lib/netdev-vport.c

   1 /*
   2  * Copyright (c) 2010, 2011, 2012, 2013, 2014 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 "netdev-vport.h"
  20
  21 #include <errno.h>
  22 #include <fcntl.h>
  23 #include <sys/socket.h>
  24 #include <net/if.h>
  25 #include <sys/ioctl.h>
  26
  27 #include "byte-order.h"
  28 #include "csum.h"
  29 #include "daemon.h"
  30 #include "dirs.h"
  31 #include "dpif.h"
  32 #include "dp-packet.h"
  33 #include "dynamic-string.h"
  34 #include "flow.h"
  35 #include "hash.h"
  36 #include "hmap.h"
  37 #include "list.h"
  38 #include "netdev-provider.h"
  39 #include "odp-netlink.h"
  40 #include "dp-packet.h"
  41 #include "ovs-router.h"
  42 #include "packets.h"
  43 #include "poll-loop.h"
  44 #include "route-table.h"
  45 #include "shash.h"
  46 #include "socket-util.h"
  47 #include "openvswitch/vlog.h"
  48 #include "unaligned.h"
  49 #include "unixctl.h"
  50 #include "util.h"
  51
  52 VLOG_DEFINE_THIS_MODULE(netdev_vport);
  53 static struct vlog_rate_limit err_rl = VLOG_RATE_LIMIT_INIT(60, 5);
  54
  55 #define GENEVE_DST_PORT 6081
  56 #define VXLAN_DST_PORT 4789
  57 #define LISP_DST_PORT 4341
  58
  59 #define VXLAN_HLEN   (sizeof(struct eth_header) +         \
  60                       sizeof(struct ip_header)  +         \
  61                       sizeof(struct udp_header) +         \
  62                       sizeof(struct vxlanhdr))
  63
  64 #define DEFAULT_TTL 64
  65
  66 struct netdev_vport {
  67     struct netdev up;
  68
  69     /* Protects all members below. */
  70     struct ovs_mutex mutex;
  71
  72     uint8_t etheraddr[ETH_ADDR_LEN];
  73     struct netdev_stats stats;
  74
  75     /* Tunnels. */
  76     struct netdev_tunnel_config tnl_cfg;
  77     char egress_iface[IFNAMSIZ];
  78     bool carrier_status;
  79
  80     /* Patch Ports. */
  81     char *peer;
  82 };
  83
  84 struct vport_class {
  85     const char *dpif_port;
  86     struct netdev_class netdev_class;
  87 };
  88
  89 /* Last read of the route-table's change number. */
  90 static uint64_t rt_change_seqno;
  91
  92 static int netdev_vport_construct(struct netdev *);
  93 static int get_patch_config(const struct netdev *netdev, struct smap *args);
  94 static int get_tunnel_config(const struct netdev *, struct smap *args);
  95 static bool tunnel_check_status_change__(struct netdev_vport *);
  96
  97 static uint16_t tnl_udp_port_min = 32768;
  98 static uint16_t tnl_udp_port_max = 61000;
  99
 100 static bool
 101 is_vport_class(const struct netdev_class *class)
 102 {
 103     return class->construct == netdev_vport_construct;
 104 }
 105
 106 bool
 107 netdev_vport_is_vport_class(const struct netdev_class *class)
 108 {
 109     return is_vport_class(class);
 110 }
 111
 112 static const struct vport_class *
 113 vport_class_cast(const struct netdev_class *class)
 114 {
 115     ovs_assert(is_vport_class(class));
 116     return CONTAINER_OF(class, struct vport_class, netdev_class);
 117 }
 118
 119 static struct netdev_vport *
 120 netdev_vport_cast(const struct netdev *netdev)
 121 {
 122     ovs_assert(is_vport_class(netdev_get_class(netdev)));
 123     return CONTAINER_OF(netdev, struct netdev_vport, up);
 124 }
 125
 126 static const struct netdev_tunnel_config *
 127 get_netdev_tunnel_config(const struct netdev *netdev)
 128 {
 129     return &netdev_vport_cast(netdev)->tnl_cfg;
 130 }
 131
 132 bool
 133 netdev_vport_is_patch(const struct netdev *netdev)
 134 {
 135     const struct netdev_class *class = netdev_get_class(netdev);
 136
 137     return class->get_config == get_patch_config;
 138 }
 139
 140 bool
 141 netdev_vport_is_layer3(const struct netdev *dev)
 142 {
 143     const char *type = netdev_get_type(dev);
 144
 145     return (!strcmp("lisp", type));
 146 }
 147
 148 static bool
 149 netdev_vport_needs_dst_port(const struct netdev *dev)
 150 {
 151     const struct netdev_class *class = netdev_get_class(dev);
 152     const char *type = netdev_get_type(dev);
 153
 154     return (class->get_config == get_tunnel_config &&
 155             (!strcmp("geneve", type) || !strcmp("vxlan", type) ||
 156              !strcmp("lisp", type)));
 157 }
 158
 159 const char *
 160 netdev_vport_class_get_dpif_port(const struct netdev_class *class)
 161 {
 162     return is_vport_class(class) ? vport_class_cast(class)->dpif_port : NULL;
 163 }
 164
 165 const char *
 166 netdev_vport_get_dpif_port(const struct netdev *netdev,
 167                            char namebuf[], size_t bufsize)
 168 {
 169     const struct netdev_class *class = netdev_get_class(netdev);
 170     const char *dpif_port = netdev_vport_class_get_dpif_port(class);
 171
 172     if (!dpif_port) {
 173         return netdev_get_name(netdev);
 174     }
 175
 176     if (netdev_vport_needs_dst_port(netdev)) {
 177         const struct netdev_vport *vport = netdev_vport_cast(netdev);
 178
 179         /*
 180          * Note: IFNAMSIZ is 16 bytes long. Implementations should choose
 181          * a dpif port name that is short enough to fit including any
 182          * port numbers but assert just in case.
