lib/ofp-parse.c

   1 /*
   2  * Copyright (c) 2010 Nicira Networks.
   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 "byte-order.h"
  26 #include "dynamic-string.h"
  27 #include "netdev.h"
  28 #include "nx-match.h"
  29 #include "ofp-util.h"
  30 #include "ofpbuf.h"
  31 #include "openflow/openflow.h"
  32 #include "packets.h"
  33 #include "socket-util.h"
  34 #include "vconn.h"
  35 #include "vlog.h"
  36
  37 VLOG_DEFINE_THIS_MODULE(ofp_parse);
  38
  39 static uint32_t
  40 str_to_u32(const char *str)
  41 {
  42     char *tail;
  43     uint32_t value;
  44
  45     if (!str) {
  46         ovs_fatal(0, "missing required numeric argument");
  47     }
  48
  49     errno = 0;
  50     value = strtoul(str, &tail, 0);
  51     if (errno == EINVAL || errno == ERANGE || *tail) {
  52         ovs_fatal(0, "invalid numeric format %s", str);
  53     }
  54     return value;
  55 }
  56
  57 static uint64_t
  58 str_to_u64(const char *str)
  59 {
  60     char *tail;
  61     uint64_t value;
  62
  63     errno = 0;
  64     value = strtoull(str, &tail, 0);
  65     if (errno == EINVAL || errno == ERANGE || *tail) {
  66         ovs_fatal(0, "invalid numeric format %s", str);
  67     }
  68     return value;
  69 }
  70
  71 static void
  72 str_to_mac(const char *str, uint8_t mac[6])
  73 {
  74     if (sscanf(str, ETH_ADDR_SCAN_FMT, ETH_ADDR_SCAN_ARGS(mac))
  75         != ETH_ADDR_SCAN_COUNT) {
  76         ovs_fatal(0, "invalid mac address %s", str);
  77     }
  78 }
  79
  80 static void
  81 str_to_ip(const char *str_, ovs_be32 *ip, ovs_be32 *maskp)
  82 {
  83     char *str = xstrdup(str_);
  84     char *save_ptr = NULL;
  85     const char *name, *netmask;
  86     struct in_addr in_addr;
  87     ovs_be32 mask;
  88     int retval;
  89
  90     name = strtok_r(str, "/", &save_ptr);
  91     retval = name ? lookup_ip(name, &in_addr) : EINVAL;
  92     if (retval) {
  93         ovs_fatal(0, "%s: could not convert to IP address", str);
  94     }
  95     *ip = in_addr.s_addr;
  96
  97     netmask = strtok_r(NULL, "/", &save_ptr);
  98     if (netmask) {
  99         uint8_t o[4];
 100         if (sscanf(netmask, "%"SCNu8".%"SCNu8".%"SCNu8".%"SCNu8,
 101                    &o[0], &o[1], &o[2], &o[3]) == 4) {
 102             mask = htonl((o[0] << 24) | (o[1] << 16) | (o[2] << 8) | o[3]);
 103         } else {
 104             int prefix = atoi(netmask);
 105             if (prefix <= 0 || prefix > 32) {
 106                 ovs_fatal(0, "%s: network prefix bits not between 1 and 32",
 107                           str);
 108             } else if (prefix == 32) {
 109                 mask = htonl(UINT32_MAX);
 110             } else {
 111                 mask = htonl(((1u << prefix) - 1) << (32 - prefix));
 112             }
 113         }
 114     } else {
 115         mask = htonl(UINT32_MAX);
 116     }
 117     *ip &= mask;
 118
 119     if (maskp) {
 120         *maskp = mask;
 121     } else {
 122         if (mask != htonl(UINT32_MAX)) {
 123             ovs_fatal(0, "%s: netmask not allowed here", str_);
 124         }
 125     }
 126
 127     free(str);
 128 }
 129
 130 static void *
 131 put_action(struct ofpbuf *b, size_t size, uint16_t type)
 132 {
 133     struct ofp_action_header *ah = ofpbuf_put_zeros(b, size);
 134     ah->type = htons(type);
 135     ah->len = htons(size);
 136     return ah;
 137 }
 138
 139 static struct ofp_action_output *
 140 put_output_action(struct ofpbuf *b, uint16_t port)
 141 {
 142     struct ofp_action_output *oao = put_action(b, sizeof *oao, OFPAT_OUTPUT);
 143     oao->port = htons(port);
 144     return oao;
 145 }
 146
 147 static void
 148 put_enqueue_action(struct ofpbuf *b, uint16_t port, uint32_t queue)
 149 {
