ip/iplink_vxlan.c

   1 /*
   2  * iplink_vxlan.c       VXLAN device support
   3  *
   4  *              This program is free software; you can redistribute it and/or
   5  *              modify it under the terms of the GNU General Public License
   6  *              as published by the Free Software Foundation; either version
   7  *              2 of the License, or (at your option) any later version.
   8  *
   9  * Authors:     Stephen Hemminger <shemminger@vyatta.com
  10  */
  11
  12 #include <stdio.h>
  13 #include <stdlib.h>
  14 #include <string.h>
  15 #include <net/if.h>
  16 #include <linux/ip.h>
  17 #include <linux/if_link.h>
  18 #include <arpa/inet.h>
  19
  20 #include "rt_names.h"
  21 #include "utils.h"
  22 #include "ip_common.h"
  23
  24 static void print_explain(FILE *f)
  25 {
  26         fprintf(f,
  27                 "Usage: ... vxlan id VNI\n"
  28                 "                 [ { group | remote } IP_ADDRESS ]\n"
  29                 "                 [ local ADDR ]\n"
  30                 "                 [ ttl TTL ]\n"
  31                 "                 [ tos TOS ]\n"
  32                 "                 [ flowlabel LABEL ]\n"
  33                 "                 [ dev PHYS_DEV ]\n"
  34                 "                 [ dstport PORT ]\n"
  35                 "                 [ srcport MIN MAX ]\n"
  36                 "                 [ [no]learning ]\n"
  37                 "                 [ [no]proxy ]\n"
  38                 "                 [ [no]rsc ]\n"
  39                 "                 [ [no]l2miss ]\n"
  40                 "                 [ [no]l3miss ]\n"
  41                 "                 [ ageing SECONDS ]\n"
  42                 "                 [ maxaddress NUMBER ]\n"
  43                 "                 [ [no]udpcsum ]\n"
  44                 "                 [ [no]udp6zerocsumtx ]\n"
  45                 "                 [ [no]udp6zerocsumrx ]\n"
  46                 "                 [ [no]remcsumtx ] [ [no]remcsumrx ]\n"
  47                 "                 [ [no]external ] [ gbp ] [ gpe ]\n"
  48                 "\n"
  49                 "Where: VNI   := 0-16777215\n"
  50                 "       ADDR  := { IP_ADDRESS | any }\n"
  51                 "       TOS   := { NUMBER | inherit }\n"
  52                 "       TTL   := { 1..255 | inherit }\n"
  53                 "       LABEL := 0-1048575\n"
  54         );
  55 }
  56
  57 static void explain(void)
  58 {
  59         print_explain(stderr);
  60 }
  61
  62 static int vxlan_parse_opt(struct link_util *lu, int argc, char **argv,
  63                           struct nlmsghdr *n)
  64 {
  65         __u32 vni = 0;
  66         int vni_set = 0;
  67         __u32 saddr = 0;
  68         __u32 gaddr = 0;
  69         __u32 daddr = 0;
  70         struct in6_addr saddr6 = IN6ADDR_ANY_INIT;
  71         struct in6_addr gaddr6 = IN6ADDR_ANY_INIT;
  72         struct in6_addr daddr6 = IN6ADDR_ANY_INIT;
  73         unsigned int link = 0;
  74         __u8 tos = 0;
  75         __u8 ttl = 0;
  76         __u32 label = 0;
  77         __u8 learning = 1;
  78         __u8 proxy = 0;
  79         __u8 rsc = 0;
  80         __u8 l2miss = 0;
  81         __u8 l3miss = 0;
  82         __u8 noage = 0;
  83         __u32 age = 0;
  84         __u32 maxaddr = 0;
  85         __u16 dstport = 0;
  86         __u8 udpcsum = 0;
  87         bool udpcsum_set = false;
  88         __u8 udp6zerocsumtx = 0;
  89         bool udp6zerocsumtx_set = false;
  90         __u8 udp6zerocsumrx = 0;
  91         bool udp6zerocsumrx_set = false;
  92         __u8 remcsumtx = 0;
  93         __u8 remcsumrx = 0;
  94         __u8 metadata = 0;
  95         __u8 gbp = 0;
  96         __u8 gpe = 0;
  97         int dst_port_set = 0;
  98         struct ifla_vxlan_port_range range = { 0, 0 };
  99
 100         while (argc > 0) {
 101                 if (!matches(*argv, "id") ||
 102                     !matches(*argv, "vni")) {
 103                         NEXT_ARG();
 104                         if (get_u32(&vni, *argv, 0) ||
 105                             vni >= 1u << 24)
 106                                 invarg("invalid id", *argv);
 107                         vni_set = 1;
 108                 } else if (!matches(*argv, "group")) {
 109                         NEXT_ARG();
 110                         if (!inet_get_addr(*argv, &gaddr, &gaddr6)) {
 111                                 fprintf(stderr, "Invalid address \"%s\"\n", *argv);
 112                                 return -1;
 113                         }
 114                         if (!IN6_IS_ADDR_MULTICAST(&gaddr6) && !IN_MULTICAST(ntohl(gaddr)))
 115                                 invarg("invalid group address", *argv);
 116                 } else if (!matches(*argv, "remote")) {
 117                         NEXT_ARG();
