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 "autopath.h"
  26 #include "bundle.h"
  27 #include "byte-order.h"
  28 #include "dynamic-string.h"
  29 #include "netdev.h"
  30 #include "multipath.h"
  31 #include "nx-match.h"
  32 #include "ofp-util.h"
  33 #include "ofpbuf.h"
  34 #include "openflow/openflow.h"
  35 #include "packets.h"
  36 #include "socket-util.h"
  37 #include "vconn.h"
  38 #include "vlog.h"
  39
  40 VLOG_DEFINE_THIS_MODULE(ofp_parse);
  41
  42 static uint32_t
  43 str_to_u32(const char *str)
  44 {
  45     char *tail;
  46     uint32_t value;
  47
  48     if (!str[0]) {
  49         ovs_fatal(0, "missing required numeric argument");
  50     }
  51
  52     errno = 0;
  53     value = strtoul(str, &tail, 0);
  54     if (errno == EINVAL || errno == ERANGE || *tail) {
  55         ovs_fatal(0, "invalid numeric format %s", str);
  56     }
  57     return value;
  58 }
  59
  60 static uint64_t
  61 str_to_u64(const char *str)
  62 {
  63     char *tail;
  64     uint64_t value;
  65
  66     if (!str[0]) {
  67         ovs_fatal(0, "missing required numeric argument");
  68     }
  69
  70     errno = 0;
  71     value = strtoull(str, &tail, 0);
  72     if (errno == EINVAL || errno == ERANGE || *tail) {
  73         ovs_fatal(0, "invalid numeric format %s", str);
  74     }
  75     return value;
  76 }
  77
  78 static void
  79 str_to_mac(const char *str, uint8_t mac[6])
  80 {
  81     if (sscanf(str, ETH_ADDR_SCAN_FMT, ETH_ADDR_SCAN_ARGS(mac))
  82         != ETH_ADDR_SCAN_COUNT) {
  83         ovs_fatal(0, "invalid mac address %s", str);
  84     }
  85 }
  86
  87 static void
  88 str_to_eth_dst(const char *str,
  89                uint8_t mac[ETH_ADDR_LEN], uint8_t mask[ETH_ADDR_LEN])
  90 {
  91     if (sscanf(str, ETH_ADDR_SCAN_FMT"/"ETH_ADDR_SCAN_FMT,
  92                ETH_ADDR_SCAN_ARGS(mac), ETH_ADDR_SCAN_ARGS(mask))
  93         == ETH_ADDR_SCAN_COUNT * 2) {
  94         if (!flow_wildcards_is_dl_dst_mask_valid(mask)) {
  95             ovs_fatal(0, "%s: invalid Ethernet destination mask (only "
  96                       "00:00:00:00:00:00, 01:00:00:00:00:00, "
  97                       "fe:ff:ff:ff:ff:ff, and ff:ff:ff:ff:ff:ff are allowed)",
  98                       str);
  99         }
 100     } else if (sscanf(str, ETH_ADDR_SCAN_FMT, ETH_ADDR_SCAN_ARGS(mac))
 101                == ETH_ADDR_SCAN_COUNT) {
 102         memset(mask, 0xff, ETH_ADDR_LEN);
 103     } else {
 104         ovs_fatal(0, "invalid mac address %s", str);
 105     }
 106 }
 107
 108 static void
 109 str_to_ip(const char *str_, ovs_be32 *ip, ovs_be32 *maskp)
 110 {
 111     char *str = xstrdup(str_);
 112     char *save_ptr = NULL;
 113     const char *name, *netmask;
 114     struct in_addr in_addr;
 115     ovs_be32 mask;
 116     int retval;
 117
 118     name = strtok_r(str, "/", &save_ptr);
 119     retval = name ? lookup_ip(name, &in_addr) : EINVAL;
 120     if (retval) {
 121         ovs_fatal(0, "%s: could not convert to IP address", str);
 122     }
 123     *ip = in_addr.s_addr;
 124
 125     netmask = strtok_r(NULL, "/", &save_ptr);
 126     if (netmask) {
 127         uint8_t o[4];
 128         if (sscanf(netmask, "%"SCNu8".%"SCNu8".%"SCNu8".%"SCNu8,
 129                    &o[0], &o[1], &o[2], &o[3]) == 4) {
 130             mask = htonl((o[0] << 24) | (o[1] << 16) | (o[2] << 8) | o[3]);
 131         } else {
 132             int prefix = atoi(netmask);
 133             if (prefix <= 0 || prefix > 32) {
 134                 ovs_fatal(0, "%s: network prefix bits not between 1 and 32",
 135                           str);
 136             } else if (prefix == 32) {
 137                 mask = htonl(UINT32_MAX);
 138             } else {
 139                 mask = htonl(((1u << prefix) - 1) << (32 - prefix));
 140             }
 141         }
 142     } else {
 143         mask = htonl(UINT32_MAX);
 144     }
 145     *ip &= mask;
 146
 147     if (maskp) {
 148         *maskp = mask;
 149     } else {
 150         if (mask != htonl(UINT32_MAX)) {
 151             ovs_fatal(0, "%s: netmask not allowed here", str_);
 152         }
 153     }
 154
 155     free(str);
 156 }
 157
 158 static void
 159 str_to_tun_id(const char *str, ovs_be64 *tun_idp, ovs_be64 *maskp)
 160 {
 161     uint64_t tun_id, mask;
 162     char *tail;
 163
 164     errno = 0;
 165     tun_id = strtoull(str, &tail, 0);
