lib/ofp-parse.c

   1 /*
   2  * Copyright (c) 2010, 2011 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 "multipath.h"
  29 #include "nx-match.h"
  30 #include "ofp-util.h"
  31 #include "ofpbuf.h"
  32 #include "openflow/openflow.h"
  33 #include "packets.h"
  34 #include "socket-util.h"
  35 #include "vconn.h"
  36 #include "vlog.h"
  37
  38 VLOG_DEFINE_THIS_MODULE(ofp_parse);
  39
  40 static uint32_t
  41 str_to_u32(const char *str)
  42 {
  43     char *tail;
  44     uint32_t value;
  45
  46     if (!str[0]) {
  47         ovs_fatal(0, "missing required numeric argument");
  48     }
  49
  50     errno = 0;
  51     value = strtoul(str, &tail, 0);
  52     if (errno == EINVAL || errno == ERANGE || *tail) {
  53         ovs_fatal(0, "invalid numeric format %s", str);
  54     }
  55     return value;
  56 }
  57
  58 static uint64_t
  59 str_to_u64(const char *str)
  60 {
  61     char *tail;
  62     uint64_t value;
  63
  64     if (!str[0]) {
  65         ovs_fatal(0, "missing required numeric argument");
  66     }
  67
  68     errno = 0;
  69     value = strtoull(str, &tail, 0);
  70     if (errno == EINVAL || errno == ERANGE || *tail) {
  71         ovs_fatal(0, "invalid numeric format %s", str);
  72     }
  73     return value;
  74 }
  75
  76 static void
  77 str_to_mac(const char *str, uint8_t mac[6])
  78 {
  79     if (sscanf(str, ETH_ADDR_SCAN_FMT, ETH_ADDR_SCAN_ARGS(mac))
  80         != ETH_ADDR_SCAN_COUNT) {
  81         ovs_fatal(0, "invalid mac address %s", str);
  82     }
  83 }
  84
  85 static void
  86 str_to_ip(const char *str_, ovs_be32 *ip, ovs_be32 *maskp)
  87 {
  88     char *str = xstrdup(str_);
  89     char *save_ptr = NULL;
  90     const char *name, *netmask;
  91     struct in_addr in_addr;
  92     ovs_be32 mask;
  93     int retval;
  94
  95     name = strtok_r(str, "/", &save_ptr);
  96     retval = name ? lookup_ip(name, &in_addr) : EINVAL;
  97     if (retval) {
  98         ovs_fatal(0, "%s: could not convert to IP address", str);
  99     }
 100     *ip = in_addr.s_addr;
 101
 102     netmask = strtok_r(NULL, "/", &save_ptr);
 103     if (netmask) {
 104         uint8_t o[4];
 105         if (sscanf(netmask, "%"SCNu8".%"SCNu8".%"SCNu8".%"SCNu8,
 106                    &o[0], &o[1], &o[2], &o[3]) == 4) {
 107             mask = htonl((o[0] << 24) | (o[1] << 16) | (o[2] << 8) | o[3]);
 108         } else {
 109             int prefix = atoi(netmask);
 110             if (prefix <= 0 || prefix > 32) {
 111                 ovs_fatal(0, "%s: network prefix bits not between 1 and 32",
 112                           str);
 113             } else if (prefix == 32) {
 114                 mask = htonl(UINT32_MAX);
 115             } else {
 116                 mask = htonl(((1u << prefix) - 1) << (32 - prefix));
 117             }
 118         }
 119     } else {
 120         mask = htonl(UINT32_MAX);
 121     }
 122     *ip &= mask;
 123
 124     if (maskp) {
 125         *maskp = mask;
 126     } else {
 127         if (mask != htonl(UINT32_MAX)) {
 128             ovs_fatal(0, "%s: netmask not allowed here", str_);
 129         }
 130     }
 131
 132     free(str);
 133 }
 134
 135 static void
 136 str_to_tun_id(const char *str, ovs_be64 *tun_idp, ovs_be64 *maskp)
 137 {
 138     uint64_t tun_id, mask;
 139     char *tail;
 140
 141     errno = 0;
 142     tun_id = strtoull(str, &tail, 0);
 143     if (errno || (*tail != '\0' && *tail != '/')) {
 144         goto error;
 145     }
 146
 147     if (*tail == '/') {
 148         mask = strtoull(tail + 1, &tail, 0);
 149         if (errno || *tail != '\0') {
 150             goto error;
 151         }
 152     } else {
 153         mask = UINT64_MAX;
 154     }
 155
 156     *tun_idp = htonll(tun_id);
 157     *maskp = htonll(mask);
 158     return;
 159
 160 error:
 161     ovs_fatal(0, "%s: bad syntax for tunnel id", str);
 162 }
 163
 164 static void
 165 str_to_ipv6(const char *str_, struct in6_addr *addrp, struct in6_addr *maskp)