 150     struct ofp_action_enqueue *oae = put_action(b, sizeof *oae, OFPAT_ENQUEUE);
 151     oae->port = htons(port);
 152     oae->queue_id = htonl(queue);
 153 }
 154
 155 static void
 156 put_dl_addr_action(struct ofpbuf *b, uint16_t type, const char *addr)
 157 {
 158     struct ofp_action_dl_addr *oada = put_action(b, sizeof *oada, type);
 159     str_to_mac(addr, oada->dl_addr);
 160 }
 161
 162
 163 static bool
 164 parse_port_name(const char *name, uint16_t *port)
 165 {
 166     struct pair {
 167         const char *name;
 168         uint16_t value;
 169     };
 170     static const struct pair pairs[] = {
 171 #define DEF_PAIR(NAME) {#NAME, OFPP_##NAME}
 172         DEF_PAIR(IN_PORT),
 173         DEF_PAIR(TABLE),
 174         DEF_PAIR(NORMAL),
 175         DEF_PAIR(FLOOD),
 176         DEF_PAIR(ALL),
 177         DEF_PAIR(CONTROLLER),
 178         DEF_PAIR(LOCAL),
 179         DEF_PAIR(NONE),
 180 #undef DEF_PAIR
 181     };
 182     static const int n_pairs = ARRAY_SIZE(pairs);
 183     size_t i;
 184
 185     for (i = 0; i < n_pairs; i++) {
 186         if (!strcasecmp(name, pairs[i].name)) {
 187             *port = pairs[i].value;
 188             return true;
 189         }
 190     }
 191     return false;
 192 }
 193
 194 static void
 195 str_to_action(char *str, struct ofpbuf *b)
 196 {
 197     char *act, *arg;
 198     char *saveptr = NULL;
 199     bool drop = false;
 200     int n_actions;
 201
 202     for (act = strtok_r(str, ", \t\r\n", &saveptr), n_actions = 0; act;
 203          act = strtok_r(NULL, ", \t\r\n", &saveptr), n_actions++)
 204     {
 205         uint16_t port;
 206
 207         if (drop) {
 208             ovs_fatal(0, "Drop actions must not be followed by other actions");
 209         }
 210
 211         /* Arguments are separated by colons */
 212         arg = strchr(act, ':');
 213         if (arg) {
 214             *arg = '\0';
 215             arg++;
 216         }
 217
 218         if (!strcasecmp(act, "mod_vlan_vid")) {
 219             struct ofp_action_vlan_vid *va;
 220             va = put_action(b, sizeof *va, OFPAT_SET_VLAN_VID);
 221             va->vlan_vid = htons(str_to_u32(arg));
 222         } else if (!strcasecmp(act, "mod_vlan_pcp")) {
 223             struct ofp_action_vlan_pcp *va;
 224             va = put_action(b, sizeof *va, OFPAT_SET_VLAN_PCP);
 225             va->vlan_pcp = str_to_u32(arg);
 226         } else if (!strcasecmp(act, "strip_vlan")) {
 227             struct ofp_action_header *ah;
 228             ah = put_action(b, sizeof *ah, OFPAT_STRIP_VLAN);
 229             ah->type = htons(OFPAT_STRIP_VLAN);
 230         } else if (!strcasecmp(act, "mod_dl_src")) {
 231             put_dl_addr_action(b, OFPAT_SET_DL_SRC, arg);
 232         } else if (!strcasecmp(act, "mod_dl_dst")) {
 233             put_dl_addr_action(b, OFPAT_SET_DL_DST, arg);
 234         } else if (!strcasecmp(act, "mod_nw_src")) {
 235             struct ofp_action_nw_addr *na;
 236             na = put_action(b, sizeof *na, OFPAT_SET_NW_SRC);
 237             str_to_ip(arg, &na->nw_addr, NULL);
 238         } else if (!strcasecmp(act, "mod_nw_dst")) {
 239             struct ofp_action_nw_addr *na;
 240             na = put_action(b, sizeof *na, OFPAT_SET_NW_DST);
 241             str_to_ip(arg, &na->nw_addr, NULL);
 242         } else if (!strcasecmp(act, "mod_tp_src")) {
 243             struct ofp_action_tp_port *ta;
 244             ta = put_action(b, sizeof *ta, OFPAT_SET_TP_SRC);
 245             ta->tp_port = htons(str_to_u32(arg));
 246         } else if (!strcasecmp(act, "mod_tp_dst")) {
 247             struct ofp_action_tp_port *ta;
 248             ta = put_action(b, sizeof *ta, OFPAT_SET_TP_DST);
 249             ta->tp_port = htons(str_to_u32(arg));
 250         } else if (!strcasecmp(act, "mod_nw_tos")) {
