lib/netdev-dummy.c

   1 /*
   2  * Copyright (c) 2010, 2011, 2012, 2013 Nicira, Inc.
   3  *
   4  * Licensed under the Apache License, Version 2.0 (the "License");
   5  * you may not use this file except in compliance with the License.
   6  * You may obtain a copy of the License at:
   7  *
   8  *     http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  * Unless required by applicable law or agreed to in writing, software
  11  * distributed under the License is distributed on an "AS IS" BASIS,
  12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  * See the License for the specific language governing permissions and
  14  * limitations under the License.
  15  */
  16
  17 #include <config.h>
  18
  19 #include "dummy.h"
  20
  21 #include <errno.h>
  22
  23 #include "flow.h"
  24 #include "list.h"
  25 #include "netdev-provider.h"
  26 #include "netdev-vport.h"
  27 #include "odp-util.h"
  28 #include "ofp-print.h"
  29 #include "ofpbuf.h"
  30 #include "packets.h"
  31 #include "poll-loop.h"
  32 #include "shash.h"
  33 #include "sset.h"
  34 #include "stream.h"
  35 #include "unaligned.h"
  36 #include "unixctl.h"
  37 #include "vlog.h"
  38
  39 VLOG_DEFINE_THIS_MODULE(netdev_dummy);
  40
  41 struct dummy_stream {
  42     struct stream *stream;
  43     struct ofpbuf rxbuf;
  44     struct list txq;
  45 };
  46
  47 struct netdev_dummy {
  48     struct netdev up;
  49     uint8_t hwaddr[ETH_ADDR_LEN];
  50     int mtu;
  51     struct netdev_stats stats;
  52     enum netdev_flags flags;
  53     unsigned int change_seq;
  54     int ifindex;
  55
  56     struct pstream *pstream;
  57     struct dummy_stream *streams;
  58     size_t n_streams;
  59
  60     struct list rxes;           /* List of child "netdev_rx_dummy"s. */
  61 };
  62
  63 /* Max 'recv_queue_len' in struct netdev_dummy. */
  64 #define NETDEV_DUMMY_MAX_QUEUE 100
  65
  66 struct netdev_rx_dummy {
  67     struct netdev_rx up;
  68     struct list node;           /* In netdev_dummy's "rxes" list. */
  69     struct list recv_queue;
  70     int recv_queue_len;         /* list_size(&recv_queue). */
  71     bool listening;
  72 };
  73
  74 static struct shash dummy_netdevs = SHASH_INITIALIZER(&dummy_netdevs);
  75
  76 static const struct netdev_rx_class netdev_rx_dummy_class;
  77
  78 static unixctl_cb_func netdev_dummy_set_admin_state;
  79 static int netdev_dummy_create(const struct netdev_class *, const char *,
  80                                struct netdev **);
  81 static void netdev_dummy_poll_notify(struct netdev_dummy *);
  82 static void netdev_dummy_queue_packet(struct netdev_dummy *, struct ofpbuf *);
  83
  84 static void dummy_stream_close(struct dummy_stream *);
  85
  86 static bool
  87 is_dummy_class(const struct netdev_class *class)
  88 {
  89     return class->create == netdev_dummy_create;
  90 }
  91
  92 static struct netdev_dummy *
  93 netdev_dummy_cast(const struct netdev *netdev)
  94 {
  95     ovs_assert(is_dummy_class(netdev_get_class(netdev)));
  96     return CONTAINER_OF(netdev, struct netdev_dummy, up);
  97 }
  98
  99 static struct netdev_rx_dummy *
 100 netdev_rx_dummy_cast(const struct netdev_rx *rx)
 101 {
 102     netdev_rx_assert_class(rx, &netdev_rx_dummy_class);
 103     return CONTAINER_OF(rx, struct netdev_rx_dummy, up);
 104 }
 105
 106 static void
 107 netdev_dummy_run(void)
 108 {
 109     struct shash_node *node;
 110
 111     SHASH_FOR_EACH (node, &dummy_netdevs) {
 112         struct netdev_dummy *dev = node->data;
 113         size_t i;
 114