 166 {
 167     char *str = xstrdup(str_);
 168     char *save_ptr = NULL;
 169     const char *name, *netmask;
 170     struct in6_addr addr, mask;
 171     int retval;
 172
 173     name = strtok_r(str, "/", &save_ptr);
 174     retval = name ? lookup_ipv6(name, &addr) : EINVAL;
 175     if (retval) {
 176         ovs_fatal(0, "%s: could not convert to IPv6 address", str);
 177     }
 178
 179     netmask = strtok_r(NULL, "/", &save_ptr);
 180     if (netmask) {
 181         int prefix = atoi(netmask);
 182         if (prefix <= 0 || prefix > 128) {
 183             ovs_fatal(0, "%s: network prefix bits not between 1 and 128",
 184                       str);
 185         } else {
 186             mask = ipv6_create_mask(prefix);
 187         }
 188     } else {
 189         mask = in6addr_exact;
 190     }
 191     *addrp = ipv6_addr_bitand(&addr, &mask);
 192
 193     if (maskp) {
 194         *maskp = mask;
 195     } else {
 196         if (!ipv6_mask_is_exact(&mask)) {
 197             ovs_fatal(0, "%s: netmask not allowed here", str_);
 198         }
 199     }
 200
 201     free(str);
 202 }
 203
 204 static void *
 205 put_action(struct ofpbuf *b, size_t size, uint16_t type)
 206 {
 207     struct ofp_action_header *ah = ofpbuf_put_zeros(b, size);
 208     ah->type = htons(type);
 209     ah->len = htons(size);
 210     return ah;
 211 }
 212
 213 static struct ofp_action_output *
 214 put_output_action(struct ofpbuf *b, uint16_t port)
 215 {
 216     struct ofp_action_output *oao = put_action(b, sizeof *oao, OFPAT_OUTPUT);
 217     oao->port = htons(port);
 218     return oao;
 219 }
 220
 221 static void
 222 put_enqueue_action(struct ofpbuf *b, uint16_t port, uint32_t queue)
 223 {
 224     struct ofp_action_enqueue *oae = put_action(b, sizeof *oae, OFPAT_ENQUEUE);
 225     oae->port = htons(port);
 226     oae->queue_id = htonl(queue);
 227 }
 228
 229 static void
 230 put_dl_addr_action(struct ofpbuf *b, uint16_t type, const char *addr)
 231 {
 232     struct ofp_action_dl_addr *oada = put_action(b, sizeof *oada, type);
 233     str_to_mac(addr, oada->dl_addr);
 234 }
 235
 236
 237 static bool
 238 parse_port_name(const char *name, uint16_t *port)
 239 {
 240     struct pair {
 241         const char *name;
 242         uint16_t value;
 243     };
 244     static const struct pair pairs[] = {
 245 #define DEF_PAIR(NAME) {#NAME, OFPP_##NAME}
 246         DEF_PAIR(IN_PORT),
 247         DEF_PAIR(TABLE),
 248         DEF_PAIR(NORMAL),
 249         DEF_PAIR(FLOOD),
 250         DEF_PAIR(ALL),
 251         DEF_PAIR(CONTROLLER),
 252         DEF_PAIR(LOCAL),
 253         DEF_PAIR(NONE),
 254 #undef DEF_PAIR
 255     };
 256     static const int n_pairs = ARRAY_SIZE(pairs);
 257     size_t i;
 258
 259     for (i = 0; i < n_pairs; i++) {
 260         if (!strcasecmp(name, pairs[i].name)) {
 261             *port = pairs[i].value;
 262             return true;
 263         }
 264     }
 265     return false;
 266 }
 267
 268 static void
 269 str_to_action(char *str, struct ofpbuf *b)
 270 {
 271     bool drop = false;
 272     int n_actions;
 273     char *pos;
 274
 275     pos = str;
 276     n_actions = 0;
 277     for (;;) {
 278         char empty_string[] = "";
 279         char *act, *arg;
 280         size_t actlen;
 281         uint16_t port;
 282
 283         pos += strspn(pos, ", \t\r\n");
 284         if (*pos == '\0') {
 285             break;
 286         }
 287
 288         if (drop) {
 289             ovs_fatal(0, "Drop actions must not be followed by other actions");
 290         }
 291
 292         act = pos;
 293         actlen = strcspn(pos, ":(, \t\r\n");
 294         if (act[actlen] == ':') {
 295             /* The argument can be separated by a colon. */
 296             size_t arglen;
 297
 298             arg = act + actlen + 1;
 299             arglen = strcspn(arg, ", \t\r\n");
 300             pos = arg + arglen + (arg[arglen] != '\0');
 301             arg[arglen] = '\0';