 183          */
 184         BUILD_ASSERT(NETDEV_VPORT_NAME_BUFSIZE >= IFNAMSIZ);
 185         ovs_assert(strlen(dpif_port) + 6 < IFNAMSIZ);
 186         snprintf(namebuf, bufsize, "%s_%d", dpif_port,
 187                  ntohs(vport->tnl_cfg.dst_port));
 188         return namebuf;
 189     } else {
 190         return dpif_port;
 191     }
 192 }
 193
 194 char *
 195 netdev_vport_get_dpif_port_strdup(const struct netdev *netdev)
 196 {
 197     char namebuf[NETDEV_VPORT_NAME_BUFSIZE];
 198
 199     return xstrdup(netdev_vport_get_dpif_port(netdev, namebuf,
 200                                               sizeof namebuf));
 201 }
 202
 203 /* Whenever the route-table change number is incremented,
 204  * netdev_vport_route_changed() should be called to update
 205  * the corresponding tunnel interface status. */
 206 static void
 207 netdev_vport_route_changed(void)
 208 {
 209     struct netdev **vports;
 210     size_t i, n_vports;
 211
 212     vports = netdev_get_vports(&n_vports);
 213     for (i = 0; i < n_vports; i++) {
 214         struct netdev *netdev_ = vports[i];
 215         struct netdev_vport *netdev = netdev_vport_cast(netdev_);
 216
 217         ovs_mutex_lock(&netdev->mutex);
 218         /* Finds all tunnel vports. */
 219         if (netdev->tnl_cfg.ip_dst) {
 220             if (tunnel_check_status_change__(netdev)) {
 221                 netdev_change_seq_changed(netdev_);
 222             }
 223         }
 224         ovs_mutex_unlock(&netdev->mutex);
 225
 226         netdev_close(netdev_);
 227     }
 228
 229     free(vports);
 230 }
 231
 232 static struct netdev *
 233 netdev_vport_alloc(void)
 234 {
 235     struct netdev_vport *netdev = xzalloc(sizeof *netdev);
 236     return &netdev->up;
 237 }
 238
 239 static int
 240 netdev_vport_construct(struct netdev *netdev_)
 241 {
 242     struct netdev_vport *dev = netdev_vport_cast(netdev_);
 243     const char *type = netdev_get_type(netdev_);
 244
 245     ovs_mutex_init(&dev->mutex);
 246     eth_addr_random(dev->etheraddr);
 247
 248     /* Add a default destination port for tunnel ports if none specified. */
 249     if (!strcmp(type, "geneve")) {
 250         dev->tnl_cfg.dst_port = htons(GENEVE_DST_PORT);
 251     } else if (!strcmp(type, "vxlan")) {
 252         dev->tnl_cfg.dst_port = htons(VXLAN_DST_PORT);
 253     } else if (!strcmp(type, "lisp")) {
 254         dev->tnl_cfg.dst_port = htons(LISP_DST_PORT);
 255     }
 256
 257     return 0;
 258 }
 259
 260 static void
 261 netdev_vport_destruct(struct netdev *netdev_)
 262 {
 263     struct netdev_vport *netdev = netdev_vport_cast(netdev_);
 264
 265     free(netdev->peer);
 266     ovs_mutex_destroy(&netdev->mutex);
 267 }
 268
 269 static void
 270 netdev_vport_dealloc(struct netdev *netdev_)
 271 {
 272     struct netdev_vport *netdev = netdev_vport_cast(netdev_);
 273     free(netdev);
 274 }
 275
 276 static int
 277 netdev_vport_set_etheraddr(struct netdev *netdev_,
 278                            const uint8_t mac[ETH_ADDR_LEN])
 279 {
 280     struct netdev_vport *netdev = netdev_vport_cast(netdev_);
 281
 282     ovs_mutex_lock(&netdev->mutex);
 283     memcpy(netdev->etheraddr, mac, ETH_ADDR_LEN);
 284     ovs_mutex_unlock(&netdev->mutex);
 285     netdev_change_seq_changed(netdev_);
 286
 287     return 0;
 288 }
 289
 290 static int
 291 netdev_vport_get_etheraddr(const struct netdev *netdev_,
 292                            uint8_t mac[ETH_ADDR_LEN])
 293 {
 294     struct netdev_vport *netdev = netdev_vport_cast(netdev_);
 295
 296     ovs_mutex_lock(&netdev->mutex);
 297     memcpy(mac, netdev->etheraddr, ETH_ADDR_LEN);
 298     ovs_mutex_unlock(&netdev->mutex);
 299
 300     return 0;
 301 }
 302
 303 /* Checks if the tunnel status has changed and returns a boolean.
 304  * Updates the tunnel status if it has changed. */
 305 static bool
 306 tunnel_check_status_change__(struct netdev_vport *netdev)
 307     OVS_REQUIRES(netdev->mutex)
 308 {
 309     char iface[IFNAMSIZ];
 310     bool status = false;
 311     ovs_be32 route;
 312     ovs_be32 gw;
 313
 314     iface[0] = '\0';
 315     route = netdev->tnl_cfg.ip_dst;
 316     if (ovs_router_lookup(route, iface, &gw)) {
 317         struct netdev *egress_netdev;
 318
 319         if (!netdev_open(iface, "system", &egress_netdev)) {
 320             status = netdev_get_carrier(egress_netdev);
 321             netdev_close(egress_netdev);
 322         }
 323     }
 324
 325     if (strcmp(netdev->egress_iface, iface)
 326         || netdev->carrier_status != status) {
 327         ovs_strlcpy(netdev->egress_iface, iface, IFNAMSIZ);
 328         netdev->carrier_status = status;
 329
 330         return true;
 331     }
 332
 333     return false;
 334 }
 335
 336 static int
 337 tunnel_get_status(const struct netdev *netdev_, struct smap *smap)
 338 {
 339     struct netdev_vport *netdev = netdev_vport_cast(netdev_);
 340
 341     if (netdev->egress_iface[0]) {
 342         smap_add(smap, "tunnel_egress_iface", netdev->egress_iface);
 343
 344         smap_add(smap, "tunnel_egress_iface_carrier",
 345                  netdev->carrier_status ? "up" : "down");
 346     }
 347
 348     return 0;
 349 }
 350
 351 static int
 352 netdev_vport_update_flags(struct netdev *netdev OVS_UNUSED,
 353                           enum netdev_flags off,
 354                           enum netdev_flags on OVS_UNUSED,
 355                           enum netdev_flags *old_flagsp)
 356 {
 357     if (off & (NETDEV_UP | NETDEV_PROMISC)) {
 358         return EOPNOTSUPP;
 359     }
 360