 115         if (dev->pstream) {
 116             struct stream *new_stream;
 117             int error;
 118
 119             error = pstream_accept(dev->pstream, &new_stream);
 120             if (!error) {
 121                 struct dummy_stream *s;
 122
 123                 dev->streams = xrealloc(dev->streams,
 124                                         ((dev->n_streams + 1)
 125                                          * sizeof *dev->streams));
 126                 s = &dev->streams[dev->n_streams++];
 127                 s->stream = new_stream;
 128                 ofpbuf_init(&s->rxbuf, 2048);
 129                 list_init(&s->txq);
 130             } else if (error != EAGAIN) {
 131                 VLOG_WARN("%s: accept failed (%s)",
 132                           pstream_get_name(dev->pstream), ovs_strerror(error));
 133                 pstream_close(dev->pstream);
 134                 dev->pstream = NULL;
 135             }
 136         }
 137
 138         for (i = 0; i < dev->n_streams; i++) {
 139             struct dummy_stream *s = &dev->streams[i];
 140             int error = 0;
 141             size_t n;
 142
 143             stream_run(s->stream);
 144
 145             if (!list_is_empty(&s->txq)) {
 146                 struct ofpbuf *txbuf;
 147                 int retval;
 148
 149                 txbuf = ofpbuf_from_list(list_front(&s->txq));
 150                 retval = stream_send(s->stream, txbuf->data, txbuf->size);
 151                 if (retval > 0) {
 152                     ofpbuf_pull(txbuf, retval);
 153                     if (!txbuf->size) {
 154                         list_remove(&txbuf->list_node);
 155                         ofpbuf_delete(txbuf);
 156                     }
 157                 } else if (retval != -EAGAIN) {
 158                     error = -retval;
 159                 }
 160             }
 161
 162             if (!error) {
 163                 if (s->rxbuf.size < 2) {
 164                     n = 2 - s->rxbuf.size;
 165                 } else {
 166                     uint16_t frame_len;
 167
 168                     frame_len = ntohs(get_unaligned_be16(s->rxbuf.data));
 169                     if (frame_len < ETH_HEADER_LEN) {
 170                         error = EPROTO;
 171                         n = 0;
 172                     } else {
 173                         n = (2 + frame_len) - s->rxbuf.size;
 174                     }
 175                 }
 176             }
 177             if (!error) {
 178                 int retval;
 179
 180                 ofpbuf_prealloc_tailroom(&s->rxbuf, n);
 181                 retval = stream_recv(s->stream, ofpbuf_tail(&s->rxbuf), n);
 182                 if (retval > 0) {
 183                     s->rxbuf.size += retval;
 184                     if (retval == n && s->rxbuf.size > 2) {
 185                         ofpbuf_pull(&s->rxbuf, 2);
 186                         netdev_dummy_queue_packet(dev,
 187                                                   ofpbuf_clone(&s->rxbuf));
 188                         ofpbuf_clear(&s->rxbuf);
 189                     }
 190                 } else if (retval != -EAGAIN) {
 191                     error = (retval < 0 ? -retval
 192                              : s->rxbuf.size ? EPROTO
 193                              : EOF);
 194                 }
 195             }
 196
 197             if (error) {
 198                 VLOG_DBG("%s: closing connection (%s)",
 199                          stream_get_name(s->stream),
 200                          ovs_retval_to_string(error));