 302         } else if (act[actlen] == '(') {
 303             /* The argument can be surrounded by balanced parentheses.  The
 304              * outermost set of parentheses is removed. */
 305             int level = 1;
 306             size_t arglen;
 307
 308             arg = act + actlen + 1;
 309             for (arglen = 0; level > 0; arglen++) {
 310                 switch (arg[arglen]) {
 311                 case '\0':
 312                     ovs_fatal(0, "unbalanced parentheses in argument to %s "
 313                               "action", act);
 314
 315                 case '(':
 316                     level++;
 317                     break;
 318
 319                 case ')':
 320                     level--;
 321                     break;
 322                 }
 323             }
 324             arg[arglen - 1] = '\0';
 325             pos = arg + arglen;
 326         } else {
 327             /* There might be no argument at all. */
 328             arg = empty_string;
 329             pos = act + actlen + (act[actlen] != '\0');
 330         }
 331         act[actlen] = '\0';
 332
 333         if (!strcasecmp(act, "mod_vlan_vid")) {
 334             struct ofp_action_vlan_vid *va;
 335             va = put_action(b, sizeof *va, OFPAT_SET_VLAN_VID);
 336             va->vlan_vid = htons(str_to_u32(arg));
 337         } else if (!strcasecmp(act, "mod_vlan_pcp")) {
 338             struct ofp_action_vlan_pcp *va;
 339             va = put_action(b, sizeof *va, OFPAT_SET_VLAN_PCP);
 340             va->vlan_pcp = str_to_u32(arg);
 341         } else if (!strcasecmp(act, "strip_vlan")) {
 342             struct ofp_action_header *ah;
 343             ah = put_action(b, sizeof *ah, OFPAT_STRIP_VLAN);
 344             ah->type = htons(OFPAT_STRIP_VLAN);
 345         } else if (!strcasecmp(act, "mod_dl_src")) {
 346             put_dl_addr_action(b, OFPAT_SET_DL_SRC, arg);
 347         } else if (!strcasecmp(act, "mod_dl_dst")) {
 348             put_dl_addr_action(b, OFPAT_SET_DL_DST, arg);
 349         } else if (!strcasecmp(act, "mod_nw_src")) {
 350             struct ofp_action_nw_addr *na;
 351             na = put_action(b, sizeof *na, OFPAT_SET_NW_SRC);
 352             str_to_ip(arg, &na->nw_addr, NULL);
 353         } else if (!strcasecmp(act, "mod_nw_dst")) {
 354             struct ofp_action_nw_addr *na;
 355             na = put_action(b, sizeof *na, OFPAT_SET_NW_DST);
 356             str_to_ip(arg, &na->nw_addr, NULL);
 357         } else if (!strcasecmp(act, "mod_tp_src")) {
 358             struct ofp_action_tp_port *ta;
 359             ta = put_action(b, sizeof *ta, OFPAT_SET_TP_SRC);
 360             ta->tp_port = htons(str_to_u32(arg));
 361         } else if (!strcasecmp(act, "mod_tp_dst")) {
 362             struct ofp_action_tp_port *ta;
 363             ta = put_action(b, sizeof *ta, OFPAT_SET_TP_DST);
 364             ta->tp_port = htons(str_to_u32(arg));
 365         } else if (!strcasecmp(act, "mod_nw_tos")) {
 366             struct ofp_action_nw_tos *nt;
 367             nt = put_action(b, sizeof *nt, OFPAT_SET_NW_TOS);
 368             nt->nw_tos = str_to_u32(arg);
 369         } else if (!strcasecmp(act, "resubmit")) {
 370             struct nx_action_resubmit *nar;
 371             nar = put_action(b, sizeof *nar, OFPAT_VENDOR);
 372             nar->vendor = htonl(NX_VENDOR_ID);
 373             nar->subtype = htons(NXAST_RESUBMIT);
 374             nar->in_port = htons(str_to_u32(arg));
 375         } else if (!strcasecmp(act, "set_tunnel")
 376                    || !strcasecmp(act, "set_tunnel64")) {
 377             uint64_t tun_id = str_to_u64(arg);
 378             if (!strcasecmp(act, "set_tunnel64") || tun_id > UINT32_MAX) {
 379                 struct nx_action_set_tunnel64 *nast64;
 380                 nast64 = put_action(b, sizeof *nast64, OFPAT_VENDOR);
 381                 nast64->vendor = htonl(NX_VENDOR_ID);
 382                 nast64->subtype = htons(NXAST_SET_TUNNEL64);