 361     *old_flagsp = NETDEV_UP | NETDEV_PROMISC;
 362     return 0;
 363 }
 364
 365 static void
 366 netdev_vport_run(void)
 367 {
 368     uint64_t seq;
 369
 370     route_table_run();
 371     seq = route_table_get_change_seq();
 372     if (rt_change_seqno != seq) {
 373         rt_change_seqno = seq;
 374         netdev_vport_route_changed();
 375     }
 376 }
 377
 378 static void
 379 netdev_vport_wait(void)
 380 {
 381     uint64_t seq;
 382
 383     route_table_wait();
 384     seq = route_table_get_change_seq();
 385     if (rt_change_seqno != seq) {
 386         poll_immediate_wake();
 387     }
 388 }
 389 \f
 390 /* Code specific to tunnel types. */
 391
 392 static ovs_be64
 393 parse_key(const struct smap *args, const char *name,
 394           bool *present, bool *flow)
 395 {
 396     const char *s;
 397
 398     *present = false;
 399     *flow = false;
 400
 401     s = smap_get(args, name);
 402     if (!s) {
 403         s = smap_get(args, "key");
 404         if (!s) {
 405             return 0;
 406         }
 407     }
 408
 409     *present = true;
 410
 411     if (!strcmp(s, "flow")) {
 412         *flow = true;
 413         return 0;
 414     } else {
 415         return htonll(strtoull(s, NULL, 0));
 416     }
 417 }
 418
 419 static int
 420 set_tunnel_config(struct netdev *dev_, const struct smap *args)
 421 {
 422     struct netdev_vport *dev = netdev_vport_cast(dev_);
 423     const char *name = netdev_get_name(dev_);
 424     const char *type = netdev_get_type(dev_);
 425     bool ipsec_mech_set, needs_dst_port, has_csum;
 426     struct netdev_tunnel_config tnl_cfg;
 427     struct smap_node *node;
 428
 429     has_csum = strstr(type, "gre") || strstr(type, "geneve") ||
 430                strstr(type, "vxlan");
 431     ipsec_mech_set = false;
 432     memset(&tnl_cfg, 0, sizeof tnl_cfg);
 433
 434     /* Add a default destination port for tunnel ports if none specified. */
 435     if (!strcmp(type, "geneve")) {
 436         tnl_cfg.dst_port = htons(GENEVE_DST_PORT);
 437     }
 438
 439     if (!strcmp(type, "vxlan")) {
 440         tnl_cfg.dst_port = htons(VXLAN_DST_PORT);
 441     }
 442
 443     if (!strcmp(type, "lisp")) {
 444         tnl_cfg.dst_port = htons(LISP_DST_PORT);
 445     }
 446
 447     needs_dst_port = netdev_vport_needs_dst_port(dev_);
 448     tnl_cfg.ipsec = strstr(type, "ipsec");
 449     tnl_cfg.dont_fragment = true;
 450
 451     SMAP_FOR_EACH (node, args) {
 452         if (!strcmp(node->key, "remote_ip")) {
 453             struct in_addr in_addr;
 454             if (!strcmp(node->value, "flow")) {
 455                 tnl_cfg.ip_dst_flow = true;
 456                 tnl_cfg.ip_dst = htonl(0);
 457             } else if (lookup_ip(node->value, &in_addr)) {
 458                 VLOG_WARN("%s: bad %s 'remote_ip'", name, type);
 459             } else if (ip_is_multicast(in_addr.s_addr)) {
 460                 VLOG_WARN("%s: multicast remote_ip="IP_FMT" not allowed",
 461                           name, IP_ARGS(in_addr.s_addr));
 462                 return EINVAL;
 463             } else {
 464                 tnl_cfg.ip_dst = in_addr.s_addr;
 465             }
 466         } else if (!strcmp(node->key, "local_ip")) {
 467             struct in_addr in_addr;
 468             if (!strcmp(node->value, "flow")) {
 469                 tnl_cfg.ip_src_flow = true;
 470                 tnl_cfg.ip_src = htonl(0);
 471             } else if (lookup_ip(node->value, &in_addr)) {
 472                 VLOG_WARN("%s: bad %s 'local_ip'", name, type);
 473             } else {
 474                 tnl_cfg.ip_src = in_addr.s_addr;
 475             }
 476         } else if (!strcmp(node->key, "tos")) {
 477             if (!strcmp(node->value, "inherit")) {
 478                 tnl_cfg.tos_inherit = true;
 479             } else {
 480                 char *endptr;
 481                 int tos;
 482                 tos = strtol(node->value, &endptr, 0);
 483                 if (*endptr == '\0' && tos == (tos & IP_DSCP_MASK)) {
 484                     tnl_cfg.tos = tos;
 485                 } else {
 486                     VLOG_WARN("%s: invalid TOS %s", name, node->value);
 487                 }
 488             }
 489         } else if (!strcmp(node->key, "ttl")) {
 490             if (!strcmp(node->value, "inherit")) {
 491                 tnl_cfg.ttl_inherit = true;
 492             } else {
 493                 tnl_cfg.ttl = atoi(node->value);
 494             }
 495         } else if (!strcmp(node->key, "dst_port") && needs_dst_port) {
 496             tnl_cfg.dst_port = htons(atoi(node->value));
 497         } else if (!strcmp(node->key, "csum") && has_csum) {
 498             if (!strcmp(node->value, "true")) {
 499                 tnl_cfg.csum = true;
 500             }
 501         } else if (!strcmp(node->key, "df_default")) {
 502             if (!strcmp(node->value, "false")) {
 503                 tnl_cfg.dont_fragment = false;
 504             }
 505         } else if (!strcmp(node->key, "peer_cert") && tnl_cfg.ipsec) {
 506             if (smap_get(args, "certificate")) {
 507                 ipsec_mech_set = true;
 508             } else {
 509                 const char *use_ssl_cert;
 510
 511                 /* If the "use_ssl_cert" is true, then "certificate" and
 512                  * "private_key" will be pulled from the SSL table.  The
 513                  * use of this option is strongly discouraged, since it
 514                  * will like be removed when multiple SSL configurations
 515                  * are supported by OVS.