 251             struct ofp_action_nw_tos *nt;
 252             nt = put_action(b, sizeof *nt, OFPAT_SET_NW_TOS);
 253             nt->nw_tos = str_to_u32(arg);
 254         } else if (!strcasecmp(act, "resubmit")) {
 255             struct nx_action_resubmit *nar;
 256             nar = put_action(b, sizeof *nar, OFPAT_VENDOR);
 257             nar->vendor = htonl(NX_VENDOR_ID);
 258             nar->subtype = htons(NXAST_RESUBMIT);
 259             nar->in_port = htons(str_to_u32(arg));
 260         } else if (!strcasecmp(act, "set_tunnel")
 261                    || !strcasecmp(act, "set_tunnel64")) {
 262             uint64_t tun_id = str_to_u64(arg);
 263             if (!strcasecmp(act, "set_tunnel64") || tun_id > UINT32_MAX) {
 264                 struct nx_action_set_tunnel64 *nast64;
 265                 nast64 = put_action(b, sizeof *nast64, OFPAT_VENDOR);
 266                 nast64->vendor = htonl(NX_VENDOR_ID);
 267                 nast64->subtype = htons(NXAST_SET_TUNNEL64);
 268                 nast64->tun_id = htonll(tun_id);
 269             } else {
 270                 struct nx_action_set_tunnel *nast;
 271                 nast = put_action(b, sizeof *nast, OFPAT_VENDOR);
 272                 nast->vendor = htonl(NX_VENDOR_ID);
 273                 nast->subtype = htons(NXAST_SET_TUNNEL);
 274                 nast->tun_id = htonl(tun_id);
 275             }
 276         } else if (!strcasecmp(act, "drop_spoofed_arp")) {
 277             struct nx_action_header *nah;
 278             nah = put_action(b, sizeof *nah, OFPAT_VENDOR);
 279             nah->vendor = htonl(NX_VENDOR_ID);
 280             nah->subtype = htons(NXAST_DROP_SPOOFED_ARP);
 281         } else if (!strcasecmp(act, "set_queue")) {
 282             struct nx_action_set_queue *nasq;
 283             nasq = put_action(b, sizeof *nasq, OFPAT_VENDOR);
 284             nasq->vendor = htonl(NX_VENDOR_ID);
 285             nasq->subtype = htons(NXAST_SET_QUEUE);
 286             nasq->queue_id = htonl(str_to_u32(arg));
 287         } else if (!strcasecmp(act, "pop_queue")) {
 288             struct nx_action_header *nah;
 289             nah = put_action(b, sizeof *nah, OFPAT_VENDOR);
 290             nah->vendor = htonl(NX_VENDOR_ID);
 291             nah->subtype = htons(NXAST_POP_QUEUE);
 292         } else if (!strcasecmp(act, "note")) {
 293             size_t start_ofs = b->size;
 294             struct nx_action_note *nan;
 295             int remainder;
 296             size_t len;
 297
 298             nan = put_action(b, sizeof *nan, OFPAT_VENDOR);
 299             nan->vendor = htonl(NX_VENDOR_ID);
 300             nan->subtype = htons(NXAST_NOTE);
 301
 302             b->size -= sizeof nan->note;
 303             while (arg && *arg != '\0') {
 304                 uint8_t byte;
 305                 bool ok;
 306
 307                 if (*arg == '.') {
 308                     arg++;
 309                 }
 310                 if (*arg == '\0') {
 311                     break;
 312                 }
 313
 314                 byte = hexits_value(arg, 2, &ok);
 315                 if (!ok) {
 316                     ovs_fatal(0, "bad hex digit in `note' argument");
 317                 }
 318                 ofpbuf_put(b, &byte, 1);
 319
 320                 arg += 2;
 321             }
 322
 323             len = b->size - start_ofs;
 324             remainder = len % OFP_ACTION_ALIGN;
 325             if (remainder) {
 326                 ofpbuf_put_zeros(b, OFP_ACTION_ALIGN - remainder);
 327             }
 328             nan->len = htons(b->size - start_ofs);
 329         } else if (!strcasecmp(act, "move")) {
 330             struct nx_action_reg_move *move;
 331             move = ofpbuf_put_uninit(b, sizeof *move);