 383                 nast64->tun_id = htonll(tun_id);
 384             } else {
 385                 struct nx_action_set_tunnel *nast;
 386                 nast = put_action(b, sizeof *nast, OFPAT_VENDOR);
 387                 nast->vendor = htonl(NX_VENDOR_ID);
 388                 nast->subtype = htons(NXAST_SET_TUNNEL);
 389                 nast->tun_id = htonl(tun_id);
 390             }
 391         } else if (!strcasecmp(act, "drop_spoofed_arp")) {
 392             struct nx_action_header *nah;
 393             nah = put_action(b, sizeof *nah, OFPAT_VENDOR);
 394             nah->vendor = htonl(NX_VENDOR_ID);
 395             nah->subtype = htons(NXAST_DROP_SPOOFED_ARP);
 396         } else if (!strcasecmp(act, "set_queue")) {
 397             struct nx_action_set_queue *nasq;
 398             nasq = put_action(b, sizeof *nasq, OFPAT_VENDOR);
 399             nasq->vendor = htonl(NX_VENDOR_ID);
 400             nasq->subtype = htons(NXAST_SET_QUEUE);
 401             nasq->queue_id = htonl(str_to_u32(arg));
 402         } else if (!strcasecmp(act, "pop_queue")) {
 403             struct nx_action_header *nah;
 404             nah = put_action(b, sizeof *nah, OFPAT_VENDOR);
 405             nah->vendor = htonl(NX_VENDOR_ID);
 406             nah->subtype = htons(NXAST_POP_QUEUE);
 407         } else if (!strcasecmp(act, "note")) {
 408             size_t start_ofs = b->size;
 409             struct nx_action_note *nan;
 410             int remainder;
 411             size_t len;
 412
 413             nan = put_action(b, sizeof *nan, OFPAT_VENDOR);
 414             nan->vendor = htonl(NX_VENDOR_ID);
 415             nan->subtype = htons(NXAST_NOTE);
 416
 417             b->size -= sizeof nan->note;
 418             while (*arg != '\0') {
 419                 uint8_t byte;
 420                 bool ok;
 421
 422                 if (*arg == '.') {
 423                     arg++;
 424                 }
 425                 if (*arg == '\0') {
 426                     break;
 427                 }
 428
 429                 byte = hexits_value(arg, 2, &ok);
 430                 if (!ok) {
 431                     ovs_fatal(0, "bad hex digit in `note' argument");
 432                 }
 433                 ofpbuf_put(b, &byte, 1);
 434
 435                 arg += 2;
 436             }
 437
 438             len = b->size - start_ofs;
 439             remainder = len % OFP_ACTION_ALIGN;
 440             if (remainder) {
 441                 ofpbuf_put_zeros(b, OFP_ACTION_ALIGN - remainder);
 442             }
 443             nan->len = htons(b->size - start_ofs);
 444         } else if (!strcasecmp(act, "move")) {
 445             struct nx_action_reg_move *move;
 446             move = ofpbuf_put_uninit(b, sizeof *move);
 447             nxm_parse_reg_move(move, arg);
 448         } else if (!strcasecmp(act, "load")) {
 449             struct nx_action_reg_load *load;
 450             load = ofpbuf_put_uninit(b, sizeof *load);
 451             nxm_parse_reg_load(load, arg);
 452         } else if (!strcasecmp(act, "multipath")) {
 453             struct nx_action_multipath *nam;
 454             nam = ofpbuf_put_uninit(b, sizeof *nam);
 455             multipath_parse(nam, arg);
 456         } else if (!strcasecmp(act, "output")) {
 457             put_output_action(b, str_to_u32(arg));
 458         } else if (!strcasecmp(act, "enqueue")) {
 459             char *sp = NULL;
 460             char *port_s = strtok_r(arg, ":q", &sp);
 461             char *queue = strtok_r(NULL, "", &sp);
 462             if (port_s == NULL || queue == NULL) {
 463                 ovs_fatal(0, "\"enqueue\" syntax is \"enqueue:PORT:QUEUE\"");
 464             }
 465             put_enqueue_action(b, str_to_u32(port_s), str_to_u32(queue));
 466         } else if (!strcasecmp(act, "drop")) {
 467             /* A drop action in OpenFlow occurs by just not setting
 468              * an action. */
 469             drop = true;
 470             if (n_actions) {