 516                  */
 517                 use_ssl_cert = smap_get(args, "use_ssl_cert");
 518                 if (!use_ssl_cert || strcmp(use_ssl_cert, "true")) {
 519                     VLOG_ERR("%s: 'peer_cert' requires 'certificate' argument",
 520                              name);
 521                     return EINVAL;
 522                 }
 523                 ipsec_mech_set = true;
 524             }
 525         } else if (!strcmp(node->key, "psk") && tnl_cfg.ipsec) {
 526             ipsec_mech_set = true;
 527         } else if (tnl_cfg.ipsec
 528                 && (!strcmp(node->key, "certificate")
 529                     || !strcmp(node->key, "private_key")
 530                     || !strcmp(node->key, "use_ssl_cert"))) {
 531             /* Ignore options not used by the netdev. */
 532         } else if (!strcmp(node->key, "key") ||
 533                    !strcmp(node->key, "in_key") ||
 534                    !strcmp(node->key, "out_key")) {
 535             /* Handled separately below. */
 536         } else if (!strcmp(node->key, "exts")) {
 537             char *str = xstrdup(node->value);
 538             char *ext, *save_ptr = NULL;
 539
 540             tnl_cfg.exts = 0;
 541
 542             ext = strtok_r(str, ",", &save_ptr);
 543             while (ext) {
 544                 if (!strcmp(type, "vxlan") && !strcmp(ext, "gbp")) {
 545                     tnl_cfg.exts |= (1 << OVS_VXLAN_EXT_GBP);
 546                 } else {
 547                     VLOG_WARN("%s: unknown extension '%s'", name, ext);
 548                 }
 549
 550                 ext = strtok_r(NULL, ",", &save_ptr);
 551             }
 552
 553             free(str);
 554         } else {
 555             VLOG_WARN("%s: unknown %s argument '%s'", name, type, node->key);
 556         }
 557     }
 558
 559     if (tnl_cfg.ipsec) {
 560         static struct ovs_mutex mutex = OVS_MUTEX_INITIALIZER;
 561         static pid_t pid = 0;
 562
 563 #ifndef _WIN32
 564         ovs_mutex_lock(&mutex);
 565         if (pid <= 0) {
 566             char *file_name = xasprintf("%s/%s", ovs_rundir(),
 567                                         "ovs-monitor-ipsec.pid");
 568             pid = read_pidfile(file_name);
 569             free(file_name);
 570         }
 571         ovs_mutex_unlock(&mutex);
 572 #endif
 573
 574         if (pid < 0) {
 575             VLOG_ERR("%s: IPsec requires the ovs-monitor-ipsec daemon",
 576                      name);
 577             return EINVAL;
 578         }
 579
 580         if (smap_get(args, "peer_cert") && smap_get(args, "psk")) {
 581             VLOG_ERR("%s: cannot define both 'peer_cert' and 'psk'", name);
 582             return EINVAL;
 583         }
 584
 585         if (!ipsec_mech_set) {
 586             VLOG_ERR("%s: IPsec requires an 'peer_cert' or psk' argument",
 587                      name);
 588             return EINVAL;
 589         }
 590     }
 591
 592     if (!tnl_cfg.ip_dst && !tnl_cfg.ip_dst_flow) {
 593         VLOG_ERR("%s: %s type requires valid 'remote_ip' argument",
 594                  name, type);
 595         return EINVAL;
 596     }
 597     if (tnl_cfg.ip_src_flow && !tnl_cfg.ip_dst_flow) {
 598         VLOG_ERR("%s: %s type requires 'remote_ip=flow' with 'local_ip=flow'",
 599                  name, type);
 600         return EINVAL;
 601     }
 602     if (!tnl_cfg.ttl) {
 603         tnl_cfg.ttl = DEFAULT_TTL;
 604     }
 605
 606     tnl_cfg.in_key = parse_key(args, "in_key",
 607                                &tnl_cfg.in_key_present,
 608                                &tnl_cfg.in_key_flow);
 609
 610     tnl_cfg.out_key = parse_key(args, "out_key",
 611                                &tnl_cfg.out_key_present,
 612                                &tnl_cfg.out_key_flow);
 613
 614     ovs_mutex_lock(&dev->mutex);
 615     dev->tnl_cfg = tnl_cfg;
 616     tunnel_check_status_change__(dev);
 617     netdev_change_seq_changed(dev_);
 618     ovs_mutex_unlock(&dev->mutex);
 619
 620     return 0;
 621 }
 622
 623 static int
 624 get_tunnel_config(const struct netdev *dev, struct smap *args)
 625 {
 626     struct netdev_vport *netdev = netdev_vport_cast(dev);
 627     struct netdev_tunnel_config tnl_cfg;
 628
 629     ovs_mutex_lock(&netdev->mutex);
 630     tnl_cfg = netdev->tnl_cfg;
 631     ovs_mutex_unlock(&netdev->mutex);
 632
 633     if (tnl_cfg.ip_dst) {
 634         smap_add_format(args, "remote_ip", IP_FMT, IP_ARGS(tnl_cfg.ip_dst));
 635     } else if (tnl_cfg.ip_dst_flow) {
 636         smap_add(args, "remote_ip", "flow");
 637     }
 638
 639     if (tnl_cfg.ip_src) {
 640         smap_add_format(args, "local_ip", IP_FMT, IP_ARGS(tnl_cfg.ip_src));
 641     } else if (tnl_cfg.ip_src_flow) {
 642         smap_add(args, "local_ip", "flow");
 643     }
 644
 645     if (tnl_cfg.in_key_flow && tnl_cfg.out_key_flow) {
 646         smap_add(args, "key", "flow");
 647     } else if (tnl_cfg.in_key_present && tnl_cfg.out_key_present
 648                && tnl_cfg.in_key == tnl_cfg.out_key) {
 649         smap_add_format(args, "key", "%"PRIu64, ntohll(tnl_cfg.in_key));
 650     } else {
 651         if (tnl_cfg.in_key_flow) {
 652             smap_add(args, "in_key", "flow");
 653         } else if (tnl_cfg.in_key_present) {
 654             smap_add_format(args, "in_key", "%"PRIu64,
 655                             ntohll(tnl_cfg.in_key));
 656         }
 657
 658         if (tnl_cfg.out_key_flow) {
 659             smap_add(args, "out_key", "flow");
 660         } else if (tnl_cfg.out_key_present) {
 661             smap_add_format(args, "out_key", "%"PRIu64,
 662                             ntohll(tnl_cfg.out_key));
 663         }
 664     }
 665
 666     if (tnl_cfg.ttl_inherit) {
 667         smap_add(args, "ttl", "inherit");
 668     } else if (tnl_cfg.ttl != DEFAULT_TTL) {
 669         smap_add_format(args, "ttl", "%"PRIu8, tnl_cfg.ttl);
 670     }
 671
 672     if (tnl_cfg.tos_inherit) {
 673         smap_add(args, "tos", "inherit");
 674     } else if (tnl_cfg.tos) {
 675         smap_add_format(args, "tos", "0x%x", tnl_cfg.tos);
 676     }
 677
 678     if (tnl_cfg.dst_port) {
 679         uint16_t dst_port = ntohs(tnl_cfg.dst_port);
 680         const char *type = netdev_get_type(dev);
 681
 682         if ((!strcmp("geneve", type) && dst_port != GENEVE_DST_PORT) ||
 683             (!strcmp("vxlan", type) && dst_port != VXLAN_DST_PORT) ||
 684             (!strcmp("lisp", type) && dst_port != LISP_DST_PORT)) {
 685             smap_add_format(args, "dst_port", "%d", dst_port);
 686         }
 687     }
 688
 689     if (tnl_cfg.csum) {
 690         smap_add(args, "csum", "true");
 691     }
 692
 693     if (!tnl_cfg.dont_fragment) {
 694         smap_add(args, "df_default", "false");
 695     }
 696
 697     return 0;
 698 }
 699 \f
 700 /* Code specific to patch ports. */
 701
 702 /* If 'netdev' is a patch port, returns the name of its peer as a malloc()'d
 703  * string that the caller must free.