 201                 dummy_stream_close(&dev->streams[i]);
 202                 dev->streams[i] = dev->streams[--dev->n_streams];
 203             }
 204         }
 205     }
 206 }
 207
 208 static void
 209 dummy_stream_close(struct dummy_stream *s)
 210 {
 211     stream_close(s->stream);
 212     ofpbuf_uninit(&s->rxbuf);
 213     ofpbuf_list_delete(&s->txq);
 214 }
 215
 216 static void
 217 netdev_dummy_wait(void)
 218 {
 219     struct shash_node *node;
 220
 221     SHASH_FOR_EACH (node, &dummy_netdevs) {
 222         struct netdev_dummy *dev = node->data;
 223         size_t i;
 224
 225         if (dev->pstream) {
 226             pstream_wait(dev->pstream);
 227         }
 228         for (i = 0; i < dev->n_streams; i++) {
 229             struct dummy_stream *s = &dev->streams[i];
 230
 231             stream_run_wait(s->stream);
 232             if (!list_is_empty(&s->txq)) {
 233                 stream_send_wait(s->stream);
 234             }
 235             stream_recv_wait(s->stream);
 236         }
 237     }
 238 }
 239
 240 static int
 241 netdev_dummy_create(const struct netdev_class *class, const char *name,
 242                     struct netdev **netdevp)
 243 {
 244     static atomic_uint next_n = ATOMIC_VAR_INIT(0xaa550000);
 245     struct netdev_dummy *netdev;
 246     unsigned int n;
 247
 248     atomic_add(&next_n, 1, &n);
 249     netdev = xzalloc(sizeof *netdev);
 250     netdev_init(&netdev->up, name, class);
 251     netdev->hwaddr[0] = 0xaa;
 252     netdev->hwaddr[1] = 0x55;
 253     netdev->hwaddr[2] = n >> 24;
 254     netdev->hwaddr[3] = n >> 16;
 255     netdev->hwaddr[4] = n >> 8;
 256     netdev->hwaddr[5] = n;
 257     netdev->mtu = 1500;
 258     netdev->flags = 0;
 259     netdev->change_seq = 1;
 260     netdev->ifindex = -EOPNOTSUPP;
 261
 262     netdev->pstream = NULL;
 263     netdev->streams = NULL;
 264     netdev->n_streams = 0;
 265
 266     list_init(&netdev->rxes);
 267
 268     shash_add(&dummy_netdevs, name, netdev);
 269
 270     *netdevp = &netdev->up;
 271
 272     return 0;
 273 }
 274
 275 static void
 276 netdev_dummy_destroy(struct netdev *netdev_)
 277 {
 278     struct netdev_dummy *netdev = netdev_dummy_cast(netdev_);
 279     size_t i;
 280
 281     shash_find_and_delete(&dummy_netdevs,
 282                           netdev_get_name(netdev_));
 283     pstream_close(netdev->pstream);
 284     for (i = 0; i < netdev->n_streams; i++) {
 285         dummy_stream_close(&netdev->streams[i]);
 286     }
 287     free(netdev->streams);
 288     free(netdev);
 289 }
 290
 291 static int
 292 netdev_dummy_get_config(const struct netdev *netdev_, struct smap *args)
 293 {
 294     struct netdev_dummy *netdev = netdev_dummy_cast(netdev_);
 295
 296     if (netdev->ifindex >= 0) {
 297         smap_add_format(args, "ifindex", "%d", netdev->ifindex);
 298     }
 299     if (netdev->pstream) {
 300         smap_add(args, "pstream", pstream_get_name(netdev->pstream));
 301     }
 302     return 0;
 303 }
 304
 305 static int
 306 netdev_dummy_set_config(struct netdev *netdev_, const struct smap *args)
 307 {
 308     struct netdev_dummy *netdev = netdev_dummy_cast(netdev_);
 309     const char *pstream;
 310
 311     netdev->ifindex = smap_get_int(args, "ifindex", -EOPNOTSUPP);
 312
 313     pstream = smap_get(args, "pstream");
 314     if (!pstream
 315         || !netdev->pstream
 316         || strcmp(pstream_get_name(netdev->pstream), pstream)) {
 317         pstream_close(netdev->pstream);