 471                 ovs_fatal(0, "Drop actions must not be preceded by other "
 472                           "actions");
 473             }
 474         } else if (!strcasecmp(act, "CONTROLLER")) {
 475             struct ofp_action_output *oao;
 476             oao = put_output_action(b, OFPP_CONTROLLER);
 477
 478             /* Unless a numeric argument is specified, we send the whole
 479              * packet to the controller. */
 480             if (arg[0] && (strspn(arg, "0123456789") == strlen(arg))) {
 481                oao->max_len = htons(str_to_u32(arg));
 482             } else {
 483                 oao->max_len = htons(UINT16_MAX);
 484             }
 485         } else if (parse_port_name(act, &port)) {
 486             put_output_action(b, port);
 487         } else if (strspn(act, "0123456789") == strlen(act)) {
 488             put_output_action(b, str_to_u32(act));
 489         } else {
 490             ovs_fatal(0, "Unknown action: %s", act);
 491         }
 492         n_actions++;
 493     }
 494 }
 495
 496 struct protocol {
 497     const char *name;
 498     uint16_t dl_type;
 499     uint8_t nw_proto;
 500 };
 501
 502 static bool
 503 parse_protocol(const char *name, const struct protocol **p_out)
 504 {
 505     static const struct protocol protocols[] = {
 506         { "ip", ETH_TYPE_IP, 0 },
 507         { "arp", ETH_TYPE_ARP, 0 },
 508         { "icmp", ETH_TYPE_IP, IPPROTO_ICMP },
 509         { "tcp", ETH_TYPE_IP, IPPROTO_TCP },
 510         { "udp", ETH_TYPE_IP, IPPROTO_UDP },
 511         { "ipv6", ETH_TYPE_IPV6, 0 },
 512         { "ip6", ETH_TYPE_IPV6, 0 },
 513         { "icmp6", ETH_TYPE_IPV6, IPPROTO_ICMPV6 },
 514         { "tcp6", ETH_TYPE_IPV6, IPPROTO_TCP },
 515         { "udp6", ETH_TYPE_IPV6, IPPROTO_UDP },
 516     };
 517     const struct protocol *p;
 518
 519     for (p = protocols; p < &protocols[ARRAY_SIZE(protocols)]; p++) {
 520         if (!strcmp(p->name, name)) {
 521             *p_out = p;
 522             return true;
 523         }
 524     }
 525     *p_out = NULL;
 526     return false;
 527 }
 528
 529 #define FIELDS                                              \
 530     FIELD(F_TUN_ID,      "tun_id",      0)                  \
 531     FIELD(F_IN_PORT,     "in_port",     FWW_IN_PORT)        \
 532     FIELD(F_DL_VLAN,     "dl_vlan",     0)                  \
 533     FIELD(F_DL_VLAN_PCP, "dl_vlan_pcp", 0)                  \
 534     FIELD(F_DL_SRC,      "dl_src",      FWW_DL_SRC)         \
 535     FIELD(F_DL_DST,      "dl_dst",      FWW_DL_DST)         \
 536     FIELD(F_DL_TYPE,     "dl_type",     FWW_DL_TYPE)        \
 537     FIELD(F_NW_SRC,      "nw_src",      0)                  \
 538     FIELD(F_NW_DST,      "nw_dst",      0)                  \
 539     FIELD(F_NW_PROTO,    "nw_proto",    FWW_NW_PROTO)       \
 540     FIELD(F_NW_TOS,      "nw_tos",      FWW_NW_TOS)         \
 541     FIELD(F_TP_SRC,      "tp_src",      FWW_TP_SRC)         \
 542     FIELD(F_TP_DST,      "tp_dst",      FWW_TP_DST)         \
 543     FIELD(F_ICMP_TYPE,   "icmp_type",   FWW_TP_SRC)         \
 544     FIELD(F_ICMP_CODE,   "icmp_code",   FWW_TP_DST)         \
 545     FIELD(F_ARP_SHA,     "arp_sha",     FWW_ARP_SHA)        \
 546     FIELD(F_ARP_THA,     "arp_tha",     FWW_ARP_THA)        \
 547     FIELD(F_IPV6_SRC,    "ipv6_src",    0)                  \
 548     FIELD(F_IPV6_DST,    "ipv6_dst",    0)                  \
 549     FIELD(F_ND_TARGET,   "nd_target",   FWW_ND_TARGET)      \
 550     FIELD(F_ND_SLL,      "nd_sll",      FWW_ARP_SHA)        \
 551     FIELD(F_ND_TLL,      "nd_tll",      FWW_ARP_THA)
 552
 553 enum field_index {
 554 #define FIELD(ENUM, NAME, WILDCARD) ENUM,
 555     FIELDS
 556 #undef FIELD
 557     N_FIELDS
 558 };
 559
 560 struct field {
 561     enum field_index index;
 562     const char *name;
 563     flow_wildcards_t wildcard;  /* FWW_* bit. */
 564 };
 565
 566 static bool
 567 parse_field_name(const char *name, const struct field **f_out)
