPUTIL_OFPAT11_SET_TP_DST:
 522         ofpact_put_SET_L4_DST_PORT(ofpacts)->port = str_to_u32(arg);
 523         break;
 524
 525     case OFPUTIL_OFPAT10_ENQUEUE:
 526         parse_enqueue(arg, ofpacts);
 527         break;
 528
 529     case OFPUTIL_NXAST_RESUBMIT:
 530         parse_resubmit(arg, ofpacts);
 531         break;
 532
 533     case OFPUTIL_NXAST_SET_TUNNEL:
 534     case OFPUTIL_NXAST_SET_TUNNEL64:
 535         tunnel = ofpact_put_SET_TUNNEL(ofpacts);
 536         tunnel->ofpact.compat = code;
 537         tunnel->tun_id = str_to_u64(arg);
 538         break;
 539
 540     case OFPUTIL_NXAST_WRITE_METADATA:
 541         parse_metadata(ofpacts, arg);
 542         break;
 543
 544     case OFPUTIL_NXAST_SET_QUEUE:
 545         ofpact_put_SET_QUEUE(ofpacts)->queue_id = str_to_u32(arg);
 546         break;
 547
 548     case OFPUTIL_NXAST_POP_QUEUE:
 549         ofpact_put_POP_QUEUE(ofpacts);
 550         break;
 551
 552     case OFPUTIL_NXAST_REG_MOVE:
 553         nxm_parse_reg_move(ofpact_put_REG_MOVE(ofpacts), arg);
 554         break;
 555
 556     case OFPUTIL_NXAST_REG_LOAD:
 557         nxm_parse_reg_load(ofpact_put_REG_LOAD(ofpacts), arg);
 558         break;
 559
 560     case OFPUTIL_NXAST_NOTE:
 561         parse_note(arg, ofpacts);
 562         break;
 563
 564     case OFPUTIL_NXAST_MULTIPATH:
 565         multipath_parse(ofpact_put_MULTIPATH(ofpacts), arg);
 566         break;
 567
 568     case OFPUTIL_NXAST_BUNDLE:
 569         bundle_parse(arg, ofpacts);
 570         break;
 571
 572     case OFPUTIL_NXAST_BUNDLE_LOAD:
 573         bundle_parse_load(arg, ofpacts);
 574         break;
 575
 576     case OFPUTIL_NXAST_RESUBMIT_TABLE:
 577     case OFPUTIL_NXAST_OUTPUT_REG:
 578     case OFPUTIL_NXAST_DEC_TTL_CNT_IDS:
 579         NOT_REACHED();
 580
 581     case OFPUTIL_NXAST_LEARN:
 582         learn_parse(arg, ofpacts);
 583         break;
 584
 585     case OFPUTIL_NXAST_EXIT:
 586         ofpact_put_EXIT(ofpacts);
 587         break;
 588
 589     case OFPUTIL_NXAST_DEC_TTL:
 590         parse_dec_ttl(ofpacts, arg);
 591         break;
 592
 593     case OFPUTIL_NXAST_SET_MPLS_TTL:
 594     case OFPUTIL_OFPAT11_SET_MPLS_TTL:
 595         parse_set_mpls_ttl(ofpacts, arg);
 596         break;
 597
 598     case OFPUTIL_OFPAT11_DEC_MPLS_TTL:
 599     case OFPUTIL_NXAST_DEC_MPLS_TTL:
 600         ofpact_put_DEC_MPLS_TTL(ofpacts);
 601         break;
 602
 603     case OFPUTIL_NXAST_FIN_TIMEOUT:
 604         parse_fin_timeout(ofpacts, arg);
 605         break;
 606
 607     case OFPUTIL_NXAST_CONTROLLER:
 608         parse_controller(ofpacts, arg);
 609         break;
 610
 611     case OFPUTIL_OFPAT11_PUSH_MPLS:
 612     case OFPUTIL_NXAST_PUSH_MPLS:
 613         ofpact_put_PUSH_MPLS(ofpacts)->ethertype =
 614             htons(str_to_u16(arg, "push_mpls"));
 615         break;
 616
 617     case OFPUTIL_OFPAT11_POP_MPLS:
 618     case OFPUTIL_NXAST_POP_MPLS:
 619         ofpact_put_POP_MPLS(ofpacts)->ethertype =
 620             htons(str_to_u16(arg, "pop_mpls"));
 621         break;
 622
 623     case OFPUTIL_NXAST_STACK_PUSH:
 624         nxm_parse_stack_action(ofpact_put_STACK_PUSH(ofpacts), arg);
 625         break;
 626     case OFPUTIL_NXAST_STACK_POP:
 627         nxm_parse_stack_action(ofpact_put_STACK_POP(ofpacts), arg);
 628         break;
 629
 630     case OFPUTIL_NXAST_SAMPLE:
 631         parse_sample(ofpacts, arg);
 632         break;
