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 "autopath.h"
  26 #include "bundle.h"
  27 #include "byte-order.h"
  28 #include "dynamic-string.h"
  29 #include "learn.h"
  30 #include "meta-flow.h"
  31 #include "netdev.h"
  32 #include "multipath.h"
  33 #include "nx-match.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 uint8_t
  45 str_to_table_id(const char *str)
  46 {
  47     int table_id;
  48
  49     if (!str_to_int(str, 10, &table_id) || table_id < 0 || table_id > 255) {
  50         ovs_fatal(0, "invalid table \"%s\"", str);
  51     }
  52     return table_id;
  53 }
  54
  55 static uint16_t
  56 str_to_u16(const char *str, const char *name)
  57 {
  58     int value;
  59
  60     if (!str_to_int(str, 0, &value) || value < 0 || value > 65535) {
  61         ovs_fatal(0, "invalid %s \"%s\"", name, str);
  62     }
  63     return value;
  64 }
  65
  66 static uint32_t
  67 str_to_u32(const char *str)
  68 {
  69     char *tail;
  70     uint32_t value;
  71
  72     if (!str[0]) {
  73         ovs_fatal(0, "missing required numeric argument");
  74     }
  75
  76     errno = 0;
  77     value = strtoul(str, &tail, 0);
  78     if (errno == EINVAL || errno == ERANGE || *tail) {
  79         ovs_fatal(0, "invalid numeric format %s", str);
  80     }
  81     return value;
  82 }
  83
  84 static uint64_t
  85 str_to_u64(const char *str)
  86 {
  87     char *tail;
  88     uint64_t value;
  89
  90     if (!str[0]) {
  91         ovs_fatal(0, "missing required numeric argument");
  92     }
  93
  94     errno = 0;
  95     value = strtoull(str, &tail, 0);
  96     if (errno == EINVAL || errno == ERANGE || *tail) {
  97         ovs_fatal(0, "invalid numeric format %s", str);
  98     }
  99     return value;
 100 }
 101
 102 static void
 103 str_to_mac(const char *str, uint8_t mac[6])
 104 {
 105     if (sscanf(str, ETH_ADDR_SCAN_FMT, ETH_ADDR_SCAN_ARGS(mac))
 106         != ETH_ADDR_SCAN_COUNT) {
 107         ovs_fatal(0, "invalid mac address %s", str);
 108     }
 109 }
 110
 111 static void
 112 str_to_ip(const char *str, ovs_be32 *ip)
 113 {
 114     struct in_addr in_addr;
 115
 116     if (lookup_ip(str, &in_addr)) {
 117         ovs_fatal(0, "%s: could not convert to IP address", str);
 118     }
 119     *ip = in_addr.s_addr;
 120 }
 121
 122 static struct ofp_action_output *
 123 put_output_action(struct ofpbuf *b, uint16_t port)
 124 {
 125     struct ofp_action_output *oao;
 126
 127     oao = ofputil_put_OFPAT10_OUTPUT(b);
 128     oao->port = htons(port);
 129     return oao;
 130 }
 131
 132 static void
 133 parse_enqueue(struct ofpbuf *b, char *arg)
 134 {
 135     char *sp = NULL;
 136     char *port = strtok_r(arg, ":q", &sp);
 137     char *queue = strtok_r(NULL, "", &sp);
 138     struct ofp_action_enqueue *oae;
 139
 140     if (port == NULL || queue == NULL) {
 141         ovs_fatal(0, "\"enqueue\" syntax is \"enqueue:PORT:QUEUE\"");
 142     }
 143
 144     oae = ofputil_put_OFPAT10_ENQUEUE(b);
 145     oae->port = htons(str_to_u32(port));
 146     oae->queue_id = htonl(str_to_u32(queue));
 147 }
 148