 568 {
 569     static const struct field fields[N_FIELDS] = {
 570 #define FIELD(ENUM, NAME, WILDCARD) { ENUM, NAME, WILDCARD },
 571         FIELDS
 572 #undef FIELD
 573     };
 574     const struct field *f;
 575
 576     for (f = fields; f < &fields[ARRAY_SIZE(fields)]; f++) {
 577         if (!strcmp(f->name, name)) {
 578             *f_out = f;
 579             return true;
 580         }
 581     }
 582     *f_out = NULL;
 583     return false;
 584 }
 585
 586 static void
 587 parse_field_value(struct cls_rule *rule, enum field_index index,
 588                   const char *value)
 589 {
 590     uint8_t mac[ETH_ADDR_LEN];
 591     ovs_be64 tun_id, tun_mask;
 592     ovs_be32 ip, mask;
 593     struct in6_addr ipv6, ipv6_mask;
 594     uint16_t port_no;
 595
 596     switch (index) {
 597     case F_TUN_ID:
 598         str_to_tun_id(value, &tun_id, &tun_mask);
 599         cls_rule_set_tun_id_masked(rule, tun_id, tun_mask);
 600         break;
 601
 602     case F_IN_PORT:
 603         if (!parse_port_name(value, &port_no)) {
 604             port_no = atoi(value);
 605         }
 606         if (port_no == OFPP_LOCAL) {
 607             port_no = ODPP_LOCAL;
 608         }
 609         cls_rule_set_in_port(rule, port_no);
 610         break;
 611
 612     case F_DL_VLAN:
 613         cls_rule_set_dl_vlan(rule, htons(str_to_u32(value)));
 614         break;
 615
 616     case F_DL_VLAN_PCP:
 617         cls_rule_set_dl_vlan_pcp(rule, str_to_u32(value));
 618         break;
 619
 620     case F_DL_SRC:
 621         str_to_mac(value, mac);
 622         cls_rule_set_dl_src(rule, mac);
 623         break;
 624
 625     case F_DL_DST:
 626         str_to_mac(value, mac);
 627         cls_rule_set_dl_dst(rule, mac);
 628         break;
 629
 630     case F_DL_TYPE:
 631         cls_rule_set_dl_type(rule, htons(str_to_u32(value)));
 632         break;
 633
 634     case F_NW_SRC:
 635         str_to_ip(value, &ip, &mask);
 636         cls_rule_set_nw_src_masked(rule, ip, mask);
 637         break;
 638
 639     case F_NW_DST:
 640         str_to_ip(value, &ip, &mask);
 641         cls_rule_set_nw_dst_masked(rule, ip, mask);
 642         break;
 643
 644     case F_NW_PROTO:
 645         cls_rule_set_nw_proto(rule, str_to_u32(value));
 646         break;
 647
 648     case F_NW_TOS:
 649         cls_rule_set_nw_tos(rule, str_to_u32(value));
 650         break;
 651
 652     case F_TP_SRC:
 653         cls_rule_set_tp_src(rule, htons(str_to_u32(value)));
 654         break;
 655
 656     case F_TP_DST:
 657         cls_rule_set_tp_dst(rule, htons(str_to_u32(value)));
 658         break;
 659
 660     case F_ICMP_TYPE:
 661         cls_rule_set_icmp_type(rule, str_to_u32(value));
 662         break;
 663
 664     case F_ICMP_CODE:
 665         cls_rule_set_icmp_code(rule, str_to_u32(value));
 666         break;
 667
 668     case F_ARP_SHA:
 669         str_to_mac(value, mac);
 670         cls_rule_set_arp_sha(rule, mac);
 671         break;
 672
 673     case F_ARP_THA:
 674         str_to_mac(value, mac);
 675         cls_rule_set_arp_tha(rule, mac);
 676         break;
 677
 678     case F_IPV6_SRC:
 679         str_to_ipv6(value, &ipv6, &ipv6_mask);
 680         cls_rule_set_ipv6_src_masked(rule, &ipv6, &ipv6_mask);
 681         break;
 682
 683     case F_IPV6_DST:
 684         str_to_ipv6(value, &ipv6, &ipv6_mask);
 685         cls_rule_set_ipv6_dst_masked(rule, &ipv6, &ipv6_mask);
 686         break;
 687
 688     case F_ND_TARGET:
 689         str_to_ipv6(value, &ipv6, NULL);
 690         cls_rule_set_nd_target(rule, ipv6);
 691         break;
 692
 693     case F_ND_SLL:
 694         str_to_mac(value, mac);
 695         cls_rule_set_arp_sha(rule, mac);
 696         break;
 697
 698     case F_ND_TLL:
 699         str_to_mac(value, mac);
 700         cls_rule_set_arp_tha(rule, mac);
 701         break;
 702
 703     case N_FIELDS:
 704         NOT_REACHED();
 705     }
 706 }
 707
 708 static void