 704  *
 705  * If 'netdev' is not a patch port, returns NULL. */
 706 char *
 707 netdev_vport_patch_peer(const struct netdev *netdev_)
 708 {
 709     char *peer = NULL;
 710
 711     if (netdev_vport_is_patch(netdev_)) {
 712         struct netdev_vport *netdev = netdev_vport_cast(netdev_);
 713
 714         ovs_mutex_lock(&netdev->mutex);
 715         if (netdev->peer) {
 716             peer = xstrdup(netdev->peer);
 717         }
 718         ovs_mutex_unlock(&netdev->mutex);
 719     }
 720
 721     return peer;
 722 }
 723
 724 void
 725 netdev_vport_inc_rx(const struct netdev *netdev,
 726                     const struct dpif_flow_stats *stats)
 727 {
 728     if (is_vport_class(netdev_get_class(netdev))) {
 729         struct netdev_vport *dev = netdev_vport_cast(netdev);
 730
 731         ovs_mutex_lock(&dev->mutex);
 732         dev->stats.rx_packets += stats->n_packets;
 733         dev->stats.rx_bytes += stats->n_bytes;
 734         ovs_mutex_unlock(&dev->mutex);
 735     }
 736 }
 737
 738 void
 739 netdev_vport_inc_tx(const struct netdev *netdev,
 740                     const struct dpif_flow_stats *stats)
 741 {
 742     if (is_vport_class(netdev_get_class(netdev))) {
 743         struct netdev_vport *dev = netdev_vport_cast(netdev);
 744
 745         ovs_mutex_lock(&dev->mutex);
 746         dev->stats.tx_packets += stats->n_packets;
 747         dev->stats.tx_bytes += stats->n_bytes;
 748         ovs_mutex_unlock(&dev->mutex);
 749     }
 750 }
 751
 752 static int
 753 get_patch_config(const struct netdev *dev_, struct smap *args)
 754 {
 755     struct netdev_vport *dev = netdev_vport_cast(dev_);
 756
 757     ovs_mutex_lock(&dev->mutex);
 758     if (dev->peer) {
 759         smap_add(args, "peer", dev->peer);
 760     }
 761     ovs_mutex_unlock(&dev->mutex);
 762
 763     return 0;
 764 }
 765
 766 static int
 767 set_patch_config(struct netdev *dev_, const struct smap *args)
 768 {
 769     struct netdev_vport *dev = netdev_vport_cast(dev_);
 770     const char *name = netdev_get_name(dev_);
 771     const char *peer;
 772
 773     peer = smap_get(args, "peer");
 774     if (!peer) {
 775         VLOG_ERR("%s: patch type requires valid 'peer' argument", name);
 776         return EINVAL;
 777     }
 778
 779     if (smap_count(args) > 1) {
 780         VLOG_ERR("%s: patch type takes only a 'peer' argument", name);
 781         return EINVAL;
 782     }
 783
 784     if (!strcmp(name, peer)) {
 785         VLOG_ERR("%s: patch peer must not be self", name);
 786         return EINVAL;
 787     }
 788
 789     ovs_mutex_lock(&dev->mutex);
 790     free(dev->peer);
 791     dev->peer = xstrdup(peer);
 792     netdev_change_seq_changed(dev_);
 793     ovs_mutex_unlock(&dev->mutex);
 794
 795     return 0;
 796 }
 797
 798 static int
 799 get_stats(const struct netdev *netdev, struct netdev_stats *stats)
 800 {
 801     struct netdev_vport *dev = netdev_vport_cast(netdev);
 802
 803     ovs_mutex_lock(&dev->mutex);
 804     *stats = dev->stats;
 805     ovs_mutex_unlock(&dev->mutex);
 806
 807     return 0;
 808 }
 809
 810 \f
 811 /* Tunnel push pop ops. */
 812
 813 static struct ip_header *
 814 ip_hdr(void *eth)
 815 {
 816     return (void *)((char *)eth + sizeof (struct eth_header));
 817 }
 818
 819 static struct gre_base_hdr *
 820 gre_hdr(struct ip_header *ip)
 821 {
 822      return (void *)((char *)ip + sizeof (struct ip_header));
 823 }
 824
 825 static void *
 826 ip_extract_tnl_md(struct dp_packet *packet, struct flow_tnl *tnl)
 827 {
 828     struct ip_header *nh;
 829     void *l4;
 830
 831     nh = dp_packet_l3(packet);
 832     l4 = dp_packet_l4(packet);
 833
 834     if (!nh || !l4) {
 835         return NULL;
 836     }
 837
 838     tnl->ip_src = get_16aligned_be32(&nh->ip_src);
 839     tnl->ip_dst = get_16aligned_be32(&nh->ip_dst);
 840     tnl->ip_tos = nh->ip_tos;
 841
 842     return l4;
 843 }
 844
 845 /* Pushes the 'size' bytes of 'header' into the headroom of 'packet',
 846  * reallocating the packet if necessary.  'header' should contain an Ethernet
 847  * header, followed by an IPv4 header (without options), and an L4 header.
 848  *
 849  * This function sets the IP header's ip_tot_len field (which should be zeroed
 850  * as part of 'header') and puts its value into '*ip_tot_size' as well.  Also
 851  * updates IP header checksum.