 633     }
 634 }
 635
 636 static bool
 637 str_to_ofpact__(char *pos, char *act, char *arg,
 638                 struct ofpbuf *ofpacts, int n_actions)
 639 {
 640     int code = ofputil_action_code_from_name(act);
 641     if (code >= 0) {
 642         parse_named_action(code, arg, ofpacts);
 643     } else if (!strcasecmp(act, "drop")) {
 644         if (n_actions) {
 645             ovs_fatal(0, "Drop actions must not be preceded by other "
 646                       "actions");
 647         } else if (ofputil_parse_key_value(&pos, &act, &arg)) {
 648             ovs_fatal(0, "Drop actions must not be followed by other "
 649                       "actions");
 650         }
 651         return false;
 652     } else {
 653         ofp_port_t port;
 654         if (ofputil_port_from_string(act, &port)) {
 655             ofpact_put_OUTPUT(ofpacts)->port = port;
 656         } else {
 657             ovs_fatal(0, "Unknown action: %s", act);
 658         }
 659     }
 660
 661     return true;
 662 }
 663
 664 static void
 665 str_to_ofpacts(char *str, struct ofpbuf *ofpacts)
 666 {
 667     char *pos, *act, *arg;
 668     enum ofperr error;
 669     int n_actions;
 670
 671     pos = str;
 672     n_actions = 0;
 673     while (ofputil_parse_key_value(&pos, &act, &arg)) {
 674         if (!str_to_ofpact__(pos, act, arg, ofpacts, n_actions)) {
 675             break;
 676         }
 677         n_actions++;
 678     }
 679
 680     error = ofpacts_verify(ofpacts->data, ofpacts->size);
 681     if (error) {
 682         ovs_fatal(0, "Incorrect action ordering");
 683     }
 684
 685     ofpact_pad(ofpacts);
 686 }
 687
 688 static void
 689 parse_named_instruction(enum ovs_instruction_type type,
 690                         char *arg, struct ofpbuf *ofpacts)
 691 {
 692     enum ofperr error;
 693
 694     switch (type) {
 695     case OVSINST_OFPIT11_APPLY_ACTIONS:
 696         NOT_REACHED();  /* This case is handled by str_to_inst_ofpacts() */
 697         break;
 698
 699     case OVSINST_OFPIT11_WRITE_ACTIONS:
 700         /* XXX */
 701         ovs_fatal(0, "instruction write-actions is not supported yet");
 702         break;
 703
 704     case OVSINST_OFPIT11_CLEAR_ACTIONS:
 705         ofpact_put_CLEAR_ACTIONS(ofpacts);
 706         break;
 707
 708     case OVSINST_OFPIT13_METER:
 709         ofpact_put_METER(ofpacts)->meter_id = str_to_u32(arg);
 710         break;
 711
 712     case OVSINST_OFPIT11_WRITE_METADATA:
 713         parse_metadata(ofpacts, arg);
 714         break;
 715
 716     case OVSINST_OFPIT11_GOTO_TABLE: {
 717         struct ofpact_goto_table *ogt = ofpact_put_GOTO_TABLE(ofpacts);
 718         char *table_s = strsep(&arg, ",");
 719         if (!table_s || !table_s[0]) {
 720             ovs_fatal(0, "instruction goto-table needs table id");
 721         }
 722         ogt->table_id = str_to_u8(table_s, "table");
 723         break;
 724     }
 725     }
 726
 727     /* If write_metadata is specified as an action AND an instruction, ofpacts
 728        could be invalid. */
 729     error = ofpacts_verify(ofpacts->data, ofpacts->size);
 730     if (error) {
 731         ovs_fatal(0, "Incorrect instruction ordering");
 732     }
 733 }
 734
 735 static void
 736 str_to_inst_ofpacts(char *str, struct ofpbuf *ofpacts)
 737 {
 738     char *pos, *inst, *arg;
 739     int type;
 740     const char *prev_inst = NULL;
 741     int prev_type = -1;