 149 static void
 150 parse_output(struct ofpbuf *b, char *arg)
 151 {
 152     if (strchr(arg, '[')) {
 153         struct nx_action_output_reg *naor;
 154         struct mf_subfield src;
 155
 156         mf_parse_subfield(&src, arg);
 157
 158         naor = ofputil_put_NXAST_OUTPUT_REG(b);
 159         naor->ofs_nbits = nxm_encode_ofs_nbits(src.ofs, src.n_bits);
 160         naor->src = htonl(src.field->nxm_header);
 161         naor->max_len = htons(UINT16_MAX);
 162     } else {
 163         put_output_action(b, str_to_u32(arg));
 164     }
 165 }
 166
 167 static void
 168 parse_resubmit(struct ofpbuf *b, char *arg)
 169 {
 170     struct nx_action_resubmit *nar;
 171     char *in_port_s, *table_s;
 172     uint16_t in_port;
 173     uint8_t table;
 174
 175     in_port_s = strsep(&arg, ",");
 176     if (in_port_s && in_port_s[0]) {
 177         if (!ofputil_port_from_string(in_port_s, &in_port)) {
 178             in_port = str_to_u32(in_port_s);
 179         }
 180     } else {
 181         in_port = OFPP_IN_PORT;
 182     }
 183
 184     table_s = strsep(&arg, ",");
 185     table = table_s && table_s[0] ? str_to_u32(table_s) : 255;
 186
 187     if (in_port == OFPP_IN_PORT && table == 255) {
 188         ovs_fatal(0, "at least one \"in_port\" or \"table\" must be specified "
 189                   " on resubmit");
 190     }
 191
 192     if (in_port != OFPP_IN_PORT && table == 255) {
 193         nar = ofputil_put_NXAST_RESUBMIT(b);
 194     } else {
 195         nar = ofputil_put_NXAST_RESUBMIT_TABLE(b);
 196         nar->table = table;
 197     }
 198     nar->in_port = htons(in_port);
 199 }
 200
 201 static void
 202 parse_set_tunnel(struct ofpbuf *b, const char *arg)
 203 {
 204     uint64_t tun_id = str_to_u64(arg);
 205     if (tun_id > UINT32_MAX) {
 206         ofputil_put_NXAST_SET_TUNNEL64(b)->tun_id = htonll(tun_id);
 207     } else {
 208         ofputil_put_NXAST_SET_TUNNEL(b)->tun_id = htonl(tun_id);
 209     }
 210 }
 211
 212 static void
 213 parse_note(struct ofpbuf *b, const char *arg)
 214 {
 215     size_t start_ofs = b->size;
 216     struct nx_action_note *nan;
 217     int remainder;
 218     size_t len;
 219
 220     nan = ofputil_put_NXAST_NOTE(b);
 221
 222     b->size -= sizeof nan->note;
 223     while (*arg != '\0') {
 224         uint8_t byte;
 225         bool ok;
 226
 227         if (*arg == '.') {
 228             arg++;
 229         }
 230         if (*arg == '\0') {
 231             break;
 232         }
 233
 234         byte = hexits_value(arg, 2, &ok);
 235         if (!ok) {
 236             ovs_fatal(0, "bad hex digit in `note' argument");
 237         }
 238         ofpbuf_put(b, &byte, 1);
 239
 240         arg += 2;
 241     }
 242
 243     len = b->size - start_ofs;
 244     remainder = len % OFP_ACTION_ALIGN;
 245     if (remainder) {
 246         ofpbuf_put_zeros(b, OFP_ACTION_ALIGN - remainder);
 247     }
 248     nan = (struct nx_action_note *)((char *)b->data + start_ofs);
 249     nan->len = htons(b->size - start_ofs);
 250 }
 251
 252 static void
 253 parse_fin_timeout(struct ofpbuf *b, char *arg)