 852  *
 853  * Return pointer to the L4 header added to 'packet'. */
 854 static void *
 855 push_ip_header(struct dp_packet *packet,
 856                const void *header, int size, int *ip_tot_size)
 857 {
 858     struct eth_header *eth;
 859     struct ip_header *ip;
 860
 861     eth = dp_packet_push_uninit(packet, size);
 862     *ip_tot_size = dp_packet_size(packet) - sizeof (struct eth_header);
 863
 864     memcpy(eth, header, size);
 865     ip = ip_hdr(eth);
 866     ip->ip_tot_len = htons(*ip_tot_size);
 867
 868
 869     ip->ip_csum = recalc_csum16(ip->ip_csum, 0, ip->ip_tot_len);
 870
 871     return ip + 1;
 872 }
 873
 874 static int
 875 gre_header_len(ovs_be16 flags)
 876 {
 877     int hlen = sizeof(struct eth_header) +
 878                sizeof(struct ip_header) + 4;
 879
 880     if (flags & htons(GRE_CSUM)) {
 881         hlen += 4;
 882     }
 883     if (flags & htons(GRE_KEY)) {
 884         hlen += 4;
 885     }
 886     if (flags & htons(GRE_SEQ)) {
 887         hlen += 4;
 888     }
 889     return hlen;
 890 }
 891
 892 static int
 893 parse_gre_header(struct dp_packet *packet,
 894                  struct flow_tnl *tnl)
 895 {
 896     const struct gre_base_hdr *greh;
 897     ovs_16aligned_be32 *options;
 898     int hlen;
 899
 900     greh = ip_extract_tnl_md(packet, tnl);
 901     if (!greh) {
 902         return -EINVAL;
 903     }
 904
 905     if (greh->flags & ~(htons(GRE_CSUM | GRE_KEY | GRE_SEQ))) {
 906         return -EINVAL;
 907     }
 908
 909     hlen = gre_header_len(greh->flags);
 910     if (hlen > dp_packet_size(packet)) {
 911         return -EINVAL;
 912     }
 913
 914     options = (ovs_16aligned_be32 *)(greh + 1);
 915     if (greh->flags & htons(GRE_CSUM)) {
 916         ovs_be16 pkt_csum;
 917
 918         pkt_csum = csum(greh, dp_packet_size(packet) -
 919                               ((const unsigned char *)greh -
 920                                (const unsigned char *)dp_packet_l2(packet)));
 921         if (pkt_csum) {
 922             return -EINVAL;
 923         }
 924         tnl->flags = FLOW_TNL_F_CSUM;
 925         options++;
 926     }
 927
 928     if (greh->flags & htons(GRE_KEY)) {
 929         tnl->tun_id = (OVS_FORCE ovs_be64) ((OVS_FORCE uint64_t)(get_16aligned_be32(options)) << 32);
 930         tnl->flags |= FLOW_TNL_F_KEY;
 931         options++;
 932     }
 933
 934     if (greh->flags & htons(GRE_SEQ)) {
 935         options++;
 936     }
 937
 938     return hlen;
 939 }
 940
 941 static void
 942 reset_tnl_md(struct pkt_metadata *md)
 943 {
 944     memset(&md->tunnel, 0, sizeof(md->tunnel));
 945 }
 946
 947 static void
 948 gre_extract_md(struct dp_packet *packet)
 949 {
 950     struct pkt_metadata *md = &packet->md;
 951     struct flow_tnl *tnl = &md->tunnel;
 952     int hlen = sizeof(struct eth_header) +
 953                sizeof(struct ip_header) + 4;
 954
 955     memset(md, 0, sizeof *md);
 956     if (hlen > dp_packet_size(packet)) {
 957         return;
 958     }
 959
 960     hlen = parse_gre_header(packet, tnl);
 961     if (hlen < 0) {
 962         reset_tnl_md(md);
 963     }
 964
 965     dp_packet_reset_packet(packet, hlen);
 966 }
 967
 968 static int
 969 netdev_gre_pop_header(struct netdev *netdev_ OVS_UNUSED,
 970                       struct dp_packet **pkt, int cnt)
 971 {
 972     int i;
 973
 974     for (i = 0; i < cnt; i++) {
 975         gre_extract_md(pkt[i]);
 976     }
 977     return 0;
 978 }
 979
 980 static void
 981 netdev_gre_push_header__(struct dp_packet *packet,
 982                          const void *header, int size)
 983 {
 984     struct gre_base_hdr *greh;
 985     int ip_tot_size;
 986
 987     greh = push_ip_header(packet, header, size,  &ip_tot_size);
 988
 989     if (greh->flags & htons(GRE_CSUM)) {
 990         ovs_16aligned_be32 *options = (ovs_16aligned_be32 *) (greh + 1);
 991
 992         put_16aligned_be32(options,
 993                            (OVS_FORCE ovs_be32) csum(greh, ip_tot_size - sizeof (struct ip_header)));
 994     }
 995 }
 996
 997 static int
 998 netdev_gre_push_header(const struct netdev *netdev OVS_UNUSED,
 999                        struct dp_packet **packets, int cnt,
1000                        const struct ovs_action_push_tnl *data)
1001 {
1002     int i;
1003
1004     for (i = 0; i < cnt; i++) {
1005         netdev_gre_push_header__(packets[i], data->header, data->header_len);
1006         packets[i]->md = PKT_METADATA_INITIALIZER(u32_to_odp(data->out_port));
1007     }
1008     return 0;
1009 }
1010
1011
1012 static int
1013 netdev_gre_build_header(const struct netdev *netdev,
1014                         struct ovs_action_push_tnl *data,
1015                         const struct flow *tnl_flow)
1016 {
1017     struct netdev_vport *dev = netdev_vport_cast(netdev);
1018     struct netdev_tunnel_config *tnl_cfg;
1019     struct ip_header *ip;
1020     struct gre_base_hdr *greh;
1021     ovs_16aligned_be32 *options;
1022     int hlen;
1023
1024     /* XXX: RCUfy tnl_cfg. */
1025     ovs_mutex_lock(&dev->mutex);
1026     tnl_cfg = &dev->tnl_cfg;
1027
1028     ip = ip_hdr(data->header);
1029     ip->ip_proto = IPPROTO_GRE;
1030
1031     greh = gre_hdr(ip);
1032     greh->protocol = htons(ETH_TYPE_TEB);
1033     greh->flags = 0;
1034
1035     options = (ovs_16aligned_be32 *) (greh + 1);
1036     if (tnl_cfg->csum) {
1037         greh->flags |= htons(GRE_CSUM);
1038         put_16aligned_be32(options, 0);
1039         options++;
1040     }
1041
1042     if (tnl_cfg->out_key_present) {
1043         greh->flags |= htons(GRE_KEY);
1044         put_16aligned_be32(options, (OVS_FORCE ovs_be32)
1045                                     ((OVS_FORCE uint64_t) tnl_flow->tunnel.tun_id >> 32));
1046         options++;
1047     }
1048
1049     ovs_mutex_unlock(&dev->mutex);
1050
1051     hlen = (uint8_t *) options - (uint8_t *) greh;
1052
1053     data->header_len = sizeof(struct eth_header) +
1054                        sizeof(struct ip_header)  + hlen;
1055     data->tnl_type = OVS_VPORT_TYPE_GRE;
1056     return 0;
1057 }
1058