 166     if (errno || (*tail != '\0' && *tail != '/')) {
 167         goto error;
 168     }
 169
 170     if (*tail == '/') {
 171         mask = strtoull(tail + 1, &tail, 0);
 172         if (errno || *tail != '\0') {
 173             goto error;
 174         }
 175     } else {
 176         mask = UINT64_MAX;
 177     }
 178
 179     *tun_idp = htonll(tun_id);
 180     *maskp = htonll(mask);
 181     return;
 182
 183 error:
 184     ovs_fatal(0, "%s: bad syntax for tunnel id", str);
 185 }
 186
 187 static void
 188 str_to_vlan_tci(const char *str, ovs_be16 *vlan_tcip, ovs_be16 *maskp)
 189 {
 190     uint16_t vlan_tci, mask;
 191     char *tail;
 192
 193     errno = 0;
 194     vlan_tci = strtol(str, &tail, 0);
 195     if (errno || (*tail != '\0' && *tail != '/')) {
 196         goto error;
 197     }
 198
 199     if (*tail == '/') {
 200         mask = strtol(tail + 1, &tail, 0);
 201         if (errno || *tail != '\0') {
 202             goto error;
 203         }
 204     } else {
 205         mask = UINT16_MAX;
 206     }
 207
 208     *vlan_tcip = htons(vlan_tci);
 209     *maskp = htons(mask);
 210     return;
 211
 212 error:
 213     ovs_fatal(0, "%s: bad syntax for vlan_tci", str);
 214 }
 215
 216 static void
 217 str_to_ipv6(const char *str_, struct in6_addr *addrp, struct in6_addr *maskp)
 218 {
 219     char *str = xstrdup(str_);
 220     char *save_ptr = NULL;
 221     const char *name, *netmask;
 222     struct in6_addr addr, mask;
 223     int retval;
 224
 225     name = strtok_r(str, "/", &save_ptr);
 226     retval = name ? lookup_ipv6(name, &addr) : EINVAL;
 227     if (retval) {
 228         ovs_fatal(0, "%s: could not convert to IPv6 address", str);
 229     }
 230
 231     netmask = strtok_r(NULL, "/", &save_ptr);
 232     if (netmask) {
 233         int prefix = atoi(netmask);
 234         if (prefix <= 0 || prefix > 128) {
 235             ovs_fatal(0, "%s: network prefix bits not between 1 and 128",
 236                       str);
 237         } else {
 238             mask = ipv6_create_mask(prefix);
 239         }
 240     } else {
 241         mask = in6addr_exact;
 242     }
 243     *addrp = ipv6_addr_bitand(&addr, &mask);
 244
 245     if (maskp) {
 246         *maskp = mask;
 247     } else {
 248         if (!ipv6_mask_is_exact(&mask)) {
 249             ovs_fatal(0, "%s: netmask not allowed here", str_);
 250         }
 251     }
 252
 253     free(str);
 254 }
 255
 256 static void *
 257 put_action(struct ofpbuf *b, size_t size, uint16_t type)
 258 {
 259     struct ofp_action_header *ah = ofpbuf_put_zeros(b, size);
 260     ah->type = htons(type);
 261     ah->len = htons(size);
 262     return ah;
 263 }
 264
 265 static struct ofp_action_output *
 266 put_output_action(struct ofpbuf *b, uint16_t port)
 267 {
 268     struct ofp_action_output *oao = put_action(b, sizeof *oao, OFPAT_OUTPUT);
 269     oao->port = htons(port);
 270     return oao;
 271 }
 272
 273 static void
 274 put_enqueue_action(struct ofpbuf *b, uint16_t port, uint32_t queue)
 275 {
 276     struct ofp_action_enqueue *oae = put_action(b, sizeof *oae, OFPAT_ENQUEUE);
 277     oae->port = htons(port);
 278     oae->queue_id = htonl(queue);
 279 }
 280
 281 static void
 282 put_dl_addr_action(struct ofpbuf *b, uint16_t type, const char *addr)
 283 {
 284     struct ofp_action_dl_addr *oada = put_action(b, sizeof *oada, type);
 285     str_to_mac(addr, oada->dl_addr);
 286 }
 287
 288
 289 static bool
 290 parse_port_name(const char *name, uint16_t *port)
 291 {
 292     struct pair {
 293         const char *name;
 294         uint16_t value;
 295     };
 296     static const struct pair pairs[] = {
 297 #define DEF_PAIR(NAME) {#NAME, OFPP_##NAME}
 298         DEF_PAIR(IN_PORT),
 299         DEF_PAIR(TABLE),
 300         DEF_PAIR(NORMAL),
 301         DEF_PAIR(FLOOD),
 302         DEF_PAIR(ALL),
 303         DEF_PAIR(CONTROLLER),
 304         DEF_PAIR(LOCAL),
 305         DEF_PAIR(NONE),
 306 #undef DEF_PAIR
 307     };
 308     static const int n_pairs = ARRAY_SIZE(pairs);
 309     size_t i;
 310
 311     for (i = 0; i < n_pairs; i++) {
 312         if (!strcasecmp(name, pairs[i].name)) {
 313             *port = pairs[i].value;
 314             return true;
 315         }
 316     }
 317     return false;
 318 }
 319
 320 static void
 321 str_to_action(char *str, struct ofpbuf *b)
 322 {
 323     bool drop = false;