 742     int n_actions = 0;
 743
 744     pos = str;
 745     while (ofputil_parse_key_value(&pos, &inst, &arg)) {
 746         type = ofpact_instruction_type_from_name(inst);
 747         if (type < 0) {
 748             if (!str_to_ofpact__(pos, inst, arg, ofpacts, n_actions)) {
 749                 break;
 750             }
 751
 752             type = OVSINST_OFPIT11_APPLY_ACTIONS;
 753             if (prev_type == type) {
 754                 n_actions++;
 755                 continue;
 756             }
 757         } else if (type == OVSINST_OFPIT11_APPLY_ACTIONS) {
 758             ovs_fatal(0, "%s isn't supported. Just write actions then "
 759                       "it is interpreted as apply_actions", inst);
 760         } else {
 761             parse_named_instruction(type, arg, ofpacts);
 762         }
 763
 764         if (type == prev_type) {
 765             ovs_fatal(0, "instruction can be specified at most once: %s",
 766                       inst);
 767         }
 768         if (type <= prev_type) {
 769             ovs_fatal(0, "Instruction %s must be specified before %s",
 770                       inst, prev_inst);
 771         }
 772
 773         prev_inst = inst;
 774         prev_type = type;
 775         n_actions++;
 776     }
 777     ofpact_pad(ofpacts);
 778 }
 779
 780 struct protocol {
 781     const char *name;
 782     uint16_t dl_type;
 783     uint8_t nw_proto;
 784 };
 785
 786 static bool
 787 parse_protocol(const char *name, const struct protocol **p_out)
 788 {
 789     static const struct protocol protocols[] = {
 790         { "ip", ETH_TYPE_IP, 0 },
 791         { "arp", ETH_TYPE_ARP, 0 },
 792         { "icmp", ETH_TYPE_IP, IPPROTO_ICMP },
 793         { "tcp", ETH_TYPE_IP, IPPROTO_TCP },
 794         { "udp", ETH_TYPE_IP, IPPROTO_UDP },
 795         { "ipv6", ETH_TYPE_IPV6, 0 },
 796         { "ip6", ETH_TYPE_IPV6, 0 },
 797         { "icmp6", ETH_TYPE_IPV6, IPPROTO_ICMPV6 },
 798         { "tcp6", ETH_TYPE_IPV6, IPPROTO_TCP },
 799         { "udp6", ETH_TYPE_IPV6, IPPROTO_UDP },
 800         { "rarp", ETH_TYPE_RARP, 0},
 801         { "mpls", ETH_TYPE_MPLS, 0 },
 802         { "mplsm", ETH_TYPE_MPLS_MCAST, 0 },
 803     };
 804     const struct protocol *p;
 805
 806     for (p = protocols; p < &protocols[ARRAY_SIZE(protocols)]; p++) {
 807         if (!strcmp(p->name, name)) {
 808             *p_out = p;
 809             return true;
 810         }
 811     }
 812     *p_out = NULL;
 813     return false;
 814 }
 815
 816 static void
 817 ofp_fatal(const char *flow, bool verbose, const char *format, ...)
 818 {
 819     va_list args;
 820
 821     if (verbose) {
 822         fprintf(stderr, "%s:\n", flow);
 823     }
 824
 825     va_start(args, format);
 826     ovs_fatal_valist(0, format, args);
 827 }
 828
 829 static void
 830 parse_field(const struct mf_field *mf, const char *s, struct match *match)
 831 {
 832     union mf_value value, mask;
 833     char *error;
 834
 835     error = mf_parse(mf, s, &value, &mask);
 836     if (error) {
 837         ovs_fatal(0, "%s", error);
 838     }
 839
 840     mf_set(mf, &value, &mask, match);
 841 }
 842
 843 /* Convert 'str_' (as described in the Flow Syntax section of the ovs-ofctl man
 844  * page) into 'fm' for sending the specified flow_mod 'command' to a switch.
 845  * If 'actions' is specified, an action must be in 'string' and may be expanded
 846  * or reallocated.