 332             nxm_parse_reg_move(move, arg);
 333         } else if (!strcasecmp(act, "load")) {
 334             struct nx_action_reg_load *load;
 335             load = ofpbuf_put_uninit(b, sizeof *load);
 336             nxm_parse_reg_load(load, arg);
 337         } else if (!strcasecmp(act, "output")) {
 338             put_output_action(b, str_to_u32(arg));
 339         } else if (!strcasecmp(act, "enqueue")) {
 340             char *sp = NULL;
 341             char *port_s = strtok_r(arg, ":q", &sp);
 342             char *queue = strtok_r(NULL, "", &sp);
 343             if (port_s == NULL || queue == NULL) {
 344                 ovs_fatal(0, "\"enqueue\" syntax is \"enqueue:PORT:QUEUE\"");
 345             }
 346             put_enqueue_action(b, str_to_u32(port_s), str_to_u32(queue));
 347         } else if (!strcasecmp(act, "drop")) {
 348             /* A drop action in OpenFlow occurs by just not setting
 349              * an action. */
 350             drop = true;
 351             if (n_actions) {
 352                 ovs_fatal(0, "Drop actions must not be preceded by other "
 353                           "actions");
 354             }
 355         } else if (!strcasecmp(act, "CONTROLLER")) {
 356             struct ofp_action_output *oao;
 357             oao = put_output_action(b, OFPP_CONTROLLER);
 358
 359             /* Unless a numeric argument is specified, we send the whole
 360              * packet to the controller. */
 361             if (arg && (strspn(arg, "0123456789") == strlen(arg))) {
 362                oao->max_len = htons(str_to_u32(arg));
 363             } else {
 364                 oao->max_len = htons(UINT16_MAX);
 365             }
 366         } else if (parse_port_name(act, &port)) {
 367             put_output_action(b, port);
 368         } else if (strspn(act, "0123456789") == strlen(act)) {
 369             put_output_action(b, str_to_u32(act));
 370         } else {
 371             ovs_fatal(0, "Unknown action: %s", act);
 372         }
 373     }
 374 }
 375
 376 struct protocol {
 377     const char *name;
 378     uint16_t dl_type;
 379     uint8_t nw_proto;
 380 };
 381
 382 static bool
 383 parse_protocol(const char *name, const struct protocol **p_out)
 384 {
 385     static const struct protocol protocols[] = {
 386         { "ip", ETH_TYPE_IP, 0 },
 387         { "arp", ETH_TYPE_ARP, 0 },
 388         { "icmp", ETH_TYPE_IP, IP_TYPE_ICMP },
 389         { "tcp", ETH_TYPE_IP, IP_TYPE_TCP },
 390         { "udp", ETH_TYPE_IP, IP_TYPE_UDP },
 391     };
 392     const struct protocol *p;
 393
 394     for (p = protocols; p < &protocols[ARRAY_SIZE(protocols)]; p++) {
 395         if (!strcmp(p->name, name)) {
 396             *p_out = p;
 397             return true;
 398         }
 399     }
 400     *p_out = NULL;
 401     return false;
 402 }
 403
 404 #define FIELDS                                              \
 405     FIELD(F_TUN_ID,      "tun_id",      FWW_TUN_ID)         \
 406     FIELD(F_IN_PORT,     "in_port",     FWW_IN_PORT)        \
 407     FIELD(F_DL_VLAN,     "dl_vlan",     0)                  \
 408     FIELD(F_DL_VLAN_PCP, "dl_vlan_pcp", 0)                  \
 409     FIELD(F_DL_SRC,      "dl_src",      FWW_DL_SRC)         \
 410     FIELD(F_DL_DST,      "dl_dst",      FWW_DL_DST)         \
 411     FIELD(F_DL_TYPE,     "dl_type",     FWW_DL_TYPE)        \
 412     FIELD(F_NW_SRC,      "nw_src",      0)                  \
 413     FIELD(F_NW_DST,      "nw_dst",      0)                  \
 414     FIELD(F_NW_PROTO,    "nw_proto",    FWW_NW_PROTO)       \
 415     FIELD(F_NW_TOS,      "nw_tos",      FWW_NW_TOS)         \
 416     FIELD(F_TP_SRC,      "tp_src",      FWW_TP_SRC)         \
 417     FIELD(F_TP_DST,      "tp_dst",      FWW_TP_DST)         \