1059 static void
1060 vxlan_extract_md(struct dp_packet *packet)
1061 {
1062     struct pkt_metadata *md = &packet->md;
1063     struct flow_tnl *tnl = &md->tunnel;
1064     struct udp_header *udp;
1065     struct vxlanhdr *vxh;
1066
1067     memset(md, 0, sizeof *md);
1068     if (VXLAN_HLEN > dp_packet_size(packet)) {
1069         return;
1070     }
1071
1072     udp = ip_extract_tnl_md(packet, tnl);
1073     if (!udp) {
1074         return;
1075     }
1076     vxh = (struct vxlanhdr *) (udp + 1);
1077
1078     if (get_16aligned_be32(&vxh->vx_flags) != htonl(VXLAN_FLAGS) ||
1079        (get_16aligned_be32(&vxh->vx_vni) & htonl(0xff))) {
1080         VLOG_WARN_RL(&err_rl, "invalid vxlan flags=%#x vni=%#x\n",
1081                      ntohl(get_16aligned_be32(&vxh->vx_flags)),
1082                      ntohl(get_16aligned_be32(&vxh->vx_vni)));
1083         reset_tnl_md(md);
1084         return;
1085     }
1086     tnl->tp_src = udp->udp_src;
1087     tnl->tp_dst = udp->udp_dst;
1088     tnl->tun_id = htonll(ntohl(get_16aligned_be32(&vxh->vx_vni)) >> 8);
1089
1090     dp_packet_reset_packet(packet, VXLAN_HLEN);
1091 }
1092
1093 static int
1094 netdev_vxlan_pop_header(struct netdev *netdev_ OVS_UNUSED,
1095                         struct dp_packet **pkt, int cnt)
1096 {
1097     int i;
1098
1099     for (i = 0; i < cnt; i++) {
1100         vxlan_extract_md(pkt[i]);
1101     }
1102     return 0;
1103 }
1104
1105 static int
1106 netdev_vxlan_build_header(const struct netdev *netdev,
1107                           struct ovs_action_push_tnl *data,
1108                           const struct flow *tnl_flow)
1109 {
1110     struct netdev_vport *dev = netdev_vport_cast(netdev);
1111     struct netdev_tunnel_config *tnl_cfg;
1112     struct ip_header *ip;
1113     struct udp_header *udp;
1114     struct vxlanhdr *vxh;
1115
1116     /* XXX: RCUfy tnl_cfg. */
1117     ovs_mutex_lock(&dev->mutex);
1118     tnl_cfg = &dev->tnl_cfg;
1119
1120     ip = ip_hdr(data->header);
1121     ip->ip_proto = IPPROTO_UDP;
1122
1123     udp = (struct udp_header *) (ip + 1);
1124     udp->udp_dst = tnl_cfg->dst_port;
1125
1126     vxh = (struct vxlanhdr *) (udp + 1);
1127     put_16aligned_be32(&vxh->vx_flags, htonl(VXLAN_FLAGS));
1128     put_16aligned_be32(&vxh->vx_vni, htonl(ntohll(tnl_flow->tunnel.tun_id) << 8));
1129
1130     ovs_mutex_unlock(&dev->mutex);
1131     data->header_len = VXLAN_HLEN;
1132     data->tnl_type = OVS_VPORT_TYPE_VXLAN;
1133     return 0;
1134 }
1135
1136 static ovs_be16
1137 get_src_port(struct dp_packet *packet)
1138 {
1139     uint32_t hash;
1140
1141     hash = dp_packet_get_dp_hash(packet);
1142
1143     return htons((((uint64_t) hash * (tnl_udp_port_max - tnl_udp_port_min)) >> 32) +
1144                  tnl_udp_port_min);
1145 }
1146
1147 static void
1148 netdev_vxlan_push_header__(struct dp_packet *packet,
1149                            const void *header, int size)
1150 {
1151     struct udp_header *udp;
1152     int ip_tot_size;
1153
1154     udp = push_ip_header(packet, header, size, &ip_tot_size);
1155
1156     /* set udp src port */
1157     udp->udp_src = get_src_port(packet);
1158     udp->udp_len = htons(ip_tot_size - sizeof (struct ip_header));
1159     /* udp_csum is zero */
1160 }
1161
1162 static int
1163 netdev_vxlan_push_header(const struct netdev *netdev OVS_UNUSED,
1164                          struct dp_packet **packets, int cnt,
1165                          const struct ovs_action_push_tnl *data)
1166 {
1167     int i;
1168
1169     for (i = 0; i < cnt; i++) {
1170         netdev_vxlan_push_header__(packets[i],
1171                                    data->header, VXLAN_HLEN);
1172         packets[i]->md = PKT_METADATA_INITIALIZER(u32_to_odp(data->out_port));
1173     }
1174     return 0;
1175 }
1176
1177 static void
1178 netdev_vport_range(struct unixctl_conn *conn, int argc,
1179                    const char *argv[], void *aux OVS_UNUSED)
1180 {
1181     int val1, val2;
1182
1183     if (argc < 3) {
1184         struct ds ds = DS_EMPTY_INITIALIZER;
1185
1186         ds_put_format(&ds, "Tunnel UDP source port range: %"PRIu16"-%"PRIu16"\n",
1187                             tnl_udp_port_min, tnl_udp_port_max);
1188
1189         unixctl_command_reply(conn, ds_cstr(&ds));
1190         ds_destroy(&ds);
1191         return;
1192     }
1193
1194     if (argc != 3) {
1195         return;
1196     }
1197
1198     val1 = atoi(argv[1]);
1199     if (val1 <= 0 || val1 > UINT16_MAX) {
1200         unixctl_command_reply(conn, "Invalid min.");
1201         return;
1202     }
1203     val2 = atoi(argv[2]);
1204     if (val2 <= 0 || val2 > UINT16_MAX) {
1205         unixctl_command_reply(conn, "Invalid max.");
1206         return;
1207     }
1208
1209     if (val1 > val2) {
1210         tnl_udp_port_min = val2;
1211         tnl_udp_port_max = val1;
1212     } else {
1213         tnl_udp_port_min = val1;
1214         tnl_udp_port_max = val2;
1215     }
1216     seq_change(tnl_conf_seq);
1217
1218     unixctl_command_reply(conn, "OK");
1219 }
1220
1221 \f
1222 #define VPORT_FUNCTIONS(GET_CONFIG, SET_CONFIG,             \
1223                         GET_TUNNEL_CONFIG, GET_STATUS,      \
1224                         BUILD_HEADER,                       \
1225                         PUSH_HEADER, POP_HEADER)            \
1226     NULL,                                                   \
1227     netdev_vport_run,                                       \
1228     netdev_vport_wait,                                      \
1229                                                             \
1230     netdev_vport_alloc,                                     \
1231     netdev_vport_construct,                                 \
1232     netdev_vport_destruct,                                  \
1233     netdev_vport_dealloc,                                   \
1234     GET_CONFIG,                                             \
1235     SET_CONFIG,                                             \
1236     GET_TUNNEL_CONFIG,                                      \
1237     BUILD_HEADER,                                           \