 118                         if (!inet_get_addr(*argv, &daddr, &daddr6)) {
 119                                 fprintf(stderr, "Invalid address \"%s\"\n", *argv);
 120                                 return -1;
 121                         }
 122                         if (IN6_IS_ADDR_MULTICAST(&daddr6) || IN_MULTICAST(ntohl(daddr)))
 123                                 invarg("invalid remote address", *argv);
 124                 } else if (!matches(*argv, "local")) {
 125                         NEXT_ARG();
 126                         if (strcmp(*argv, "any")) {
 127                                 if (!inet_get_addr(*argv, &saddr, &saddr6)) {
 128                                         fprintf(stderr, "Invalid address \"%s\"\n", *argv);
 129                                         return -1;
 130                                 }
 131                         }
 132
 133                         if (IN_MULTICAST(ntohl(saddr)) || IN6_IS_ADDR_MULTICAST(&saddr6))
 134                                 invarg("invalid local address", *argv);
 135                 } else if (!matches(*argv, "dev")) {
 136                         NEXT_ARG();
 137                         link = if_nametoindex(*argv);
 138                         if (link == 0) {
 139                                 fprintf(stderr, "Cannot find device \"%s\"\n",
 140                                         *argv);
 141                                 exit(-1);
 142                         }
 143                 } else if (!matches(*argv, "ttl") ||
 144                            !matches(*argv, "hoplimit")) {
 145                         unsigned int uval;
 146
 147                         NEXT_ARG();
 148                         if (strcmp(*argv, "inherit") != 0) {
 149                                 if (get_unsigned(&uval, *argv, 0))
 150                                         invarg("invalid TTL", *argv);
 151                                 if (uval > 255)
 152                                         invarg("TTL must be <= 255", *argv);
 153                                 ttl = uval;
 154                         }
 155                 } else if (!matches(*argv, "tos") ||
 156                            !matches(*argv, "dsfield")) {
 157                         __u32 uval;
 158
 159                         NEXT_ARG();
 160                         if (strcmp(*argv, "inherit") != 0) {
 161                                 if (rtnl_dsfield_a2n(&uval, *argv))
 162                                         invarg("bad TOS value", *argv);
 163                                 tos = uval;
 164                         } else
 165                                 tos = 1;
 166                 } else if (!matches(*argv, "label") ||
 167                            !matches(*argv, "flowlabel")) {
 168                         __u32 uval;
 169
 170                         NEXT_ARG();
 171                         if (get_u32(&uval, *argv, 0) ||
 172                             (uval & ~LABEL_MAX_MASK))
 173                                 invarg("invalid flowlabel", *argv);
 174                         label = htonl(uval);
 175                 } else if (!matches(*argv, "ageing")) {
 176                         NEXT_ARG();
 177                         if (strcmp(*argv, "none") == 0)
 178                                 noage = 1;
 179                         else if (get_u32(&age, *argv, 0))
 180                                 invarg("ageing timer", *argv);
 181                 } else if (!matches(*argv, "maxaddress")) {
 182                         NEXT_ARG();
 183                         if (strcmp(*argv, "unlimited") == 0)
 184                                 maxaddr = 0;
 185                         else if (get_u32(&maxaddr, *argv, 0))
 186                                 invarg("max addresses", *argv);
 187                 } else if (!matches(*argv, "port") ||
 188                            !matches(*argv, "srcport")) {
 189                         NEXT_ARG();
 190                         if (get_be16(&range.low, *argv, 0))
 191                                 invarg("min port", *argv);
 192                         NEXT_ARG();
 193                         if (get_be16(&range.high, *argv, 0))
 194                                 invarg("max port", *argv);
 195                 } else if (!matches(*argv, "dstport")) {
 196                         NEXT_ARG();
 197                         if (get_u16(&dstport, *argv, 0))
 198                                 invarg("dst port", *argv);
 199                         dst_port_set = 1;
 200                 } else if (!matches(*argv, "nolearning")) {
 201                         learning = 0;
 202                 } else if (!matches(*argv, "learning")) {
 203                         learning = 1;
 204                 } else if (!matches(*argv, "noproxy")) {
 205                         proxy = 0;