 418     FIELD(F_ICMP_TYPE,   "icmp_type",   FWW_TP_SRC)         \
 419     FIELD(F_ICMP_CODE,   "icmp_code",   FWW_TP_DST)
 420
 421 enum field_index {
 422 #define FIELD(ENUM, NAME, WILDCARD) ENUM,
 423     FIELDS
 424 #undef FIELD
 425     N_FIELDS
 426 };
 427
 428 struct field {
 429     enum field_index index;
 430     const char *name;
 431     flow_wildcards_t wildcard;  /* FWW_* bit. */
 432 };
 433
 434 static bool
 435 parse_field_name(const char *name, const struct field **f_out)
 436 {
 437     static const struct field fields[N_FIELDS] = {
 438 #define FIELD(ENUM, NAME, WILDCARD) { ENUM, NAME, WILDCARD },
 439         FIELDS
 440 #undef FIELD
 441     };
 442     const struct field *f;
 443
 444     for (f = fields; f < &fields[ARRAY_SIZE(fields)]; f++) {
 445         if (!strcmp(f->name, name)) {
 446             *f_out = f;
 447             return true;
 448         }
 449     }
 450     *f_out = NULL;
 451     return false;
 452 }
 453
 454 static void
 455 parse_field_value(struct cls_rule *rule, enum field_index index,
 456                   const char *value)
 457 {
 458     uint8_t mac[ETH_ADDR_LEN];
 459     ovs_be32 ip, mask;
 460     uint16_t port_no;
 461
 462     switch (index) {
 463     case F_TUN_ID:
 464         cls_rule_set_tun_id(rule, htonll(str_to_u64(value)));
 465         break;
 466
 467     case F_IN_PORT:
 468         if (!parse_port_name(value, &port_no)) {
 469             port_no = atoi(value);
 470         }
 471         if (port_no == OFPP_LOCAL) {
 472             port_no = ODPP_LOCAL;
 473         }
 474         cls_rule_set_in_port(rule, port_no);
 475         break;
 476
 477     case F_DL_VLAN:
 478         cls_rule_set_dl_vlan(rule, htons(str_to_u32(value)));
 479         break;
 480
 481     case F_DL_VLAN_PCP:
 482         cls_rule_set_dl_vlan_pcp(rule, str_to_u32(value));
 483         break;
 484
 485     case F_DL_SRC:
 486         str_to_mac(value, mac);
 487         cls_rule_set_dl_src(rule, mac);
 488         break;
 489
 490     case F_DL_DST:
 491         str_to_mac(value, mac);
 492         cls_rule_set_dl_dst(rule, mac);
 493         break;
 494
 495     case F_DL_TYPE:
 496         cls_rule_set_dl_type(rule, htons(str_to_u32(value)));
 497         break;
 498
 499     case F_NW_SRC:
 500         str_to_ip(value, &ip, &mask);
 501         cls_rule_set_nw_src_masked(rule, ip, mask);
 502         break;
 503
 504     case F_NW_DST:
 505         str_to_ip(value, &ip, &mask);
 506         cls_rule_set_nw_dst_masked(rule, ip, mask);
 507         break;
 508
 509     case F_NW_PROTO:
 510         cls_rule_set_nw_proto(rule, str_to_u32(value));
 511         break;
 512
 513     case F_NW_TOS:
 514         cls_rule_set_nw_tos(rule, str_to_u32(value));
 515         break;
 516
 517     case F_TP_SRC:
 518         cls_rule_set_tp_src(rule, htons(str_to_u32(value)));
 519         break;
 520
 521     case F_TP_DST:
 522         cls_rule_set_tp_dst(rule, htons(str_to_u32(value)));
 523         break;
 524
 525     case F_ICMP_TYPE:
 526         cls_rule_set_icmp_type(rule, str_to_u32(value));
 527         break;
 528
 529     case F_ICMP_CODE:
 530         cls_rule_set_icmp_code(rule, str_to_u32(value));
 531         break;
 532
 533     case N_FIELDS:
 534         NOT_REACHED();
 535     }
 536 }
 537
 538 static void
 539 parse_reg_value(struct cls_rule *rule, int reg_idx, const char *value)
 540 {
 541     uint32_t reg_value, reg_mask;
 542
 543     if (!strcmp(value, "ANY") || !strcmp(value, "*")) {
 544         cls_rule_set_reg_masked(rule, reg_idx, 0, 0);
 545     } else if (sscanf(value, "%"SCNi32"/%"SCNi32,
 546                       &reg_value, &reg_mask) == 2) {
 547         cls_rule_set_reg_masked(rule, reg_idx, reg_value, reg_mask);