 318         netdev->pstream = NULL;
 319
 320         if (pstream) {
 321             int error;
 322
 323             error = pstream_open(pstream, &netdev->pstream, DSCP_DEFAULT);
 324             if (error) {
 325                 VLOG_WARN("%s: open failed (%s)",
 326                           pstream, ovs_strerror(error));
 327             }
 328         }
 329     }
 330     return 0;
 331 }
 332
 333 static int
 334 netdev_dummy_rx_open(struct netdev *netdev_, struct netdev_rx **rxp)
 335 {
 336     struct netdev_dummy *netdev = netdev_dummy_cast(netdev_);
 337     struct netdev_rx_dummy *rx;
 338
 339     rx = xmalloc(sizeof *rx);
 340     netdev_rx_init(&rx->up, &netdev->up, &netdev_rx_dummy_class);
 341     list_push_back(&netdev->rxes, &rx->node);
 342     list_init(&rx->recv_queue);
 343     rx->recv_queue_len = 0;
 344
 345     *rxp = &rx->up;
 346     return 0;
 347 }
 348
 349 static int
 350 netdev_rx_dummy_recv(struct netdev_rx *rx_, void *buffer, size_t size)
 351 {
 352     struct netdev_rx_dummy *rx = netdev_rx_dummy_cast(rx_);
 353     struct ofpbuf *packet;
 354     int retval;
 355
 356     if (list_is_empty(&rx->recv_queue)) {
 357         return -EAGAIN;
 358     }
 359
 360     packet = ofpbuf_from_list(list_pop_front(&rx->recv_queue));
 361     rx->recv_queue_len--;
 362     if (packet->size <= size) {
 363         memcpy(buffer, packet->data, packet->size);
 364         retval = packet->size;
 365     } else {
 366         retval = -EMSGSIZE;
 367     }
 368     ofpbuf_delete(packet);
 369
 370     return retval;
 371 }
 372
 373 static void
 374 netdev_rx_dummy_destroy(struct netdev_rx *rx_)
 375 {
 376     struct netdev_rx_dummy *rx = netdev_rx_dummy_cast(rx_);
 377     list_remove(&rx->node);
 378     ofpbuf_list_delete(&rx->recv_queue);
 379     free(rx);
 380 }
 381
 382 static void
 383 netdev_rx_dummy_wait(struct netdev_rx *rx_)
 384 {
 385     struct netdev_rx_dummy *rx = netdev_rx_dummy_cast(rx_);
 386     if (!list_is_empty(&rx->recv_queue)) {
 387         poll_immediate_wake();
 388     }
 389 }
 390
 391 static int
 392 netdev_rx_dummy_drain(struct netdev_rx *rx_)
 393 {
 394     struct netdev_rx_dummy *rx = netdev_rx_dummy_cast(rx_);
 395     ofpbuf_list_delete(&rx->recv_queue);
 396     rx->recv_queue_len = 0;
 397     return 0;
 398 }
 399
 400 static int
 401 netdev_dummy_send(struct netdev *netdev, const void *buffer, size_t size)
 402 {
 403     struct netdev_dummy *dev = netdev_dummy_cast(netdev);
 404     size_t i;
 405
 406     if (size < ETH_HEADER_LEN) {
 407         return EMSGSIZE;
 408     } else {
 409         const struct eth_header *eth = buffer;
 410         int max_size;
 411
 412         max_size = dev->mtu + ETH_HEADER_LEN;
 413         if (eth->eth_type == htons(ETH_TYPE_VLAN)) {
 414             max_size += VLAN_HEADER_LEN;
 415         }
 416         if (size > max_size) {
 417             return EMSGSIZE;
 418         }
 419     }
 420
 421     dev->stats.tx_packets++;
 422     dev->stats.tx_bytes += size;
 423
 424     for (i = 0; i < dev->n_streams; i++) {
 425         struct dummy_stream *s = &dev->streams[i];
 426
 427         if (list_size(&s->txq) < NETDEV_DUMMY_MAX_QUEUE) {
 428             struct ofpbuf *b;
 429
 430             b = ofpbuf_clone_data_with_headroom(buffer, size, 2);
 431             put_unaligned_be16(ofpbuf_push_uninit(b, 2), htons(size));
 432             list_push_back(&s->txq, &b->list_node);
 433         }
 434     }
 435
 436     return 0;
 437 }
 438
 439 static int
 440 netdev_dummy_set_etheraddr(struct netdev *netdev,