 847  *
 848  * To parse syntax for an OFPT_FLOW_MOD (or NXT_FLOW_MOD), use an OFPFC_*
 849  * constant for 'command'.  To parse syntax for an OFPST_FLOW or
 850  * OFPST_AGGREGATE (or NXST_FLOW or NXST_AGGREGATE), use -1 for 'command'. */
 851 void
 852 parse_ofp_str(struct ofputil_flow_mod *fm, int command, const char *str_,
 853               bool verbose)
 854 {
 855     enum {
 856         F_OUT_PORT = 1 << 0,
 857         F_ACTIONS = 1 << 1,
 858         F_TIMEOUT = 1 << 3,
 859         F_PRIORITY = 1 << 4,
 860         F_FLAGS = 1 << 5,
 861     } fields;
 862     char *string = xstrdup(str_);
 863     char *save_ptr = NULL;
 864     char *act_str = NULL;
 865     char *name;
 866
 867     switch (command) {
 868     case -1:
 869         fields = F_OUT_PORT;
 870         break;
 871
 872     case OFPFC_ADD:
 873         fields = F_ACTIONS | F_TIMEOUT | F_PRIORITY | F_FLAGS;
 874         break;
 875
 876     case OFPFC_DELETE:
 877         fields = F_OUT_PORT;
 878         break;
 879
 880     case OFPFC_DELETE_STRICT:
 881         fields = F_OUT_PORT | F_PRIORITY;
 882         break;
 883
 884     case OFPFC_MODIFY:
 885         fields = F_ACTIONS | F_TIMEOUT | F_PRIORITY | F_FLAGS;
 886         break;
 887
 888     case OFPFC_MODIFY_STRICT:
 889         fields = F_ACTIONS | F_TIMEOUT | F_PRIORITY | F_FLAGS;
 890         break;
 891
 892     default:
 893         NOT_REACHED();
 894     }
 895
 896     match_init_catchall(&fm->match);
 897     fm->priority = OFP_DEFAULT_PRIORITY;
 898     fm->cookie = htonll(0);
 899     fm->cookie_mask = htonll(0);
 900     if (command == OFPFC_MODIFY || command == OFPFC_MODIFY_STRICT) {
 901         /* For modify, by default, don't update the cookie. */
 902         fm->new_cookie = htonll(UINT64_MAX);
 903     } else{
 904         fm->new_cookie = htonll(0);
 905     }
 906     fm->table_id = 0xff;
 907     fm->command = command;
 908     fm->idle_timeout = OFP_FLOW_PERMANENT;
 909     fm->hard_timeout = OFP_FLOW_PERMANENT;
 910     fm->buffer_id = UINT32_MAX;
 911     fm->out_port = OFPP_ANY;
 912     fm->flags = 0;
 913     if (fields & F_ACTIONS) {
 914         act_str = strstr(string, "action");
 915         if (!act_str) {
 916             ofp_fatal(str_, verbose, "must specify an action");
 917         }
 918         *act_str = '\0';
 919
 920         act_str = strchr(act_str + 1, '=');
 921         if (!act_str) {
 922             ofp_fatal(str_, verbose, "must specify an action");
 923         }
 924
 925         act_str++;
 926     }
 927     for (name = strtok_r(string, "=, \t\r\n", &save_ptr); name;
 928          name = strtok_r(NULL, "=, \t\r\n", &save_ptr)) {
 929         const struct protocol *p;
 930
 931         if (parse_protocol(name, &p)) {
 932             match_set_dl_type(&fm->match, htons(p->dl_type));
 933             if (p->nw_proto) {
 934                 match_set_nw_proto(&fm->match, p->nw_proto);
 935             }
 936         } else if (fields & F_FLAGS && !strcmp(name, "send_flow_rem")) {
 937             fm->flags |= OFPFF_SEND_FLOW_REM;
 938         } else if (fields & F_FLAGS && !strcmp(name, "check_overlap")) {
 939             fm->flags |= OFPFF_CHECK_OVERLAP;
 940         } else if (fields & F_FLAGS && !strcmp(name, "reset_counts")) {
 941             fm->flags |= OFPFF12_RESET_COUNTS;
 942         } else if (fields & F_FLAGS && !strcmp(name, "no_packet_counts")) {
 943             fm->flags |= OFPFF13_NO_PKT_COUNTS;
 944         } else if (fields & F_FLAGS && !strcmp(name, "no_byte_counts")) {
 945             fm->flags |= OFPFF13_NO_BYT_COUNTS;
 946         } else {
 947             char *value;
 948
 949             value = strtok_r(NULL, ", \t\r\n", &save_ptr);
 950             if (!value) {
 951                 ofp_fatal(str_, verbose, "field %s missing value", name);
 952             }
 953
 954             if (!strcmp(name, "table")) {
 955                 fm->table_id = str_to_u8(value, name);
 956             } else if (!strcmp(name, "out_port")) {
 957                 if (!ofputil_port_from_string(name, &fm->out_port)) {
 958                     ofp_fatal(str_, verbose, "%s is not a valid OpenFlow port",
 959                               name);
 960                 }
 961             } else if (fields & F_PRIORITY && !strcmp(name, "priority")) {