 548     } else if (sscanf(value, "%"SCNi32, &reg_value)) {
 549         cls_rule_set_reg(rule, reg_idx, reg_value);
 550     } else {
 551         ovs_fatal(0, "register fields must take the form <value> "
 552                   "or <value>/<mask>");
 553     }
 554 }
 555
 556 /* Convert 'string' (as described in the Flow Syntax section of the ovs-ofctl
 557  * man page) into 'pf'.  If 'actions' is specified, an action must be in
 558  * 'string' and may be expanded or reallocated. */
 559 static void
 560 parse_ofp_str(struct flow_mod *fm, uint8_t *table_idx,
 561               struct ofpbuf *actions, char *string)
 562 {
 563     char *save_ptr = NULL;
 564     char *name;
 565
 566     if (table_idx) {
 567         *table_idx = 0xff;
 568     }
 569     cls_rule_init_catchall(&fm->cr, OFP_DEFAULT_PRIORITY);
 570     fm->cookie = htonll(0);
 571     fm->command = UINT16_MAX;
 572     fm->idle_timeout = OFP_FLOW_PERMANENT;
 573     fm->hard_timeout = OFP_FLOW_PERMANENT;
 574     fm->buffer_id = UINT32_MAX;
 575     fm->out_port = OFPP_NONE;
 576     fm->flags = 0;
 577     if (actions) {
 578         char *act_str = strstr(string, "action");
 579         if (!act_str) {
 580             ovs_fatal(0, "must specify an action");
 581         }
 582         *act_str = '\0';
 583
 584         act_str = strchr(act_str + 1, '=');
 585         if (!act_str) {
 586             ovs_fatal(0, "must specify an action");
 587         }
 588
 589         act_str++;
 590
 591         str_to_action(act_str, actions);
 592         fm->actions = actions->data;
 593         fm->n_actions = actions->size / sizeof(union ofp_action);
 594     } else {
 595         fm->actions = NULL;
 596         fm->n_actions = 0;
 597     }
 598     for (name = strtok_r(string, "=, \t\r\n", &save_ptr); name;
 599          name = strtok_r(NULL, "=, \t\r\n", &save_ptr)) {
 600         const struct protocol *p;
 601
 602         if (parse_protocol(name, &p)) {
 603             cls_rule_set_dl_type(&fm->cr, htons(p->dl_type));
 604             if (p->nw_proto) {
 605                 cls_rule_set_nw_proto(&fm->cr, p->nw_proto);
 606             }
 607         } else {
 608             const struct field *f;
 609             char *value;
 610
 611             value = strtok_r(NULL, ", \t\r\n", &save_ptr);
 612             if (!value) {
 613                 ovs_fatal(0, "field %s missing value", name);
 614             }
 615
 616             if (table_idx && !strcmp(name, "table")) {
 617                 *table_idx = atoi(value);
 618             } else if (!strcmp(name, "out_port")) {
 619                 fm->out_port = atoi(value);
 620             } else if (!strcmp(name, "priority")) {
 621                 fm->cr.priority = atoi(value);
 622             } else if (!strcmp(name, "idle_timeout")) {
 623                 fm->idle_timeout = atoi(value);
 624             } else if (!strcmp(name, "hard_timeout")) {
 625                 fm->hard_timeout = atoi(value);
 626             } else if (!strcmp(name, "cookie")) {
 627                 fm->cookie = htonll(str_to_u64(value));
 628             } else if (parse_field_name(name, &f)) {
 629                 if (!strcmp(value, "*") || !strcmp(value, "ANY")) {
 630                     if (f->wildcard) {
 631                         fm->cr.wc.wildcards |= f->wildcard;
 632                         cls_rule_zero_wildcarded_fields(&fm->cr);
 633                     } else if (f->index == F_NW_SRC) {
 634                         cls_rule_set_nw_src_masked(&fm->cr, 0, 0);
 635                     } else if (f->index == F_NW_DST) {
 636                         cls_rule_set_nw_dst_masked(&fm->cr, 0, 0);
 637                     } else if (f->index == F_DL_VLAN) {
 638                         cls_rule_set_any_vid(&fm->cr);