 441                            const uint8_t mac[ETH_ADDR_LEN])
 442 {
 443     struct netdev_dummy *dev = netdev_dummy_cast(netdev);
 444
 445     if (!eth_addr_equals(dev->hwaddr, mac)) {
 446         memcpy(dev->hwaddr, mac, ETH_ADDR_LEN);
 447         netdev_dummy_poll_notify(dev);
 448     }
 449
 450     return 0;
 451 }
 452
 453 static int
 454 netdev_dummy_get_etheraddr(const struct netdev *netdev,
 455                            uint8_t mac[ETH_ADDR_LEN])
 456 {
 457     const struct netdev_dummy *dev = netdev_dummy_cast(netdev);
 458
 459     memcpy(mac, dev->hwaddr, ETH_ADDR_LEN);
 460     return 0;
 461 }
 462
 463 static int
 464 netdev_dummy_get_mtu(const struct netdev *netdev, int *mtup)
 465 {
 466     const struct netdev_dummy *dev = netdev_dummy_cast(netdev);
 467
 468     *mtup = dev->mtu;
 469     return 0;
 470 }
 471
 472 static int
 473 netdev_dummy_set_mtu(const struct netdev *netdev, int mtu)
 474 {
 475     struct netdev_dummy *dev = netdev_dummy_cast(netdev);
 476
 477     dev->mtu = mtu;
 478     return 0;
 479 }
 480
 481 static int
 482 netdev_dummy_get_stats(const struct netdev *netdev, struct netdev_stats *stats)
 483 {
 484     const struct netdev_dummy *dev = netdev_dummy_cast(netdev);
 485
 486     *stats = dev->stats;
 487     return 0;
 488 }
 489
 490 static int
 491 netdev_dummy_set_stats(struct netdev *netdev, const struct netdev_stats *stats)
 492 {
 493     struct netdev_dummy *dev = netdev_dummy_cast(netdev);
 494
 495     dev->stats = *stats;
 496     return 0;
 497 }
 498
 499 static int
 500 netdev_dummy_get_ifindex(const struct netdev *netdev)
 501 {
 502     struct netdev_dummy *dev = netdev_dummy_cast(netdev);
 503
 504     return dev->ifindex;
 505 }
 506
 507 static int
 508 netdev_dummy_update_flags(struct netdev *netdev_,
 509                           enum netdev_flags off, enum netdev_flags on,
 510                           enum netdev_flags *old_flagsp)
 511 {
 512     struct netdev_dummy *netdev = netdev_dummy_cast(netdev_);
 513
 514     if ((off | on) & ~(NETDEV_UP | NETDEV_PROMISC)) {
 515         return EINVAL;
 516     }
 517
 518     *old_flagsp = netdev->flags;
 519     netdev->flags |= on;
 520     netdev->flags &= ~off;
 521     if (*old_flagsp != netdev->flags) {
 522         netdev_dummy_poll_notify(netdev);
 523     }
 524     return 0;
 525 }
 526
 527 static unsigned int
 528 netdev_dummy_change_seq(const struct netdev *netdev)
 529 {
 530     return netdev_dummy_cast(netdev)->change_seq;
 531 }
 532 \f
 533 /* Helper functions. */
 534
 535 static void
 536 netdev_dummy_poll_notify(struct netdev_dummy *dev)
 537 {
 538     dev->change_seq++;
 539     if (!dev->change_seq) {
 540         dev->change_seq++;
 541     }
 542 }
 543
 544 static const struct netdev_class dummy_class = {
 545     "dummy",
 546     NULL,                       /* init */
 547     netdev_dummy_run,
 548     netdev_dummy_wait,
 549
 550     netdev_dummy_create,
 551     netdev_dummy_destroy,
 552     netdev_dummy_get_config,
 553     netdev_dummy_set_config,
 554     NULL,                       /* get_tunnel_config */
 555
 556     netdev_dummy_rx_open,
 557
 558     netdev_dummy_send,          /* send */
 559     NULL,                       /* send_wait */
 560
 561     netdev_dummy_set_etheraddr,
 562     netdev_dummy_get_etheraddr,
 563     netdev_dummy_get_mtu,
 564     netdev_dummy_set_mtu,
 565     netdev_dummy_get_ifindex,
 566     NULL,                       /* get_carrier */
 567     NULL,                       /* get_carrier_resets */