 709 parse_reg_value(struct cls_rule *rule, int reg_idx, const char *value)
 710 {
 711     uint32_t reg_value, reg_mask;
 712
 713     if (!strcmp(value, "ANY") || !strcmp(value, "*")) {
 714         cls_rule_set_reg_masked(rule, reg_idx, 0, 0);
 715     } else if (sscanf(value, "%"SCNi32"/%"SCNi32,
 716                       &reg_value, &reg_mask) == 2) {
 717         cls_rule_set_reg_masked(rule, reg_idx, reg_value, reg_mask);
 718     } else if (sscanf(value, "%"SCNi32, &reg_value)) {
 719         cls_rule_set_reg(rule, reg_idx, reg_value);
 720     } else {
 721         ovs_fatal(0, "register fields must take the form <value> "
 722                   "or <value>/<mask>");
 723     }
 724 }
 725
 726 /* Convert 'string' (as described in the Flow Syntax section of the ovs-ofctl
 727  * man page) into 'pf'.  If 'actions' is specified, an action must be in
 728  * 'string' and may be expanded or reallocated. */
 729 void
 730 parse_ofp_str(struct flow_mod *fm, uint8_t *table_idx,
 731               struct ofpbuf *actions, char *string)
 732 {
 733     char *save_ptr = NULL;
 734     char *name;
 735
 736     if (table_idx) {
 737         *table_idx = 0xff;
 738     }
 739     cls_rule_init_catchall(&fm->cr, OFP_DEFAULT_PRIORITY);
 740     fm->cookie = htonll(0);
 741     fm->command = UINT16_MAX;
 742     fm->idle_timeout = OFP_FLOW_PERMANENT;
 743     fm->hard_timeout = OFP_FLOW_PERMANENT;
 744     fm->buffer_id = UINT32_MAX;
 745     fm->out_port = OFPP_NONE;
 746     fm->flags = 0;
 747     if (actions) {
 748         char *act_str = strstr(string, "action");
 749         if (!act_str) {
 750             ovs_fatal(0, "must specify an action");
 751         }
 752         *act_str = '\0';
 753
 754         act_str = strchr(act_str + 1, '=');
 755         if (!act_str) {
 756             ovs_fatal(0, "must specify an action");
 757         }
 758
 759         act_str++;
 760
 761         str_to_action(act_str, actions);
 762         fm->actions = actions->data;
 763         fm->n_actions = actions->size / sizeof(union ofp_action);
 764     } else {
 765         fm->actions = NULL;
 766         fm->n_actions = 0;
 767     }
 768     for (name = strtok_r(string, "=, \t\r\n", &save_ptr); name;
 769          name = strtok_r(NULL, "=, \t\r\n", &save_ptr)) {
 770         const struct protocol *p;
 771
 772         if (parse_protocol(name, &p)) {
 773             cls_rule_set_dl_type(&fm->cr, htons(p->dl_type));
 774             if (p->nw_proto) {
 775                 cls_rule_set_nw_proto(&fm->cr, p->nw_proto);
 776             }
 777         } else {
 778             const struct field *f;
 779             char *value;
 780
 781             value = strtok_r(NULL, ", \t\r\n", &save_ptr);
 782             if (!value) {
 783                 ovs_fatal(0, "field %s missing value", name);
 784             }
 785
 786             if (table_idx && !strcmp(name, "table")) {
 787                 *table_idx = atoi(value);
 788             } else if (!strcmp(name, "out_port")) {
 789                 fm->out_port = atoi(value);
 790             } else if (!strcmp(name, "priority")) {
 791                 fm->cr.priority = atoi(value);
 792             } else if (!strcmp(name, "idle_timeout")) {
 793                 fm->idle_timeout = atoi(value);
 794             } else if (!strcmp(name, "hard_timeout")) {
 795                 fm->hard_timeout = atoi(value);
 796             } else if (!strcmp(name, "cookie")) {
 797                 fm->cookie = htonll(str_to_u64(value));
 798             } else if (parse_field_name(name, &f)) {
 799                 if (!strcmp(value, "*") || !strcmp(value, "ANY")) {
 800                     if (f->wildcard) {
 801                         fm->cr.wc.wildcards |= f->wildcard;
 802                         cls_rule_zero_wildcarded_fields(&fm->cr);
 803                     } else if (f->index == F_NW_SRC) {
 804                         cls_rule_set_nw_src_masked(&fm->cr, 0, 0);
 805                     } else if (f->index == F_NW_DST) {