 324     int n_actions;
 325     char *pos;
 326
 327     pos = str;
 328     n_actions = 0;
 329     for (;;) {
 330         char empty_string[] = "";
 331         char *act, *arg;
 332         size_t actlen;
 333         uint16_t port;
 334
 335         pos += strspn(pos, ", \t\r\n");
 336         if (*pos == '\0') {
 337             break;
 338         }
 339
 340         if (drop) {
 341             ovs_fatal(0, "Drop actions must not be followed by other actions");
 342         }
 343
 344         act = pos;
 345         actlen = strcspn(pos, ":(, \t\r\n");
 346         if (act[actlen] == ':') {
 347             /* The argument can be separated by a colon. */
 348             size_t arglen;
 349
 350             arg = act + actlen + 1;
 351             arglen = strcspn(arg, ", \t\r\n");
 352             pos = arg + arglen + (arg[arglen] != '\0');
 353             arg[arglen] = '\0';
 354         } else if (act[actlen] == '(') {
 355             /* The argument can be surrounded by balanced parentheses.  The
 356              * outermost set of parentheses is removed. */
 357             int level = 1;
 358             size_t arglen;
 359
 360             arg = act + actlen + 1;
 361             for (arglen = 0; level > 0; arglen++) {
 362                 switch (arg[arglen]) {
 363                 case '\0':
 364                     ovs_fatal(0, "unbalanced parentheses in argument to %s "
 365                               "action", act);
 366
 367                 case '(':
 368                     level++;
 369                     break;
 370
 371                 case ')':
 372                     level--;
 373                     break;
 374                 }
 375             }
 376             arg[arglen - 1] = '\0';
 377             pos = arg + arglen;
 378         } else {
 379             /* There might be no argument at all. */
 380             arg = empty_string;
 381             pos = act + actlen + (act[actlen] != '\0');
 382         }
 383         act[actlen] = '\0';
 384
 385         if (!strcasecmp(act, "mod_vlan_vid")) {
 386             struct ofp_action_vlan_vid *va;
 387             va = put_action(b, sizeof *va, OFPAT_SET_VLAN_VID);
 388             va->vlan_vid = htons(str_to_u32(arg));
 389         } else if (!strcasecmp(act, "mod_vlan_pcp")) {
 390             struct ofp_action_vlan_pcp *va;
 391             va = put_action(b, sizeof *va, OFPAT_SET_VLAN_PCP);
 392             va->vlan_pcp = str_to_u32(arg);
 393         } else if (!strcasecmp(act, "strip_vlan")) {
 394             struct ofp_action_header *ah;
 395             ah = put_action(b, sizeof *ah, OFPAT_STRIP_VLAN);
 396             ah->type = htons(OFPAT_STRIP_VLAN);
 397         } else if (!strcasecmp(act, "mod_dl_src")) {
 398             put_dl_addr_action(b, OFPAT_SET_DL_SRC, arg);
 399         } else if (!strcasecmp(act, "mod_dl_dst")) {
 400             put_dl_addr_action(b, OFPAT_SET_DL_DST, arg);
 401         } else if (!strcasecmp(act, "mod_nw_src")) {
 402             struct ofp_action_nw_addr *na;
 403             na = put_action(b, sizeof *na, OFPAT_SET_NW_SRC);
 404             str_to_ip(arg, &na->nw_addr, NULL);
 405         } else if (!strcasecmp(act, "mod_nw_dst")) {
 406             struct ofp_action_nw_addr *na;
 407             na = put_action(b, sizeof *na, OFPAT_SET_NW_DST);
 408             str_to_ip(arg, &na->nw_addr, NULL);
 409         } else if (!strcasecmp(act, "mod_tp_src")) {
 410             struct ofp_action_tp_port *ta;
 411             ta = put_action(b, sizeof *ta, OFPAT_SET_TP_SRC);
 412             ta->tp_port = htons(str_to_u32(arg));
 413         } else if (!strcasecmp(act, "mod_tp_dst")) {
 414             struct ofp_action_tp_port *ta;
 415             ta = put_action(b, sizeof *ta, OFPAT_SET_TP_DST);
 416             ta->tp_port = htons(str_to_u32(arg));
 417         } else if (!strcasecmp(act, "mod_nw_tos")) {
 418             struct ofp_action_nw_tos *nt;
 419             nt = put_action(b, sizeof *nt, OFPAT_SET_NW_TOS);
 420             nt->nw_tos = str_to_u32(arg);
 421         } else if (!strcasecmp(act, "resubmit")) {
 422             struct nx_action_resubmit *nar;
 423             nar = put_action(b, sizeof *nar, OFPAT_VENDOR);
 424             nar->vendor = htonl(NX_VENDOR_ID);
 425             nar->subtype = htons(NXAST_RESUBMIT);
 426             nar->in_port = htons(str_to_u32(arg));