 254 {
 255     struct nx_action_fin_timeout *naft;
 256     char *key, *value;
 257
 258     naft = ofputil_put_NXAST_FIN_TIMEOUT(b);
 259     while (ofputil_parse_key_value(&arg, &key, &value)) {
 260         if (!strcmp(key, "idle_timeout")) {
 261             naft->fin_idle_timeout = htons(str_to_u16(value, key));
 262         } else if (!strcmp(key, "hard_timeout")) {
 263             naft->fin_hard_timeout = htons(str_to_u16(value, key));
 264         } else {
 265             ovs_fatal(0, "invalid key '%s' in 'fin_timeout' argument", key);
 266         }
 267     }
 268 }
 269
 270 static void
 271 parse_controller(struct ofpbuf *b, char *arg)
 272 {
 273     enum ofp_packet_in_reason reason = OFPR_ACTION;
 274     uint16_t controller_id = 0;
 275     uint16_t max_len = UINT16_MAX;
 276
 277     if (!arg[0]) {
 278         /* Use defaults. */
 279     } else if (strspn(arg, "0123456789") == strlen(arg)) {
 280         max_len = str_to_u16(arg, "max_len");
 281     } else {
 282         char *name, *value;
 283
 284         while (ofputil_parse_key_value(&arg, &name, &value)) {
 285             if (!strcmp(name, "reason")) {
 286                 if (!ofputil_packet_in_reason_from_string(value, &reason)) {
 287                     ovs_fatal(0, "unknown reason \"%s\"", value);
 288                 }
 289             } else if (!strcmp(name, "max_len")) {
 290                 max_len = str_to_u16(value, "max_len");
 291             } else if (!strcmp(name, "id")) {
 292                 controller_id = str_to_u16(value, "id");
 293             } else {
 294                 ovs_fatal(0, "unknown key \"%s\" parsing controller action",
 295                           name);
 296             }
 297         }
 298     }
 299
 300     if (reason == OFPR_ACTION && controller_id == 0) {
 301         put_output_action(b, OFPP_CONTROLLER)->max_len = htons(max_len);
 302     } else {
 303         struct nx_action_controller *nac;
 304
 305         nac = ofputil_put_NXAST_CONTROLLER(b);
 306         nac->max_len = htons(max_len);
 307         nac->reason = reason;
 308         nac->controller_id = htons(controller_id);
 309     }
 310 }
 311
 312 static void
 313 parse_named_action(enum ofputil_action_code code, const struct flow *flow,
 314                    struct ofpbuf *b, char *arg)
 315 {
 316     struct ofp_action_dl_addr *oada;
 317     struct ofp_action_vlan_pcp *oavp;
 318     struct ofp_action_vlan_vid *oavv;
 319     struct ofp_action_nw_addr *oana;
 320     struct ofp_action_tp_port *oata;
 321
 322     switch (code) {
 323     case OFPUTIL_OFPAT10_OUTPUT:
 324         parse_output(b, arg);
 325         break;
 326
 327     case OFPUTIL_OFPAT10_SET_VLAN_VID:
 328         oavv = ofputil_put_OFPAT10_SET_VLAN_VID(b);
 329         oavv->vlan_vid = htons(str_to_u32(arg));
 330         break;
 331
 332     case OFPUTIL_OFPAT10_SET_VLAN_PCP:
 333         oavp = ofputil_put_OFPAT10_SET_VLAN_PCP(b);
 334         oavp->vlan_pcp = str_to_u32(arg);
 335         break;
 336
 337     case OFPUTIL_OFPAT10_STRIP_VLAN:
 338         ofputil_put_OFPAT10_STRIP_VLAN(b);