1238     PUSH_HEADER,                                            \
1239     POP_HEADER,                                             \
1240     NULL,                       /* get_numa_id */           \
1241     NULL,                       /* set_multiq */            \
1242                                                             \
1243     NULL,                       /* send */                  \
1244     NULL,                       /* send_wait */             \
1245                                                             \
1246     netdev_vport_set_etheraddr,                             \
1247     netdev_vport_get_etheraddr,                             \
1248     NULL,                       /* get_mtu */               \
1249     NULL,                       /* set_mtu */               \
1250     NULL,                       /* get_ifindex */           \
1251     NULL,                       /* get_carrier */           \
1252     NULL,                       /* get_carrier_resets */    \
1253     NULL,                       /* get_miimon */            \
1254     get_stats,                                              \
1255                                                             \
1256     NULL,                       /* get_features */          \
1257     NULL,                       /* set_advertisements */    \
1258                                                             \
1259     NULL,                       /* set_policing */          \
1260     NULL,                       /* get_qos_types */         \
1261     NULL,                       /* get_qos_capabilities */  \
1262     NULL,                       /* get_qos */               \
1263     NULL,                       /* set_qos */               \
1264     NULL,                       /* get_queue */             \
1265     NULL,                       /* set_queue */             \
1266     NULL,                       /* delete_queue */          \
1267     NULL,                       /* get_queue_stats */       \
1268     NULL,                       /* queue_dump_start */      \
1269     NULL,                       /* queue_dump_next */       \
1270     NULL,                       /* queue_dump_done */       \
1271     NULL,                       /* dump_queue_stats */      \
1272                                                             \
1273     NULL,                       /* get_in4 */               \
1274     NULL,                       /* set_in4 */               \
1275     NULL,                       /* get_in6 */               \
1276     NULL,                       /* add_router */            \
1277     NULL,                       /* get_next_hop */          \
1278     GET_STATUS,                                             \
1279     NULL,                       /* arp_lookup */            \
1280                                                             \
1281     netdev_vport_update_flags,                              \
1282                                                             \
1283     NULL,                   /* rx_alloc */                  \
1284     NULL,                   /* rx_construct */              \
1285     NULL,                   /* rx_destruct */               \
1286     NULL,                   /* rx_dealloc */                \
1287     NULL,                   /* rx_recv */                   \
1288     NULL,                   /* rx_wait */                   \
1289     NULL,                   /* rx_drain */
1290
1291
1292 #define TUNNEL_CLASS(NAME, DPIF_PORT, BUILD_HEADER, PUSH_HEADER, POP_HEADER)   \
1293     { DPIF_PORT,                                                               \
1294         { NAME, VPORT_FUNCTIONS(get_tunnel_config,                             \
1295                                 set_tunnel_config,                             \
1296                                 get_netdev_tunnel_config,                      \
1297                                 tunnel_get_status,                             \
1298                                 BUILD_HEADER, PUSH_HEADER, POP_HEADER) }}
1299
1300 void
1301 netdev_vport_tunnel_register(void)
1302 {
1303     /* The name of the dpif_port should be short enough to accomodate adding
1304      * a port number to the end if one is necessary. */
1305     static const struct vport_class vport_classes[] = {
1306         TUNNEL_CLASS("geneve", "genev_sys", NULL, NULL, NULL),
1307         TUNNEL_CLASS("gre", "gre_sys", netdev_gre_build_header,
1308                                        netdev_gre_push_header,
1309                                        netdev_gre_pop_header),
1310         TUNNEL_CLASS("ipsec_gre", "gre_sys", NULL, NULL, NULL),
1311         TUNNEL_CLASS("gre64", "gre64_sys", NULL,  NULL, NULL),
1312         TUNNEL_CLASS("ipsec_gre64", "gre64_sys", NULL, NULL, NULL),
1313         TUNNEL_CLASS("vxlan", "vxlan_sys", netdev_vxlan_build_header,
1314                                            netdev_vxlan_push_header,
1315                                            netdev_vxlan_pop_header),
1316         TUNNEL_CLASS("lisp", "lisp_sys", NULL, NULL, NULL)
1317     };
1318     static struct ovsthread_once once = OVSTHREAD_ONCE_INITIALIZER;
1319
1320     if (ovsthread_once_start(&once)) {
1321         int i;
1322
1323         for (i = 0; i < ARRAY_SIZE(vport_classes); i++) {
1324             netdev_register_provider(&vport_classes[i].netdev_class);
1325         }
1326
1327         unixctl_command_register("tnl/egress_port_range", "min max", 0, 2,
1328                                  netdev_vport_range, NULL);
1329
1330         ovsthread_once_done(&once);
1331     }
1332 }
1333
1334 void
1335 netdev_vport_patch_register(void)
1336 {
1337     static const struct vport_class patch_class =
1338         { NULL,
1339             { "patch", VPORT_FUNCTIONS(get_patch_config,
1340                                        set_patch_config,
1341                                        NULL,
1342                                        NULL, NULL, NULL, NULL) }};
1343     netdev_register_provider(&patch_class.netdev_class);
1344 }