 427         } else if (!strcasecmp(act, "set_tunnel")
 428                    || !strcasecmp(act, "set_tunnel64")) {
 429             uint64_t tun_id = str_to_u64(arg);
 430             if (!strcasecmp(act, "set_tunnel64") || tun_id > UINT32_MAX) {
 431                 struct nx_action_set_tunnel64 *nast64;
 432                 nast64 = put_action(b, sizeof *nast64, OFPAT_VENDOR);
 433                 nast64->vendor = htonl(NX_VENDOR_ID);
 434                 nast64->subtype = htons(NXAST_SET_TUNNEL64);
 435                 nast64->tun_id = htonll(tun_id);
 436             } else {
 437                 struct nx_action_set_tunnel *nast;
 438                 nast = put_action(b, sizeof *nast, OFPAT_VENDOR);
 439                 nast->vendor = htonl(NX_VENDOR_ID);
 440                 nast->subtype = htons(NXAST_SET_TUNNEL);
 441                 nast->tun_id = htonl(tun_id);
 442             }
 443         } else if (!strcasecmp(act, "set_queue")) {
 444             struct nx_action_set_queue *nasq;
 445             nasq = put_action(b, sizeof *nasq, OFPAT_VENDOR);
 446             nasq->vendor = htonl(NX_VENDOR_ID);
 447             nasq->subtype = htons(NXAST_SET_QUEUE);
 448             nasq->queue_id = htonl(str_to_u32(arg));
 449         } else if (!strcasecmp(act, "pop_queue")) {
 450             struct nx_action_header *nah;
 451             nah = put_action(b, sizeof *nah, OFPAT_VENDOR);
 452             nah->vendor = htonl(NX_VENDOR_ID);
 453             nah->subtype = htons(NXAST_POP_QUEUE);
 454         } else if (!strcasecmp(act, "note")) {
 455             size_t start_ofs = b->size;
 456             struct nx_action_note *nan;
 457             int remainder;
 458             size_t len;
 459
 460             nan = put_action(b, sizeof *nan, OFPAT_VENDOR);
 461             nan->vendor = htonl(NX_VENDOR_ID);
 462             nan->subtype = htons(NXAST_NOTE);
 463
 464             b->size -= sizeof nan->note;
 465             while (*arg != '\0') {
 466                 uint8_t byte;
 467                 bool ok;
 468
 469                 if (*arg == '.') {
 470                     arg++;
 471                 }
 472                 if (*arg == '\0') {
 473                     break;
 474                 }
 475
 476                 byte = hexits_value(arg, 2, &ok);
 477                 if (!ok) {
 478                     ovs_fatal(0, "bad hex digit in `note' argument");
 479                 }
 480                 ofpbuf_put(b, &byte, 1);
 481
 482                 arg += 2;
 483             }
 484
 485             len = b->size - start_ofs;
 486             remainder = len % OFP_ACTION_ALIGN;
 487             if (remainder) {
 488                 ofpbuf_put_zeros(b, OFP_ACTION_ALIGN - remainder);
 489             }
 490             nan = (struct nx_action_note *)((char *)b->data + start_ofs);
 491             nan->len = htons(b->size - start_ofs);
 492         } else if (!strcasecmp(act, "move")) {
 493             struct nx_action_reg_move *move;
 494             move = ofpbuf_put_uninit(b, sizeof *move);
 495             nxm_parse_reg_move(move, arg);
 496         } else if (!strcasecmp(act, "load")) {
 497             struct nx_action_reg_load *load;
 498             load = ofpbuf_put_uninit(b, sizeof *load);
 499             nxm_parse_reg_load(load, arg);
 500         } else if (!strcasecmp(act, "multipath")) {
 501             struct nx_action_multipath *nam;
 502             nam = ofpbuf_put_uninit(b, sizeof *nam);
 503             multipath_parse(nam, arg);
 504         } else if (!strcasecmp(act, "autopath")) {
 505             struct nx_action_autopath *naa;
 506             naa = ofpbuf_put_uninit(b, sizeof *naa);
 507             autopath_parse(naa, arg);
 508         } else if (!strcasecmp(act, "bundle")) {
 509             bundle_parse(b, arg);
 510         } else if (!strcasecmp(act, "bundle_load")) {
 511             bundle_parse_load(b, arg);
 512         } else if (!strcasecmp(act, "output")) {
 513             put_output_action(b, str_to_u32(arg));
 514         } else if (!strcasecmp(act, "enqueue")) {
 515             char *sp = NULL;
 516             char *port_s = strtok_r(arg, ":q", &sp);
 517             char *queue = strtok_r(NULL, "", &sp);
 518             if (port_s == NULL || queue == NULL) {
 519                 ovs_fatal(0, "\"enqueue\" syntax is \"enqueue:PORT:QUEUE\"");