 339         break;
 340
 341     case OFPUTIL_OFPAT10_SET_DL_SRC:
 342     case OFPUTIL_OFPAT10_SET_DL_DST:
 343         oada = ofputil_put_action(code, b);
 344         str_to_mac(arg, oada->dl_addr);
 345         break;
 346
 347     case OFPUTIL_OFPAT10_SET_NW_SRC:
 348     case OFPUTIL_OFPAT10_SET_NW_DST:
 349         oana = ofputil_put_action(code, b);
 350         str_to_ip(arg, &oana->nw_addr);
 351         break;
 352
 353     case OFPUTIL_OFPAT10_SET_NW_TOS:
 354         ofputil_put_OFPAT10_SET_NW_TOS(b)->nw_tos = str_to_u32(arg);
 355         break;
 356
 357     case OFPUTIL_OFPAT10_SET_TP_SRC:
 358     case OFPUTIL_OFPAT10_SET_TP_DST:
 359         oata = ofputil_put_action(code, b);
 360         oata->tp_port = htons(str_to_u32(arg));
 361         break;
 362
 363     case OFPUTIL_OFPAT10_ENQUEUE:
 364         parse_enqueue(b, arg);
 365         break;
 366
 367     case OFPUTIL_NXAST_RESUBMIT:
 368         parse_resubmit(b, arg);
 369         break;
 370
 371     case OFPUTIL_NXAST_SET_TUNNEL:
 372         parse_set_tunnel(b, arg);
 373         break;
 374
 375     case OFPUTIL_NXAST_SET_QUEUE:
 376         ofputil_put_NXAST_SET_QUEUE(b)->queue_id = htonl(str_to_u32(arg));
 377         break;
 378
 379     case OFPUTIL_NXAST_POP_QUEUE:
 380         ofputil_put_NXAST_POP_QUEUE(b);
 381         break;
 382
 383     case OFPUTIL_NXAST_REG_MOVE:
 384         nxm_parse_reg_move(ofputil_put_NXAST_REG_MOVE(b), arg);
 385         break;
 386
 387     case OFPUTIL_NXAST_REG_LOAD:
 388         nxm_parse_reg_load(ofputil_put_NXAST_REG_LOAD(b), arg);
 389         break;
 390
 391     case OFPUTIL_NXAST_NOTE:
 392         parse_note(b, arg);
 393         break;
 394
 395     case OFPUTIL_NXAST_SET_TUNNEL64:
 396         ofputil_put_NXAST_SET_TUNNEL64(b)->tun_id = htonll(str_to_u64(arg));
 397         break;
 398
 399     case OFPUTIL_NXAST_MULTIPATH:
 400         multipath_parse(ofputil_put_NXAST_MULTIPATH(b), arg);
 401         break;
 402
 403     case OFPUTIL_NXAST_AUTOPATH:
 404         autopath_parse(ofputil_put_NXAST_AUTOPATH(b), arg);
 405         break;
 406
 407     case OFPUTIL_NXAST_BUNDLE:
 408         bundle_parse(b, arg);
 409         break;
 410
 411     case OFPUTIL_NXAST_BUNDLE_LOAD:
 412         bundle_parse_load(b, arg);
 413         break;
 414
 415     case OFPUTIL_NXAST_RESUBMIT_TABLE:
 416     case OFPUTIL_NXAST_OUTPUT_REG:
 417         NOT_REACHED();
 418
 419     case OFPUTIL_NXAST_LEARN:
 420         learn_parse(b, arg, flow);
 421         break;
 422
 423     case OFPUTIL_NXAST_EXIT:
 424         ofputil_put_NXAST_EXIT(b);
 425         break;
 426
 427     case OFPUTIL_NXAST_DEC_TTL:
 428         ofputil_put_NXAST_DEC_TTL(b);
 429         break;
 430
 431     case OFPUTIL_NXAST_FIN_TIMEOUT:
 432         parse_fin_timeout(b, arg);
 433         break;
 434
 435     case OFPUTIL_NXAST_CONTROLLER:
 436         parse_controller(b, arg);
 437         break;
 438     }
 439 }
 440
 441 static void
 442 str_to_action(const struct flow *flow, char *str, struct ofpbuf *b)
 443 {
 444     char *pos, *act, *arg;
 445     int n_actions;