 962                 fm->priority = str_to_u16(value, name);
 963             } else if (fields & F_TIMEOUT && !strcmp(name, "idle_timeout")) {
 964                 fm->idle_timeout = str_to_u16(value, name);
 965             } else if (fields & F_TIMEOUT && !strcmp(name, "hard_timeout")) {
 966                 fm->hard_timeout = str_to_u16(value, name);
 967             } else if (!strcmp(name, "cookie")) {
 968                 char *mask = strchr(value, '/');
 969
 970                 if (mask) {
 971                     /* A mask means we're searching for a cookie. */
 972                     if (command == OFPFC_ADD) {
 973                         ofp_fatal(str_, verbose, "flow additions cannot use "
 974                                   "a cookie mask");
 975                     }
 976                     *mask = '\0';
 977                     fm->cookie = htonll(str_to_u64(value));
 978                     fm->cookie_mask = htonll(str_to_u64(mask+1));
 979                 } else {
 980                     /* No mask means that the cookie is being set. */
 981                     if (command != OFPFC_ADD && command != OFPFC_MODIFY
 982                             && command != OFPFC_MODIFY_STRICT) {
 983                         ofp_fatal(str_, verbose, "cannot set cookie");
 984                     }
 985                     fm->new_cookie = htonll(str_to_u64(value));
 986                 }
 987             } else if (mf_from_name(name)) {
 988                 parse_field(mf_from_name(name), value, &fm->match);
 989             } else if (!strcmp(name, "duration")
 990                        || !strcmp(name, "n_packets")
 991                        || !strcmp(name, "n_bytes")
 992                        || !strcmp(name, "idle_age")
 993                        || !strcmp(name, "hard_age")) {
 994                 /* Ignore these, so that users can feed the output of
 995                  * "ovs-ofctl dump-flows" back into commands that parse
 996                  * flows. */
 997             } else {
 998                 ofp_fatal(str_, verbose, "unknown keyword %s", name);
 999             }
1000         }
1001     }
1002     if (!fm->cookie_mask && fm->new_cookie == htonll(UINT64_MAX)
1003             && (command == OFPFC_MODIFY || command == OFPFC_MODIFY_STRICT)) {
1004         /* On modifies without a mask, we are supposed to add a flow if
1005          * one does not exist.  If a cookie wasn't been specified, use a
1006          * default of zero. */
1007         fm->new_cookie = htonll(0);
1008     }
1009     if (fields & F_ACTIONS) {
1010         struct ofpbuf ofpacts;
1011         enum ofperr err;
1012
1013         ofpbuf_init(&ofpacts, 32);
1014         str_to_inst_ofpacts(act_str, &ofpacts);
1015         fm->ofpacts_len = ofpacts.size;
1016         fm->ofpacts = ofpbuf_steal_data(&ofpacts);
1017
1018         err = ofpacts_check(fm->ofpacts, fm->ofpacts_len, &fm->match.flow,
1019                             OFPP_MAX);
1020         if (err) {
1021             exit(EXIT_FAILURE);
1022         }
1023
1024     } else {
1025         fm->ofpacts_len = 0;
1026         fm->ofpacts = NULL;
1027     }
1028
1029     free(string);
1030 }
1031
1032 /* Convert 'str_' (as described in the Flow Syntax section of the ovs-ofctl man
1033  * page) into 'mm' for sending the specified meter_mod 'command' to a switch.
1034  */
1035 void
1036 parse_ofp_meter_mod_str(struct ofputil_meter_mod *mm, const char *str_,
1037                         int command, bool verbose)
1038 {
1039     enum {
1040         F_METER = 1 << 0,
1041         F_FLAGS = 1 << 1,
1042         F_BANDS = 1 << 2,
1043     } fields;
1044     char *string = xstrdup(str_);
1045     char *save_ptr = NULL;
1046     char *band_str = NULL;
1047     char *name;
1048
1049     switch (command) {
1050     case -1:
1051         fields = F_METER;
1052         break;
1053
1054     case OFPMC13_ADD:
1055         fields = F_METER | F_FLAGS | F_BANDS;
1056         break;
1057
1058     case OFPMC13_DELETE:
1059         fields = F_METER;
1060         break;
1061
1062     case OFPMC13_MODIFY:
1063         fields = F_METER | F_FLAGS | F_BANDS;
1064         break;
1065
1066     default:
1067         NOT_REACHED();
1068     }
1069
1070     mm->command = command;
1071     mm->meter.meter_id = 0;
1072     mm->meter.flags = 0;