 520             }
 521             put_enqueue_action(b, str_to_u32(port_s), str_to_u32(queue));
 522         } else if (!strcasecmp(act, "drop")) {
 523             /* A drop action in OpenFlow occurs by just not setting
 524              * an action. */
 525             drop = true;
 526             if (n_actions) {
 527                 ovs_fatal(0, "Drop actions must not be preceded by other "
 528                           "actions");
 529             }
 530         } else if (!strcasecmp(act, "CONTROLLER")) {
 531             struct ofp_action_output *oao;
 532             oao = put_output_action(b, OFPP_CONTROLLER);
 533
 534             /* Unless a numeric argument is specified, we send the whole
 535              * packet to the controller. */
 536             if (arg[0] && (strspn(arg, "0123456789") == strlen(arg))) {
 537                oao->max_len = htons(str_to_u32(arg));
 538             } else {
 539                 oao->max_len = htons(UINT16_MAX);
 540             }
 541         } else if (parse_port_name(act, &port)) {
 542             put_output_action(b, port);
 543         } else if (strspn(act, "0123456789") == strlen(act)) {
 544             put_output_action(b, str_to_u32(act));
 545         } else {
 546             ovs_fatal(0, "Unknown action: %s", act);
 547         }
 548         n_actions++;
 549     }
 550 }
 551
 552 struct protocol {
 553     const char *name;
 554     uint16_t dl_type;
 555     uint8_t nw_proto;
 556 };
 557
 558 static bool
 559 parse_protocol(const char *name, const struct protocol **p_out)
 560 {
 561     static const struct protocol protocols[] = {
 562         { "ip", ETH_TYPE_IP, 0 },
 563         { "arp", ETH_TYPE_ARP, 0 },
 564         { "icmp", ETH_TYPE_IP, IPPROTO_ICMP },
 565         { "tcp", ETH_TYPE_IP, IPPROTO_TCP },
 566         { "udp", ETH_TYPE_IP, IPPROTO_UDP },
 567         { "ipv6", ETH_TYPE_IPV6, 0 },
 568         { "ip6", ETH_TYPE_IPV6, 0 },
 569         { "icmp6", ETH_TYPE_IPV6, IPPROTO_ICMPV6 },
 570         { "tcp6", ETH_TYPE_IPV6, IPPROTO_TCP },
 571         { "udp6", ETH_TYPE_IPV6, IPPROTO_UDP },
 572     };
 573     const struct protocol *p;
 574
 575     for (p = protocols; p < &protocols[ARRAY_SIZE(protocols)]; p++) {
 576         if (!strcmp(p->name, name)) {
 577             *p_out = p;
 578             return true;
 579         }
 580     }
 581     *p_out = NULL;
 582     return false;
 583 }
 584
 585 #define FIELDS                                              \
 586     FIELD(F_TUN_ID,      "tun_id",      0)                  \
 587     FIELD(F_IN_PORT,     "in_port",     FWW_IN_PORT)        \
 588     FIELD(F_DL_VLAN,     "dl_vlan",     0)                  \
 589     FIELD(F_DL_VLAN_PCP, "dl_vlan_pcp", 0)                  \
 590     FIELD(F_VLAN_TCI,    "vlan_tci",    0)                  \
 591     FIELD(F_DL_SRC,      "dl_src",      FWW_DL_SRC)         \
 592     FIELD(F_DL_DST,      "dl_dst",      FWW_DL_DST | FWW_ETH_MCAST) \
 593     FIELD(F_DL_TYPE,     "dl_type",     FWW_DL_TYPE)        \
 594     FIELD(F_NW_SRC,      "nw_src",      0)                  \
 595     FIELD(F_NW_DST,      "nw_dst",      0)                  \
 596     FIELD(F_NW_PROTO,    "nw_proto",    FWW_NW_PROTO)       \
 597     FIELD(F_NW_TOS,      "nw_tos",      FWW_NW_TOS)         \
 598     FIELD(F_TP_SRC,      "tp_src",      FWW_TP_SRC)         \
 599     FIELD(F_TP_DST,      "tp_dst",      FWW_TP_DST)         \
 600     FIELD(F_ICMP_TYPE,   "icmp_type",   FWW_TP_SRC)         \
 601     FIELD(F_ICMP_CODE,   "icmp_code",   FWW_TP_DST)         \
 602     FIELD(F_ARP_SHA,     "arp_sha",     FWW_ARP_SHA)        \
 603     FIELD(F_ARP_THA,     "arp_tha",     FWW_ARP_THA)        \
 604     FIELD(F_IPV6_SRC,    "ipv6_src",    0)                  \
 605     FIELD(F_IPV6_DST,    "ipv6_dst",    0)                  \
 606     FIELD(F_ND_TARGET,   "nd_target",   FWW_ND_TARGET)      \
 607     FIELD(F_ND_SLL,      "nd_sll",      FWW_ARP_SHA)        \
 608     FIELD(F_ND_TLL,      "nd_tll",      FWW_ARP_THA)
 609
 610 enum field_index {
 611 #define FIELD(ENUM, NAME, WILDCARD) ENUM,
 612     FIELDS
 613 #undef FIELD
 614     N_FIELDS
 615 };
 616
 617 struct field {
 618     enum field_index index;
 619     const char *name;
 620     flow_wildcards_t wildcard;  /* FWW_* bit. */
 621 };
 622
 623 static void
 624 ofp_fatal(const char *flow, bool verbose, const char *format, ...)