 446
 447     pos = str;
 448     n_actions = 0;
 449     while (ofputil_parse_key_value(&pos, &act, &arg)) {
 450         uint16_t port;
 451         int code;
 452
 453         code = ofputil_action_code_from_name(act);
 454         if (code >= 0) {
 455             parse_named_action(code, flow, b, arg);
 456         } else if (!strcasecmp(act, "drop")) {
 457             /* A drop action in OpenFlow occurs by just not setting
 458              * an action. */
 459             if (n_actions) {
 460                 ovs_fatal(0, "Drop actions must not be preceded by other "
 461                           "actions");
 462             } else if (ofputil_parse_key_value(&pos, &act, &arg)) {
 463                 ovs_fatal(0, "Drop actions must not be followed by other "
 464                           "actions");
 465             }
 466             break;
 467         } else if (ofputil_port_from_string(act, &port)) {
 468             put_output_action(b, port);
 469         } else {
 470             ovs_fatal(0, "Unknown action: %s", act);
 471         }
 472         n_actions++;
 473     }
 474 }
 475
 476 struct protocol {
 477     const char *name;
 478     uint16_t dl_type;
 479     uint8_t nw_proto;
 480 };
 481
 482 static bool
 483 parse_protocol(const char *name, const struct protocol **p_out)
 484 {
 485     static const struct protocol protocols[] = {
 486         { "ip", ETH_TYPE_IP, 0 },
 487         { "arp", ETH_TYPE_ARP, 0 },
 488         { "icmp", ETH_TYPE_IP, IPPROTO_ICMP },
 489         { "tcp", ETH_TYPE_IP, IPPROTO_TCP },
 490         { "udp", ETH_TYPE_IP, IPPROTO_UDP },
 491         { "ipv6", ETH_TYPE_IPV6, 0 },
 492         { "ip6", ETH_TYPE_IPV6, 0 },
 493         { "icmp6", ETH_TYPE_IPV6, IPPROTO_ICMPV6 },
 494         { "tcp6", ETH_TYPE_IPV6, IPPROTO_TCP },
 495         { "udp6", ETH_TYPE_IPV6, IPPROTO_UDP },
 496     };
 497     const struct protocol *p;
 498
 499     for (p = protocols; p < &protocols[ARRAY_SIZE(protocols)]; p++) {
 500         if (!strcmp(p->name, name)) {
 501             *p_out = p;
 502             return true;
 503         }
 504     }
 505     *p_out = NULL;
 506     return false;
 507 }
 508
 509 static void
 510 ofp_fatal(const char *flow, bool verbose, const char *format, ...)
 511 {
 512     va_list args;
 513
 514     if (verbose) {
 515         fprintf(stderr, "%s:\n", flow);
 516     }
 517
 518     va_start(args, format);
 519     ovs_fatal_valist(0, format, args);
 520 }
 521
 522 static void
 523 parse_field(const struct mf_field *mf, const char *s, struct cls_rule *rule)
 524 {
 525     union mf_value value, mask;
 526     char *error;
 527
 528     error = mf_parse(mf, s, &value, &mask);
 529     if (error) {
 530         ovs_fatal(0, "%s", error);
 531     }
 532
 533     mf_set(mf, &value, &mask, rule);
 534 }
 535
 536 /* Convert 'str_' (as described in the Flow Syntax section of the ovs-ofctl man
 537  * page) into 'fm' for sending the specified flow_mod 'command' to a switch.
 538  * If 'actions' is specified, an action must be in 'string' and may be expanded
 539  * or reallocated.