 806                         cls_rule_set_nw_dst_masked(&fm->cr, 0, 0);
 807                     } else if (f->index == F_IPV6_SRC) {
 808                         cls_rule_set_ipv6_src_masked(&fm->cr,
 809                                 &in6addr_any, &in6addr_any);
 810                     } else if (f->index == F_IPV6_DST) {
 811                         cls_rule_set_ipv6_dst_masked(&fm->cr,
 812                                 &in6addr_any, &in6addr_any);
 813                     } else if (f->index == F_DL_VLAN) {
 814                         cls_rule_set_any_vid(&fm->cr);
 815                     } else if (f->index == F_DL_VLAN_PCP) {
 816                         cls_rule_set_any_pcp(&fm->cr);
 817                     } else {
 818                         NOT_REACHED();
 819                     }
 820                 } else {
 821                     parse_field_value(&fm->cr, f->index, value);
 822                 }
 823             } else if (!strncmp(name, "reg", 3) && isdigit(name[3])) {
 824                 unsigned int reg_idx = atoi(name + 3);
 825                 if (reg_idx >= FLOW_N_REGS) {
 826                     ovs_fatal(0, "only %d registers supported", FLOW_N_REGS);
 827                 }
 828                 parse_reg_value(&fm->cr, reg_idx, value);
 829             } else {
 830                 ovs_fatal(0, "unknown keyword %s", name);
 831             }
 832         }
 833     }
 834 }
 835
 836 /* Parses 'string' as an OFPT_FLOW_MOD or NXT_FLOW_MOD with command 'command'
 837  * (one of OFPFC_*) and appends the parsed OpenFlow message to 'packets'.
 838  * '*cur_format' should initially contain the flow format currently configured
 839  * on the connection; this function will add a message to change the flow
 840  * format and update '*cur_format', if this is necessary to add the parsed
 841  * flow. */
 842 void
 843 parse_ofp_flow_mod_str(struct list *packets, enum nx_flow_format *cur_format,
 844                        char *string, uint16_t command)
 845 {
 846     bool is_del = command == OFPFC_DELETE || command == OFPFC_DELETE_STRICT;
 847     enum nx_flow_format min_format, next_format;
 848     struct ofpbuf actions;
 849     struct ofpbuf *ofm;
 850     struct flow_mod fm;
 851
 852     ofpbuf_init(&actions, 64);
 853     parse_ofp_str(&fm, NULL, is_del ? NULL : &actions, string);
 854     fm.command = command;
 855
 856     min_format = ofputil_min_flow_format(&fm.cr, true, fm.cookie);
 857     next_format = MAX(*cur_format, min_format);
 858     if (next_format != *cur_format) {
 859         struct ofpbuf *sff = ofputil_make_set_flow_format(next_format);
 860         list_push_back(packets, &sff->list_node);
 861         *cur_format = next_format;
 862     }
 863
 864     ofm = ofputil_encode_flow_mod(&fm, *cur_format);
 865     list_push_back(packets, &ofm->list_node);
 866
 867     ofpbuf_uninit(&actions);
 868 }
 869
 870 /* Similar to parse_ofp_flow_mod_str(), except that the string is read from
 871  * 'stream' and the command is always OFPFC_ADD.  Returns false if end-of-file
 872  * is reached before reading a flow, otherwise true. */
 873 bool
 874 parse_ofp_flow_mod_file(struct list *packets, enum nx_flow_format *cur,
 875                         FILE *stream, uint16_t command)
 876 {
 877     struct ds s;
 878     bool ok;
 879
 880     ds_init(&s);
 881     ok = ds_get_preprocessed_line(&s, stream) == 0;
 882     if (ok) {
 883         parse_ofp_flow_mod_str(packets, cur, ds_cstr(&s), command);
 884     }
 885     ds_destroy(&s);
 886
 887     return ok;
 888 }
 889
 890 void
 891 parse_ofp_flow_stats_request_str(struct flow_stats_request *fsr,
 892                                  bool aggregate, char *string)
 893 {
 894     struct flow_mod fm;
 895     uint8_t table_id;
 896
 897     parse_ofp_str(&fm, &table_id, NULL, string);
 898     fsr->aggregate = aggregate;
 899     fsr->match = fm.cr;
 900     fsr->out_port = fm.out_port;
 901     fsr->table_id = table_id;
 902 }