 625 {
 626     va_list args;
 627
 628     if (verbose) {
 629         fprintf(stderr, "%s:\n", flow);
 630     }
 631
 632     va_start(args, format);
 633     ovs_fatal_valist(0, format, args);
 634 }
 635
 636 static bool
 637 parse_field_name(const char *name, const struct field **f_out)
 638 {
 639     static const struct field fields[N_FIELDS] = {
 640 #define FIELD(ENUM, NAME, WILDCARD) { ENUM, NAME, WILDCARD },
 641         FIELDS
 642 #undef FIELD
 643     };
 644     const struct field *f;
 645
 646     for (f = fields; f < &fields[ARRAY_SIZE(fields)]; f++) {
 647         if (!strcmp(f->name, name)) {
 648             *f_out = f;
 649             return true;
 650         }
 651     }
 652     *f_out = NULL;
 653     return false;
 654 }
 655
 656 static void
 657 parse_field_value(struct cls_rule *rule, enum field_index index,
 658                   const char *value)
 659 {
 660     uint8_t mac[ETH_ADDR_LEN], mac_mask[ETH_ADDR_LEN];
 661     ovs_be64 tun_id, tun_mask;
 662     ovs_be32 ip, mask;
 663     ovs_be16 tci, tci_mask;
 664     struct in6_addr ipv6, ipv6_mask;
 665     uint16_t port_no;
 666
 667     switch (index) {
 668     case F_TUN_ID:
 669         str_to_tun_id(value, &tun_id, &tun_mask);
 670         cls_rule_set_tun_id_masked(rule, tun_id, tun_mask);
 671         break;
 672
 673     case F_IN_PORT:
 674         if (!parse_port_name(value, &port_no)) {
 675             port_no = atoi(value);
 676         }
 677         cls_rule_set_in_port(rule, port_no);
 678         break;
 679
 680     case F_DL_VLAN:
 681         cls_rule_set_dl_vlan(rule, htons(str_to_u32(value)));
 682         break;
 683
 684     case F_DL_VLAN_PCP:
 685         cls_rule_set_dl_vlan_pcp(rule, str_to_u32(value));
 686         break;
 687
 688     case F_VLAN_TCI:
 689         str_to_vlan_tci(value, &tci, &tci_mask);
 690         cls_rule_set_dl_tci_masked(rule, tci, tci_mask);
 691         break;
 692
 693     case F_DL_SRC:
 694         str_to_mac(value, mac);
 695         cls_rule_set_dl_src(rule, mac);
 696         break;
 697
 698     case F_DL_DST:
 699         str_to_eth_dst(value, mac, mac_mask);
 700         cls_rule_set_dl_dst_masked(rule, mac, mac_mask);
 701         break;
 702
 703     case F_DL_TYPE:
 704         cls_rule_set_dl_type(rule, htons(str_to_u32(value)));
 705         break;
 706
 707     case F_NW_SRC:
 708         str_to_ip(value, &ip, &mask);
 709         cls_rule_set_nw_src_masked(rule, ip, mask);
 710         break;
 711
 712     case F_NW_DST:
 713         str_to_ip(value, &ip, &mask);
 714         cls_rule_set_nw_dst_masked(rule, ip, mask);
 715         break;
 716
 717     case F_NW_PROTO:
 718         cls_rule_set_nw_proto(rule, str_to_u32(value));
 719         break;
 720
 721     case F_NW_TOS:
 722         cls_rule_set_nw_tos(rule, str_to_u32(value));
 723         break;
 724
 725     case F_TP_SRC:
 726         cls_rule_set_tp_src(rule, htons(str_to_u32(value)));
 727         break;
 728
 729     case F_TP_DST:
 730         cls_rule_set_tp_dst(rule, htons(str_to_u32(value)));
 731         break;
 732
 733     case F_ICMP_TYPE:
 734         cls_rule_set_icmp_type(rule, str_to_u32(value));
 735         break;
 736
 737     case F_ICMP_CODE:
 738         cls_rule_set_icmp_code(rule, str_to_u32(value));
 739         break;
 740
 741     case F_ARP_SHA:
 742         str_to_mac(value, mac);
 743         cls_rule_set_arp_sha(rule, mac);
 744         break;
 745
 746     case F_ARP_THA:
 747         str_to_mac(value, mac);
 748         cls_rule_set_arp_tha(rule, mac);
 749         break;
 750
 751     case F_IPV6_SRC:
 752         str_to_ipv6(value, &ipv6, &ipv6_mask);
 753         cls_rule_set_ipv6_src_masked(rule, &ipv6, &ipv6_mask);
 754         break;
 755
 756     case F_IPV6_DST:
 757         str_to_ipv6(value, &ipv6, &ipv6_mask);
 758         cls_rule_set_ipv6_dst_masked(rule, &ipv6, &ipv6_mask);
 759         break;
 760
 761     case F_ND_TARGET:
 762         str_to_ipv6(value, &ipv6, NULL);
 763         cls_rule_set_nd_target(rule, ipv6);
 764         break;
 765
 766     case F_ND_SLL:
 767         str_to_mac(value, mac);
 768         cls_rule_set_arp_sha(rule, mac);
 769         break;
 770
 771     case F_ND_TLL:
 772         str_to_mac(value, mac);
 773         cls_rule_set_arp_tha(rule, mac);
 774         break;
 775
 776     case N_FIELDS:
 777         NOT_REACHED();
 778     }
 779 }
 780
 781 static void
 782 parse_reg_value(struct cls_rule *rule, int reg_idx, const char *value)
 783 {
 784     uint32_t reg_value, reg_mask;
 785
 786     if (!strcmp(value, "ANY") || !strcmp(value, "*")) {
 787         cls_rule_set_reg_masked(rule, reg_idx, 0, 0);
 788     } else if (sscanf(value, "%"SCNi32"/%"SCNi32,
 789                       &reg_value, &reg_mask) == 2) {
 790         cls_rule_set_reg_masked(rule, reg_idx, reg_value, reg_mask);
 791     } else if (sscanf(value, "%"SCNi32, &reg_value)) {
 792         cls_rule_set_reg(rule, reg_idx, reg_value);
 793     } else {
 794         ovs_fatal(0, "register fields must take the form <value> "
 795                   "or <value>/<mask>");
 796     }
 797 }
 798
 799 /* Convert 'str_' (as described in the Flow Syntax section of the ovs-ofctl man
 800  * page) into 'fm' for sending the specified flow_mod 'command' to a switch.