 639                     } else if (f->index == F_DL_VLAN_PCP) {
 640                         cls_rule_set_any_pcp(&fm->cr);
 641                     } else {
 642                         NOT_REACHED();
 643                     }
 644                 } else {
 645                     parse_field_value(&fm->cr, f->index, value);
 646                 }
 647             } else if (!strncmp(name, "reg", 3) && isdigit(name[3])) {
 648                 unsigned int reg_idx = atoi(name + 3);
 649                 if (reg_idx >= FLOW_N_REGS) {
 650                     ovs_fatal(0, "only %d registers supported", FLOW_N_REGS);
 651                 }
 652                 parse_reg_value(&fm->cr, reg_idx, value);
 653             } else {
 654                 ovs_fatal(0, "unknown keyword %s", name);
 655             }
 656         }
 657     }
 658 }
 659
 660 /* Parses 'string' as an OFPT_FLOW_MOD or NXT_FLOW_MOD with command 'command'
 661  * (one of OFPFC_*) and appends the parsed OpenFlow message to 'packets'.
 662  * '*cur_format' should initially contain the flow format currently configured
 663  * on the connection; this function will add a message to change the flow
 664  * format and update '*cur_format', if this is necessary to add the parsed
 665  * flow. */
 666 void
 667 parse_ofp_flow_mod_str(struct list *packets, enum nx_flow_format *cur_format,
 668                        char *string, uint16_t command)
 669 {
 670     bool is_del = command == OFPFC_DELETE || command == OFPFC_DELETE_STRICT;
 671     enum nx_flow_format min_format, next_format;
 672     struct ofpbuf actions;
 673     struct ofpbuf *ofm;
 674     struct flow_mod fm;
 675
 676     ofpbuf_init(&actions, 64);
 677     parse_ofp_str(&fm, NULL, is_del ? NULL : &actions, string);
 678     fm.command = command;
 679
 680     min_format = ofputil_min_flow_format(&fm.cr, true, fm.cookie);
 681     next_format = MAX(*cur_format, min_format);
 682     if (next_format != *cur_format) {
 683         struct ofpbuf *sff = ofputil_make_set_flow_format(next_format);
 684         list_push_back(packets, &sff->list_node);
 685         *cur_format = next_format;
 686     }
 687
 688     ofm = ofputil_encode_flow_mod(&fm, *cur_format);
 689     list_push_back(packets, &ofm->list_node);
 690
 691     ofpbuf_uninit(&actions);
 692 }
 693
 694 /* Similar to parse_ofp_flow_mod_str(), except that the string is read from
 695  * 'stream' and the command is always OFPFC_ADD.  Returns false if end-of-file
 696  * is reached before reading a flow, otherwise true. */
 697 bool
 698 parse_ofp_add_flow_file(struct list *packets, enum nx_flow_format *cur,
 699                         FILE *stream)
 700 {
 701     struct ds s = DS_EMPTY_INITIALIZER;
 702     bool ok = false;
 703
 704     while (!ds_get_line(&s, stream)) {
 705         char *line = ds_cstr(&s);
 706         char *comment;
 707
 708         /* Delete comments. */
 709         comment = strchr(line, '#');
 710         if (comment) {
 711             *comment = '\0';
 712         }
 713
 714         /* Drop empty lines. */
 715         if (line[strspn(line, " \t\n")] == '\0') {
 716             continue;
 717         }
 718
 719         parse_ofp_flow_mod_str(packets, cur, line, OFPFC_ADD);
 720         ok = true;
 721         break;
 722     }
 723     ds_destroy(&s);
 724
 725     return ok;
 726 }
 727
 728 void
 729 parse_ofp_flow_stats_request_str(struct flow_stats_request *fsr,
 730                                  bool aggregate, char *string)
 731 {
 732     struct flow_mod fm;
 733     uint8_t table_id;
 734
 735     parse_ofp_str(&fm, &table_id, NULL, string);
 736     fsr->aggregate = aggregate;
 737     fsr->match = fm.cr;
 738     fsr->out_port = fm.out_port;
 739     fsr->table_id = table_id;
 740 }
 741