1073     if (fields & F_BANDS) {
1074         band_str = strstr(string, "band");
1075         if (!band_str) {
1076             ofp_fatal(str_, verbose, "must specify bands");
1077         }
1078         *band_str = '\0';
1079
1080         band_str = strchr(band_str + 1, '=');
1081         if (!band_str) {
1082             ofp_fatal(str_, verbose, "must specify bands");
1083         }
1084
1085         band_str++;
1086     }
1087     for (name = strtok_r(string, "=, \t\r\n", &save_ptr); name;
1088          name = strtok_r(NULL, "=, \t\r\n", &save_ptr)) {
1089
1090         if (fields & F_FLAGS && !strcmp(name, "kbps")) {
1091             mm->meter.flags |= OFPMF13_KBPS;
1092         } else if (fields & F_FLAGS && !strcmp(name, "pktps")) {
1093             mm->meter.flags |= OFPMF13_PKTPS;
1094         } else if (fields & F_FLAGS && !strcmp(name, "burst")) {
1095             mm->meter.flags |= OFPMF13_BURST;
1096         } else if (fields & F_FLAGS && !strcmp(name, "stats")) {
1097             mm->meter.flags |= OFPMF13_STATS;
1098         } else {
1099             char *value;
1100
1101             value = strtok_r(NULL, ", \t\r\n", &save_ptr);
1102             if (!value) {
1103                 ofp_fatal(str_, verbose, "field %s missing value", name);
1104             }
1105
1106             if (!strcmp(name, "meter")) {
1107                 if (!strcmp(value, "all")) {
1108                     mm->meter.meter_id = OFPM13_ALL;
1109                 } else if (!strcmp(value, "controller")) {
1110                     mm->meter.meter_id = OFPM13_CONTROLLER;
1111                 } else if (!strcmp(value, "slowpath")) {
1112                     mm->meter.meter_id = OFPM13_SLOWPATH;
1113                 } else {
1114                     mm->meter.meter_id = str_to_u32(value);
1115                     if (mm->meter.meter_id > OFPM13_MAX) {
1116                         ofp_fatal(str_, verbose, "invalid value for %s", name);
1117                     }
1118                 }
1119             } else {
1120                 ofp_fatal(str_, verbose, "unknown keyword %s", name);
1121             }
1122         }
1123     }
1124     if (fields & F_METER && !mm->meter.meter_id) {
1125         ofp_fatal(str_, verbose, "must specify 'meter'");
1126     }
1127     if (fields & F_FLAGS && !mm->meter.flags) {
1128         ofp_fatal(str_, verbose,
1129                   "meter must specify either 'kbps' or 'pktps'");
1130     }
1131
1132     if (fields & F_BANDS) {
1133         struct ofpbuf bands;
1134         uint16_t n_bands = 0;
1135         struct ofputil_meter_band *band = NULL;
1136         int i;
1137
1138         ofpbuf_init(&bands, 64);
1139
1140         for (name = strtok_r(band_str, "=, \t\r\n", &save_ptr); name;
1141              name = strtok_r(NULL, "=, \t\r\n", &save_ptr)) {
1142
1143             char *value;
1144
1145             value = strtok_r(NULL, ", \t\r\n", &save_ptr);
1146             if (!value) {
1147                 ofp_fatal(str_, verbose, "field %s missing value", name);
1148             }
1149
1150             if (!strcmp(name, "type")) {
1151                 /* Start a new band */
1152                 band = ofpbuf_put_zeros(&bands, sizeof *band);
1153                 n_bands++;
1154
1155                 if (!strcmp(value, "drop")) {
1156                     band->type = OFPMBT13_DROP;
1157                 } else if (!strcmp(value, "dscp_remark")) {
1158                     band->type = OFPMBT13_DSCP_REMARK;
1159                 } else {
1160                     ofp_fatal(str_, verbose, "field %s unknown value %s", name,
1161                               value);
1162                 }
1163             } else if (!band || !band->type) {
1164                 ofp_fatal(str_, verbose,
1165                           "band must start with the 'type' keyword");
1166             } else if (!strcmp(name, "rate")) {
1167                 band->rate = str_to_u32(value);
1168             } else if (!strcmp(name, "burst_size")) {
1169                 band->burst_size = str_to_u32(value);
1170             } else if (!strcmp(name, "prec_level")) {
1171                 band->prec_level = str_to_u8(value, name);
1172             } else {
1173                 ofp_fatal(str_, verbose, "unknown keyword %s", name);
1174             }
1175         }
1176         /* validate bands */