 801  * If 'actions' is specified, an action must be in 'string' and may be expanded
 802  * or reallocated.
 803  *
 804  * To parse syntax for an OFPT_FLOW_MOD (or NXT_FLOW_MOD), use an OFPFC_*
 805  * constant for 'command'.  To parse syntax for an OFPST_FLOW or
 806  * OFPST_AGGREGATE (or NXST_FLOW or NXST_AGGREGATE), use -1 for 'command'. */
 807 void
 808 parse_ofp_str(struct flow_mod *fm, int command, const char *str_, bool verbose)
 809 {
 810     enum {
 811         F_OUT_PORT = 1 << 0,
 812         F_ACTIONS = 1 << 1,
 813         F_COOKIE = 1 << 2,
 814         F_TIMEOUT = 1 << 3,
 815         F_PRIORITY = 1 << 4
 816     } fields;
 817     char *string = xstrdup(str_);
 818     char *save_ptr = NULL;
 819     char *name;
 820
 821     switch (command) {
 822     case -1:
 823         fields = F_OUT_PORT;
 824         break;
 825
 826     case OFPFC_ADD:
 827         fields = F_ACTIONS | F_COOKIE | F_TIMEOUT | F_PRIORITY;
 828         break;
 829
 830     case OFPFC_DELETE:
 831         fields = F_OUT_PORT;
 832         break;
 833
 834     case OFPFC_DELETE_STRICT:
 835         fields = F_OUT_PORT | F_PRIORITY;
 836         break;
 837
 838     case OFPFC_MODIFY:
 839         fields = F_ACTIONS | F_COOKIE;
 840         break;
 841
 842     case OFPFC_MODIFY_STRICT:
 843         fields = F_ACTIONS | F_COOKIE | F_PRIORITY;
 844         break;
 845
 846     default:
 847         NOT_REACHED();
 848     }
 849
 850     cls_rule_init_catchall(&fm->cr, OFP_DEFAULT_PRIORITY);
 851     fm->cookie = htonll(0);
 852     fm->table_id = 0xff;
 853     fm->command = command;
 854     fm->idle_timeout = OFP_FLOW_PERMANENT;
 855     fm->hard_timeout = OFP_FLOW_PERMANENT;
 856     fm->buffer_id = UINT32_MAX;
 857     fm->out_port = OFPP_NONE;
 858     fm->flags = 0;
 859     if (fields & F_ACTIONS) {
 860         struct ofpbuf actions;
 861         char *act_str;
 862
 863         act_str = strstr(string, "action");
 864         if (!act_str) {
 865             ofp_fatal(str_, verbose, "must specify an action");
 866         }
 867         *act_str = '\0';
 868
 869         act_str = strchr(act_str + 1, '=');
 870         if (!act_str) {
 871             ofp_fatal(str_, verbose, "must specify an action");
 872         }
 873
 874         act_str++;
 875
 876         ofpbuf_init(&actions, sizeof(union ofp_action));
 877         str_to_action(act_str, &actions);
 878         fm->actions = ofpbuf_steal_data(&actions);
 879         fm->n_actions = actions.size / sizeof(union ofp_action);
 880     } else {
 881         fm->actions = NULL;
 882         fm->n_actions = 0;
 883     }
 884     for (name = strtok_r(string, "=, \t\r\n", &save_ptr); name;
 885          name = strtok_r(NULL, "=, \t\r\n", &save_ptr)) {
 886         const struct protocol *p;
 887
 888         if (parse_protocol(name, &p)) {
 889             cls_rule_set_dl_type(&fm->cr, htons(p->dl_type));
 890             if (p->nw_proto) {
 891                 cls_rule_set_nw_proto(&fm->cr, p->nw_proto);
 892             }
 893         } else {
 894             const struct field *f;
 895             char *value;
 896
 897             value = strtok_r(NULL, ", \t\r\n", &save_ptr);
 898             if (!value) {
 899                 ofp_fatal(str_, verbose, "field %s missing value", name);
 900             }
 901
 902             if (!strcmp(name, "table")) {
 903                 fm->table_id = atoi(value);
 904             } else if (!strcmp(name, "out_port")) {
 905                 fm->out_port = atoi(value);
 906             } else if (fields & F_PRIORITY && !strcmp(name, "priority")) {
 907                 fm->cr.priority = atoi(value);
 908             } else if (fields & F_TIMEOUT && !strcmp(name, "idle_timeout")) {
 909                 fm->idle_timeout = atoi(value);
 910             } else if (fields & F_TIMEOUT && !strcmp(name, "hard_timeout")) {
 911                 fm->hard_timeout = atoi(value);
 912             } else if (fields & F_COOKIE && !strcmp(name, "cookie")) {
 913                 fm->cookie = htonll(str_to_u64(value));
 914             } else if (parse_field_name(name, &f)) {
 915                 if (!strcmp(value, "*") || !strcmp(value, "ANY")) {
 916                     if (f->wildcard) {
 917                         fm->cr.wc.wildcards |= f->wildcard;
 918                         cls_rule_zero_wildcarded_fields(&fm->cr);
 919                     } else if (f->index == F_NW_SRC) {
 920                         cls_rule_set_nw_src_masked(&fm->cr, 0, 0);
 921                     } else if (f->index == F_NW_DST) {
 922                         cls_rule_set_nw_dst_masked(&fm->cr, 0, 0);
 923                     } else if (f->index == F_IPV6_SRC) {
 924                         cls_rule_set_ipv6_src_masked(&fm->cr,
 925                                 &in6addr_any, &in6addr_any);
 926                     } else if (f->index == F_IPV6_DST) {