 568     NULL,                       /* get_miimon */
 569     netdev_dummy_get_stats,
 570     netdev_dummy_set_stats,
 571
 572     NULL,                       /* get_features */
 573     NULL,                       /* set_advertisements */
 574
 575     NULL,                       /* set_policing */
 576     NULL,                       /* get_qos_types */
 577     NULL,                       /* get_qos_capabilities */
 578     NULL,                       /* get_qos */
 579     NULL,                       /* set_qos */
 580     NULL,                       /* get_queue */
 581     NULL,                       /* set_queue */
 582     NULL,                       /* delete_queue */
 583     NULL,                       /* get_queue_stats */
 584     NULL,                       /* dump_queues */
 585     NULL,                       /* dump_queue_stats */
 586
 587     NULL,                       /* get_in4 */
 588     NULL,                       /* set_in4 */
 589     NULL,                       /* get_in6 */
 590     NULL,                       /* add_router */
 591     NULL,                       /* get_next_hop */
 592     NULL,                       /* get_status */
 593     NULL,                       /* arp_lookup */
 594
 595     netdev_dummy_update_flags,
 596
 597     netdev_dummy_change_seq
 598 };
 599
 600 static const struct netdev_rx_class netdev_rx_dummy_class = {
 601     netdev_rx_dummy_destroy,
 602     netdev_rx_dummy_recv,
 603     netdev_rx_dummy_wait,
 604     netdev_rx_dummy_drain,
 605 };
 606
 607 static struct ofpbuf *
 608 eth_from_packet_or_flow(const char *s)
 609 {
 610     enum odp_key_fitness fitness;
 611     struct ofpbuf *packet;
 612     struct ofpbuf odp_key;
 613     struct flow flow;
 614     int error;
 615
 616     if (!eth_from_hex(s, &packet)) {
 617         return packet;
 618     }
 619
 620     /* Convert string to datapath key.
 621      *
 622      * It would actually be nicer to parse an OpenFlow-like flow key here, but
 623      * the code for that currently calls exit() on parse error.  We have to
 624      * settle for parsing a datapath key for now.
 625      */
 626     ofpbuf_init(&odp_key, 0);
 627     error = odp_flow_from_string(s, NULL, &odp_key, NULL);
 628     if (error) {
 629         ofpbuf_uninit(&odp_key);
 630         return NULL;
 631     }
 632
 633     /* Convert odp_key to flow. */
 634     fitness = odp_flow_key_to_flow(odp_key.data, odp_key.size, &flow);
 635     if (fitness == ODP_FIT_ERROR) {
 636         ofpbuf_uninit(&odp_key);
 637         return NULL;
 638     }
 639
 640     packet = ofpbuf_new(0);
 641     flow_compose(packet, &flow);
 642
 643     ofpbuf_uninit(&odp_key);
 644     return packet;
 645 }
 646
 647 static void
 648 netdev_dummy_queue_packet__(struct netdev_rx_dummy *rx, struct ofpbuf *packet)
 649 {
 650     list_push_back(&rx->recv_queue, &packet->list_node);
 651     rx->recv_queue_len++;
 652 }
 653
 654 static void
 655 netdev_dummy_queue_packet(struct netdev_dummy *dummy, struct ofpbuf *packet)
 656 {
 657     struct netdev_rx_dummy *rx, *prev;
 658
 659     prev = NULL;
 660     LIST_FOR_EACH (rx, node, &dummy->rxes) {
 661         if (rx->recv_queue_len < NETDEV_DUMMY_MAX_QUEUE) {
 662             if (prev) {
 663                 netdev_dummy_queue_packet__(prev, ofpbuf_clone(packet));
 664             }
 665             prev = rx;
 666         }
 667     }
 668     if (prev) {
 669         netdev_dummy_queue_packet__(prev, packet);
 670     } else {
 671         ofpbuf_delete(packet);
 672     }