1177         if (!n_bands) {
1178             ofp_fatal(str_, verbose, "meter must have bands");
1179         }
1180
1181         mm->meter.n_bands = n_bands;
1182         mm->meter.bands = ofpbuf_steal_data(&bands);
1183
1184         for (i = 0; i < n_bands; ++i) {
1185             band = &mm->meter.bands[i];
1186
1187             if (!band->type) {
1188                 ofp_fatal(str_, verbose, "band must have 'type'");
1189             }
1190             if (band->type == OFPMBT13_DSCP_REMARK) {
1191                 if (!band->prec_level) {
1192                     ofp_fatal(str_, verbose, "'dscp_remark' band must have"
1193                               " 'prec_level'");
1194                 }
1195             } else {
1196                 if (band->prec_level) {
1197                     ofp_fatal(str_, verbose, "Only 'dscp_remark' band may have"
1198                               " 'prec_level'");
1199                 }
1200             }
1201             if (!band->rate) {
1202                 ofp_fatal(str_, verbose, "band must have 'rate'");
1203             }
1204             if (mm->meter.flags & OFPMF13_BURST) {
1205                 if (!band->burst_size) {
1206                     ofp_fatal(str_, verbose, "band must have 'burst_size' "
1207                               "when 'burst' flag is set");
1208                 }
1209             } else {
1210                 if (band->burst_size) {
1211                     ofp_fatal(str_, verbose, "band may have 'burst_size' only "
1212                               "when 'burst' flag is set");
1213                 }
1214             }
1215         }
1216     } else {
1217         mm->meter.n_bands = 0;
1218         mm->meter.bands = NULL;
1219     }
1220
1221     free(string);
1222 }
1223
1224 /* Convert 'str_' (as described in the documentation for the "monitor" command
1225  * in the ovs-ofctl man page) into 'fmr'. */
1226 void
1227 parse_flow_monitor_request(struct ofputil_flow_monitor_request *fmr,
1228                            const char *str_)
1229 {
1230     static uint32_t id;
1231
1232     char *string = xstrdup(str_);
1233     char *save_ptr = NULL;
1234     char *name;
1235
1236     fmr->id = id++;
1237     fmr->flags = (NXFMF_INITIAL | NXFMF_ADD | NXFMF_DELETE | NXFMF_MODIFY
1238                   | NXFMF_OWN | NXFMF_ACTIONS);
1239     fmr->out_port = OFPP_NONE;
1240     fmr->table_id = 0xff;
1241     match_init_catchall(&fmr->match);
1242
1243     for (name = strtok_r(string, "=, \t\r\n", &save_ptr); name;
1244          name = strtok_r(NULL, "=, \t\r\n", &save_ptr)) {
1245         const struct protocol *p;
1246
1247         if (!strcmp(name, "!initial")) {
1248             fmr->flags &= ~NXFMF_INITIAL;
1249         } else if (!strcmp(name, "!add")) {
1250             fmr->flags &= ~NXFMF_ADD;
1251         } else if (!strcmp(name, "!delete")) {
1252             fmr->flags &= ~NXFMF_DELETE;
1253         } else if (!strcmp(name, "!modify")) {
1254             fmr->flags &= ~NXFMF_MODIFY;
1255         } else if (!strcmp(name, "!actions")) {
1256             fmr->flags &= ~NXFMF_ACTIONS;
1257         } else if (!strcmp(name, "!own")) {
1258             fmr->flags &= ~NXFMF_OWN;
1259         } else if (parse_protocol(name, &p)) {
1260             match_set_dl_type(&fmr->match, htons(p->dl_type));
1261             if (p->nw_proto) {
1262                 match_set_nw_proto(&fmr->match, p->nw_proto);
1263             }
1264         } else {
1265             char *value;
1266
1267             value = strtok_r(NULL, ", \t\r\n", &save_ptr);
1268             if (!value) {
1269                 ovs_fatal(0, "%s: field %s missing value", str_, name);
1270             }
1271
1272             if (!strcmp(name, "table")) {
1273                 fmr->table_id = str_to_u8(value, name);
1274             } else if (!strcmp(name, "out_port")) {
1275                 fmr->out_port = u16_to_ofp(atoi(value));
1276             } else if (mf_from_name(name)) {
1277                 parse_field(mf_from_name(name), value, &fmr->match);
1278             } else {
1279                 ovs_fatal(0, "%s: unknown keyword %s", str_, name);
1280             }
1281         }
1282     }
1283     free(string);
1284 }
1285
1286 /* Parses 's' as a set of OpenFlow actions and appends the actions to
1287  * 'actions'.