 540  *
 541  * To parse syntax for an OFPT_FLOW_MOD (or NXT_FLOW_MOD), use an OFPFC_*
 542  * constant for 'command'.  To parse syntax for an OFPST_FLOW or
 543  * OFPST_AGGREGATE (or NXST_FLOW or NXST_AGGREGATE), use -1 for 'command'. */
 544 void
 545 parse_ofp_str(struct ofputil_flow_mod *fm, int command, const char *str_,
 546               bool verbose)
 547 {
 548     enum {
 549         F_OUT_PORT = 1 << 0,
 550         F_ACTIONS = 1 << 1,
 551         F_TIMEOUT = 1 << 3,
 552         F_PRIORITY = 1 << 4,
 553         F_FLAGS = 1 << 5,
 554     } fields;
 555     char *string = xstrdup(str_);
 556     char *save_ptr = NULL;
 557     char *act_str = NULL;
 558     char *name;
 559
 560     switch (command) {
 561     case -1:
 562         fields = F_OUT_PORT;
 563         break;
 564
 565     case OFPFC_ADD:
 566         fields = F_ACTIONS | F_TIMEOUT | F_PRIORITY | F_FLAGS;
 567         break;
 568
 569     case OFPFC_DELETE:
 570         fields = F_OUT_PORT;
 571         break;
 572
 573     case OFPFC_DELETE_STRICT:
 574         fields = F_OUT_PORT | F_PRIORITY;
 575         break;
 576
 577     case OFPFC_MODIFY:
 578         fields = F_ACTIONS | F_TIMEOUT | F_PRIORITY | F_FLAGS;
 579         break;
 580
 581     case OFPFC_MODIFY_STRICT:
 582         fields = F_ACTIONS | F_TIMEOUT | F_PRIORITY | F_FLAGS;
 583         break;
 584
 585     default:
 586         NOT_REACHED();
 587     }
 588
 589     cls_rule_init_catchall(&fm->cr, OFP_DEFAULT_PRIORITY);
 590     fm->cookie = htonll(0);
 591     fm->cookie_mask = htonll(0);
 592     fm->table_id = 0xff;
 593     fm->command = command;
 594     fm->idle_timeout = OFP_FLOW_PERMANENT;
 595     fm->hard_timeout = OFP_FLOW_PERMANENT;
 596     fm->buffer_id = UINT32_MAX;
 597     fm->out_port = OFPP_NONE;
 598     fm->flags = 0;
 599     if (fields & F_ACTIONS) {
 600         act_str = strstr(string, "action");
 601         if (!act_str) {
 602             ofp_fatal(str_, verbose, "must specify an action");
 603         }
 604         *act_str = '\0';
 605
 606         act_str = strchr(act_str + 1, '=');
 607         if (!act_str) {
 608             ofp_fatal(str_, verbose, "must specify an action");
 609         }
 610
 611         act_str++;
 612     }
 613     for (name = strtok_r(string, "=, \t\r\n", &save_ptr); name;
 614          name = strtok_r(NULL, "=, \t\r\n", &save_ptr)) {
 615         const struct protocol *p;
 616
 617         if (parse_protocol(name, &p)) {
 618             cls_rule_set_dl_type(&fm->cr, htons(p->dl_type));
 619             if (p->nw_proto) {
 620                 cls_rule_set_nw_proto(&fm->cr, p->nw_proto);
 621             }
 622         } else if (fields & F_FLAGS && !strcmp(name, "send_flow_rem")) {
 623             fm->flags |= OFPFF_SEND_FLOW_REM;
 624         } else if (fields & F_FLAGS && !strcmp(name, "check_overlap")) {
 625             fm->flags |= OFPFF_CHECK_OVERLAP;
 626         } else {
 627             char *value;
 628
 629             value = strtok_r(NULL, ", \t\r\n", &save_ptr);
 630             if (!value) {
 631                 ofp_fatal(str_, verbose, "field %s missing value", name);
 632             }
 633
 634             if (!strcmp(name, "table")) {
 635                 fm->table_id = str_to_table_id(value);
 636             } else if (!strcmp(name, "out_port")) {
 637                 fm->out_port = atoi(value);
 638             } else if (fields & F_PRIORITY && !strcmp(name, "priority")) {
 639                 fm->cr.priority = str_to_u16(value, name);
 640             } else if (fields & F_TIMEOUT && !strcmp(name, "idle_timeout")) {
 641                 fm->idle_timeout = str_to_u16(value, name);
 642             } else if (fields & F_TIMEOUT && !strcmp(name, "hard_timeout")) {
 643                 fm->hard_timeout = str_to_u16(value, name);
 644             } else if (!strcmp(name, "cookie")) {
 645                 char *mask = strchr(value, '/');
 646                 if (mask) {
 647                     if (command == OFPFC_ADD) {