 673 }
 674
 675 static void
 676 netdev_dummy_receive(struct unixctl_conn *conn,
 677                      int argc, const char *argv[], void *aux OVS_UNUSED)
 678 {
 679     struct netdev_dummy *dummy_dev;
 680     int i;
 681
 682     dummy_dev = shash_find_data(&dummy_netdevs, argv[1]);
 683     if (!dummy_dev) {
 684         unixctl_command_reply_error(conn, "no such dummy netdev");
 685         return;
 686     }
 687
 688     for (i = 2; i < argc; i++) {
 689         struct ofpbuf *packet;
 690
 691         packet = eth_from_packet_or_flow(argv[i]);
 692         if (!packet) {
 693             unixctl_command_reply_error(conn, "bad packet syntax");
 694             return;
 695         }
 696
 697         dummy_dev->stats.rx_packets++;
 698         dummy_dev->stats.rx_bytes += packet->size;
 699
 700         netdev_dummy_queue_packet(dummy_dev, packet);
 701     }
 702
 703     unixctl_command_reply(conn, NULL);
 704 }
 705
 706 static void
 707 netdev_dummy_set_admin_state__(struct netdev_dummy *dev, bool admin_state)
 708 {
 709     enum netdev_flags old_flags;
 710
 711     if (admin_state) {
 712         netdev_dummy_update_flags(&dev->up, 0, NETDEV_UP, &old_flags);
 713     } else {
 714         netdev_dummy_update_flags(&dev->up, NETDEV_UP, 0, &old_flags);
 715     }
 716 }
 717
 718 static void
 719 netdev_dummy_set_admin_state(struct unixctl_conn *conn, int argc,
 720                              const char *argv[], void *aux OVS_UNUSED)
 721 {
 722     bool up;
 723
 724     if (!strcasecmp(argv[argc - 1], "up")) {
 725         up = true;
 726     } else if ( !strcasecmp(argv[argc - 1], "down")) {
 727         up = false;
 728     } else {
 729         unixctl_command_reply_error(conn, "Invalid Admin State");
 730         return;
 731     }
 732
 733     if (argc > 2) {
 734         struct netdev_dummy *dummy_dev;
 735
 736         dummy_dev = shash_find_data(&dummy_netdevs, argv[1]);
 737         if (dummy_dev) {
 738             netdev_dummy_set_admin_state__(dummy_dev, up);
 739         } else {
 740             unixctl_command_reply_error(conn, "Unknown Dummy Interface");
 741             return;
 742         }
 743     } else {
 744         struct shash_node *node;
 745
 746         SHASH_FOR_EACH (node, &dummy_netdevs) {
 747             netdev_dummy_set_admin_state__(node->data, up);
 748         }
 749     }
 750     unixctl_command_reply(conn, "OK");
 751 }
 752
 753 void
 754 netdev_dummy_register(bool override)
 755 {
 756     unixctl_command_register("netdev-dummy/receive", "NAME PACKET|FLOW...",
 757                              2, INT_MAX, netdev_dummy_receive, NULL);
 758     unixctl_command_register("netdev-dummy/set-admin-state",
 759                              "[netdev] up|down", 1, 2,
 760                              netdev_dummy_set_admin_state, NULL);
 761
 762     if (override) {
 763         struct sset types;
 764         const char *type;
 765
 766         sset_init(&types);
 767         netdev_enumerate_types(&types);
 768         SSET_FOR_EACH (type, &types) {
 769             if (!netdev_unregister_provider(type)) {
 770                 struct netdev_class *class;
 771
 772                 class = xmalloc(sizeof *class);
 773                 *class = dummy_class;
 774                 class->type = xstrdup(type);
 775                 netdev_register_provider(class);
 776             }
 777         }
 778         sset_destroy(&types);
 779     }
 780     netdev_register_provider(&dummy_class);
 781
 782     netdev_vport_tunnel_register();
 783 }