1288  *
1289  * Prints an error on stderr and aborts the program if 's' syntax is
1290  * invalid. */
1291 void
1292 parse_ofpacts(const char *s_, struct ofpbuf *ofpacts)
1293 {
1294     char *s = xstrdup(s_);
1295     str_to_ofpacts(s, ofpacts);
1296     free(s);
1297 }
1298
1299 /* Parses 'string' as an OFPT_FLOW_MOD or NXT_FLOW_MOD with command 'command'
1300  * (one of OFPFC_*) into 'fm'. */
1301 void
1302 parse_ofp_flow_mod_str(struct ofputil_flow_mod *fm, const char *string,
1303                        uint16_t command, bool verbose)
1304 {
1305     struct match match_copy;
1306
1307     parse_ofp_str(fm, command, string, verbose);
1308
1309     /* Normalize a copy of the match.  This ensures that non-normalized flows
1310      * get logged but doesn't affect what gets sent to the switch, so that the
1311      * switch can do whatever it likes with the flow. */
1312     match_copy = fm->match;
1313     ofputil_normalize_match(&match_copy);
1314 }
1315
1316 void
1317 parse_ofp_flow_mod_file(const char *file_name, uint16_t command,
1318                         struct ofputil_flow_mod **fms, size_t *n_fms)
1319 {
1320     size_t allocated_fms;
1321     FILE *stream;
1322     struct ds s;
1323
1324     stream = !strcmp(file_name, "-") ? stdin : fopen(file_name, "r");
1325     if (stream == NULL) {
1326         ovs_fatal(errno, "%s: open", file_name);
1327     }
1328
1329     allocated_fms = *n_fms;
1330     ds_init(&s);
1331     while (!ds_get_preprocessed_line(&s, stream)) {
1332         if (*n_fms >= allocated_fms) {
1333             *fms = x2nrealloc(*fms, &allocated_fms, sizeof **fms);
1334         }
1335         parse_ofp_flow_mod_str(&(*fms)[*n_fms], ds_cstr(&s), command, false);
1336         *n_fms += 1;
1337     }
1338     ds_destroy(&s);
1339
1340     if (stream != stdin) {
1341         fclose(stream);
1342     }
1343 }
1344
1345 void
1346 parse_ofp_flow_stats_request_str(struct ofputil_flow_stats_request *fsr,
1347                                  bool aggregate, const char *string)
1348 {
1349     struct ofputil_flow_mod fm;
1350
1351     parse_ofp_str(&fm, -1, string, false);
1352     fsr->aggregate = aggregate;
1353     fsr->cookie = fm.cookie;
1354     fsr->cookie_mask = fm.cookie_mask;
1355     fsr->match = fm.match;
1356     fsr->out_port = fm.out_port;
1357     fsr->table_id = fm.table_id;
1358 }
1359
1360 /* Parses a specification of a flow from 's' into 'flow'.  's' must take the
1361  * form FIELD=VALUE[,FIELD=VALUE]... where each FIELD is the name of a
1362  * mf_field.  Fields must be specified in a natural order for satisfying
1363  * prerequisites.
1364  *
1365  * Returns NULL on success, otherwise a malloc()'d string that explains the
1366  * problem. */
1367 char *
1368 parse_ofp_exact_flow(struct flow *flow, const char *s)
1369 {
1370     char *pos, *key, *value_s;
1371     char *error = NULL;
1372     char *copy;
1373
1374     memset(flow, 0, sizeof *flow);
1375
1376     pos = copy = xstrdup(s);
1377     while (ofputil_parse_key_value(&pos, &key, &value_s)) {
1378         const struct protocol *p;
1379         if (parse_protocol(key, &p)) {
1380             if (flow->dl_type) {
1381                 error = xasprintf("%s: Ethernet type set multiple times", s);
1382                 goto exit;
1383             }
1384             flow->dl_type = htons(p->dl_type);
1385
1386             if (p->nw_proto) {
1387                 if (flow->nw_proto) {
1388                     error = xasprintf("%s: network protocol set "
1389                                       "multiple times", s);
1390                     goto exit;
1391                 }
1392                 flow->nw_proto = p->nw_proto;
1393             }
1394         } else {
1395             const struct mf_field *mf;
1396             union mf_value value;
1397             char *field_error;
1398
1399             mf = mf_from_name(key);
1400             if (!mf) {
1401                 error = xasprintf("%s: unknown field %s", s, key);
1402                 goto exit;
1403             }
1404
1405             if (!mf_are_prereqs_ok(mf, flow)) {
1406                 error = xasprintf("%s: prerequisites not met for setting %s",
1407                                   s, key);
1408                 goto exit;
1409             }
1410
1411             if (!mf_is_zero(mf, flow)) {
1412                 error = xasprintf("%s: field %s set multiple times", s, key);
1413                 goto exit;
1414             }
1415
1416             field_error = mf_parse_value(mf, value_s, &value);
1417             if (field_error) {
1418                 error = xasprintf("%s: bad value for %s (%s)",
1419                                   s, key, field_error);
1420                 free(field_error);
1421                 goto exit;
1422             }
1423
1424             mf_set_flow_value(mf, &value, flow);
1425         }
1426     }
1427
1428     if (!flow->in_port.ofp_port) {
1429         flow->in_port.ofp_port = OFPP_NONE;
1430     }
1431
1432 exit:
1433     free(copy);
1434
1435     if (error) {
1436         memset(flow, 0, sizeof *flow);
1437     }
1438     return error;
1439 }