 648                         ofp_fatal(str_, verbose, "flow additions cannot use "
 649                                   "a cookie mask");
 650                     }
 651                     *mask = '\0';
 652                     fm->cookie_mask = htonll(str_to_u64(mask+1));
 653                 } else {
 654                     fm->cookie_mask = htonll(UINT64_MAX);
 655                 }
 656                 fm->cookie = htonll(str_to_u64(value));
 657             } else if (mf_from_name(name)) {
 658                 parse_field(mf_from_name(name), value, &fm->cr);
 659             } else if (!strcmp(name, "duration")
 660                        || !strcmp(name, "n_packets")
 661                        || !strcmp(name, "n_bytes")) {
 662                 /* Ignore these, so that users can feed the output of
 663                  * "ovs-ofctl dump-flows" back into commands that parse
 664                  * flows. */
 665             } else {
 666                 ofp_fatal(str_, verbose, "unknown keyword %s", name);
 667             }
 668         }
 669     }
 670     if (fields & F_ACTIONS) {
 671         struct ofpbuf actions;
 672
 673         ofpbuf_init(&actions, sizeof(union ofp_action));
 674         str_to_action(&fm->cr.flow, act_str, &actions);
 675         fm->actions = ofpbuf_steal_data(&actions);
 676         fm->n_actions = actions.size / sizeof(union ofp_action);
 677     } else {
 678         fm->actions = NULL;
 679         fm->n_actions = 0;
 680     }
 681
 682     free(string);
 683 }
 684
 685 /* Parses 's' as a set of OpenFlow actions and appends the actions to
 686  * 'actions'.
 687  *
 688  * Prints an error on stderr and aborts the program if 's' syntax is
 689  * invalid. */
 690 void
 691 parse_ofp_actions(const char *s_, struct ofpbuf *actions)
 692 {
 693     char *s = xstrdup(s_);
 694     str_to_action(NULL, s, actions);
 695     free(s);
 696 }
 697
 698 /* Parses 'string' as an OFPT_FLOW_MOD or NXT_FLOW_MOD with command 'command'
 699  * (one of OFPFC_*) into 'fm'. */
 700 void
 701 parse_ofp_flow_mod_str(struct ofputil_flow_mod *fm, const char *string,
 702                        uint16_t command, bool verbose)
 703 {
 704     struct cls_rule rule_copy;
 705
 706     parse_ofp_str(fm, command, string, verbose);
 707
 708     /* Normalize a copy of the rule.  This ensures that non-normalized flows
 709      * get logged but doesn't affect what gets sent to the switch, so that the
 710      * switch can do whatever it likes with the flow. */
 711     rule_copy = fm->cr;
 712     ofputil_normalize_rule(&rule_copy);
 713 }
 714
 715 void
 716 parse_ofp_flow_mod_file(const char *file_name, uint16_t command,
 717                         struct ofputil_flow_mod **fms, size_t *n_fms)
 718 {
 719     size_t allocated_fms;
 720     FILE *stream;
 721     struct ds s;
 722
 723     stream = !strcmp(file_name, "-") ? stdin : fopen(file_name, "r");
 724     if (stream == NULL) {
 725         ovs_fatal(errno, "%s: open", file_name);
 726     }
 727
 728     allocated_fms = *n_fms;
 729     ds_init(&s);
 730     while (!ds_get_preprocessed_line(&s, stream)) {
 731         if (*n_fms >= allocated_fms) {
 732             *fms = x2nrealloc(*fms, &allocated_fms, sizeof **fms);
 733         }
 734         parse_ofp_flow_mod_str(&(*fms)[*n_fms], ds_cstr(&s), command, false);
 735         *n_fms += 1;
 736     }
 737     ds_destroy(&s);
 738
 739     if (stream != stdin) {
 740         fclose(stream);
 741     }
 742 }
 743
 744 void
 745 parse_ofp_flow_stats_request_str(struct ofputil_flow_stats_request *fsr,
 746                                  bool aggregate, const char *string)
 747 {
 748     struct ofputil_flow_mod fm;
 749
 750     parse_ofp_str(&fm, -1, string, false);
 751     fsr->aggregate = aggregate;
 752     fsr->cookie = fm.cookie;
 753     fsr->cookie_mask = fm.cookie_mask;
 754     fsr->match = fm.cr;
 755     fsr->out_port = fm.out_port;
 756     fsr->table_id = fm.table_id;
 757 }