 927                         cls_rule_set_ipv6_dst_masked(&fm->cr,
 928                                 &in6addr_any, &in6addr_any);
 929                     } else if (f->index == F_DL_VLAN) {
 930                         cls_rule_set_any_vid(&fm->cr);
 931                     } else if (f->index == F_DL_VLAN_PCP) {
 932                         cls_rule_set_any_pcp(&fm->cr);
 933                     } else {
 934                         NOT_REACHED();
 935                     }
 936                 } else {
 937                     parse_field_value(&fm->cr, f->index, value);
 938                 }
 939             } else if (!strncmp(name, "reg", 3)
 940                        && isdigit((unsigned char) name[3])) {
 941                 unsigned int reg_idx = atoi(name + 3);
 942                 if (reg_idx >= FLOW_N_REGS) {
 943                     if (verbose) {
 944                         fprintf(stderr, "%s:\n", str_);
 945                     }
 946                     ofp_fatal(str_, verbose, "only %d registers supported", FLOW_N_REGS);
 947                 }
 948                 parse_reg_value(&fm->cr, reg_idx, value);
 949             } else if (!strcmp(name, "duration")
 950                        || !strcmp(name, "n_packets")
 951                        || !strcmp(name, "n_bytes")) {
 952                 /* Ignore these, so that users can feed the output of
 953                  * "ovs-ofctl dump-flows" back into commands that parse
 954                  * flows. */
 955             } else {
 956                 ofp_fatal(str_, verbose, "unknown keyword %s", name);
 957             }
 958         }
 959     }
 960
 961     free(string);
 962 }
 963
 964 /* Parses 'string' as an OFPT_FLOW_MOD or NXT_FLOW_MOD with command 'command'
 965  * (one of OFPFC_*) and appends the parsed OpenFlow message to 'packets'.
 966  * '*cur_format' should initially contain the flow format currently configured
 967  * on the connection; this function will add a message to change the flow
 968  * format and update '*cur_format', if this is necessary to add the parsed
 969  * flow. */
 970 void
 971 parse_ofp_flow_mod_str(struct list *packets, enum nx_flow_format *cur_format,
 972                        bool *flow_mod_table_id, char *string, uint16_t command,
 973                        bool verbose)
 974 {
 975     enum nx_flow_format min_format, next_format;
 976     struct cls_rule rule_copy;
 977     struct ofpbuf actions;
 978     struct ofpbuf *ofm;
 979     struct flow_mod fm;
 980
 981     ofpbuf_init(&actions, 64);
 982     parse_ofp_str(&fm, command, string, verbose);
 983
 984     min_format = ofputil_min_flow_format(&fm.cr);
 985     next_format = MAX(*cur_format, min_format);
 986     if (next_format != *cur_format) {
 987         struct ofpbuf *sff = ofputil_make_set_flow_format(next_format);
 988         list_push_back(packets, &sff->list_node);
 989         *cur_format = next_format;
 990     }
 991
 992     /* Normalize a copy of the rule.  This ensures that non-normalized flows
 993      * get logged but doesn't affect what gets sent to the switch, so that the
 994      * switch can do whatever it likes with the flow. */
 995     rule_copy = fm.cr;
 996     ofputil_normalize_rule(&rule_copy, next_format);
 997
 998     if (fm.table_id != 0xff && !*flow_mod_table_id) {
 999         struct ofpbuf *sff = ofputil_make_flow_mod_table_id(true);
1000         list_push_back(packets, &sff->list_node);
1001         *flow_mod_table_id = true;
1002     }
1003
1004     ofm = ofputil_encode_flow_mod(&fm, *cur_format, *flow_mod_table_id);
1005     list_push_back(packets, &ofm->list_node);
1006
1007     ofpbuf_uninit(&actions);
1008 }
1009
1010 /* Similar to parse_ofp_flow_mod_str(), except that the string is read from
1011  * 'stream' and the command is always OFPFC_ADD.  Returns false if end-of-file
1012  * is reached before reading a flow, otherwise true. */
1013 bool
1014 parse_ofp_flow_mod_file(struct list *packets,
1015                         enum nx_flow_format *cur, bool *flow_mod_table_id,
1016                         FILE *stream, uint16_t command)
1017 {
1018     struct ds s;
1019     bool ok;
1020
1021     ds_init(&s);
1022     ok = ds_get_preprocessed_line(&s, stream) == 0;
1023     if (ok) {
1024         parse_ofp_flow_mod_str(packets, cur, flow_mod_table_id,
1025                                ds_cstr(&s), command, true);
1026     }
1027     ds_destroy(&s);
1028
1029     return ok;
1030 }
1031
1032 void
1033 parse_ofp_flow_stats_request_str(struct flow_stats_request *fsr,
1034                                  bool aggregate, char *string)
1035 {
1036     struct flow_mod fm;
1037
1038     parse_ofp_str(&fm, -1, string, false);
1039     fsr->aggregate = aggregate;
1040     fsr->match = fm.cr;
1041     fsr->out_port = fm.out_port;
1042     fsr->table_id = fm.table_id;
1043 }