 206                 } else if (!matches(*argv, "proxy")) {
 207                         proxy = 1;
 208                 } else if (!matches(*argv, "norsc")) {
 209                         rsc = 0;
 210                 } else if (!matches(*argv, "rsc")) {
 211                         rsc = 1;
 212                 } else if (!matches(*argv, "nol2miss")) {
 213                         l2miss = 0;
 214                 } else if (!matches(*argv, "l2miss")) {
 215                         l2miss = 1;
 216                 } else if (!matches(*argv, "nol3miss")) {
 217                         l3miss = 0;
 218                 } else if (!matches(*argv, "l3miss")) {
 219                         l3miss = 1;
 220                 } else if (!matches(*argv, "udpcsum")) {
 221                         udpcsum = 1;
 222                         udpcsum_set = true;
 223                 } else if (!matches(*argv, "noudpcsum")) {
 224                         udpcsum = 0;
 225                         udpcsum_set = true;
 226                 } else if (!matches(*argv, "udp6zerocsumtx")) {
 227                         udp6zerocsumtx = 1;
 228                         udp6zerocsumtx_set = true;
 229                 } else if (!matches(*argv, "noudp6zerocsumtx")) {
 230                         udp6zerocsumtx = 0;
 231                         udp6zerocsumtx_set = true;
 232                 } else if (!matches(*argv, "udp6zerocsumrx")) {
 233                         udp6zerocsumrx = 1;
 234                         udp6zerocsumrx_set = true;
 235                 } else if (!matches(*argv, "noudp6zerocsumrx")) {
 236                         udp6zerocsumrx = 0;
 237                         udp6zerocsumrx_set = true;
 238                 } else if (!matches(*argv, "remcsumtx")) {
 239                         remcsumtx = 1;
 240                 } else if (!matches(*argv, "noremcsumtx")) {
 241                         remcsumtx = 0;
 242                 } else if (!matches(*argv, "remcsumrx")) {
 243                         remcsumrx = 1;
 244                 } else if (!matches(*argv, "noremcsumrx")) {
 245                         remcsumrx = 0;
 246                 } else if (!matches(*argv, "external")) {
 247                         metadata = 1;
 248                         learning = 0;
 249                 } else if (!matches(*argv, "noexternal")) {
 250                         metadata = 0;
 251                 } else if (!matches(*argv, "gbp")) {
 252                         gbp = 1;
 253                 } else if (!matches(*argv, "gpe")) {
 254                         gpe = 1;
 255                 } else if (matches(*argv, "help") == 0) {
 256                         explain();
 257                         return -1;
 258                 } else {
 259                         fprintf(stderr, "vxlan: unknown command \"%s\"?\n", *argv);
 260                         explain();
 261                         return -1;
 262                 }
 263                 argc--, argv++;
 264         }
 265
 266         if (metadata && vni_set) {
 267                 fprintf(stderr, "vxlan: both 'external' and vni cannot be specified\n");
 268                 return -1;
 269         }
 270
 271         if (!metadata && !vni_set) {
 272                 fprintf(stderr, "vxlan: missing virtual network identifier\n");
 273                 return -1;
 274         }
 275
 276         if ((gaddr && daddr) ||
 277             (!IN6_IS_ADDR_UNSPECIFIED(&gaddr6) &&
 278              !IN6_IS_ADDR_UNSPECIFIED(&daddr6))) {
 279                 fprintf(stderr, "vxlan: both group and remote cannot be specified\n");
 280                 return -1;
 281         }
 282
 283         if ((gaddr || !IN6_IS_ADDR_UNSPECIFIED(&gaddr6)) && !link) {
 284                 fprintf(stderr, "vxlan: 'group' requires 'dev' to be specified\n");
 285                 return -1;
 286         }
 287
 288         if (!dst_port_set && gpe) {
 289                 dstport = 4790;
 290         } else if (!dst_port_set) {
 291                 fprintf(stderr, "vxlan: destination port not specified\n"
 292                         "Will use Linux kernel default (non-standard value)\n");
 293                 fprintf(stderr,
 294                         "Use 'dstport 4789' to get the IANA assigned value\n"
 295                         "Use 'dstport 0' to get default and quiet this message\n");
 296         }
 297
 298         addattr32(n, 1024, IFLA_VXLAN_ID, vni);
 299         if (gaddr)
 300                 addattr_l(n, 1024, IFLA_VXLAN_GROUP, &gaddr, 4);
 301         else if (daddr)
 302                 addattr_l(n, 1024, IFLA_VXLAN_GROUP, &daddr, 4);
 303         else if (!IN6_IS_ADDR_UNSPECIFIED(&gaddr6))
 304                 addattr_l(n, 1024, IFLA_VXLAN_GROUP6, &gaddr6, sizeof(struct in6_addr));
 305         else if (!IN6_IS_ADDR_UNSPECIFIED(&daddr6))
 306                 addattr_l(n, 1024, IFLA_VXLAN_GROUP6, &daddr6, sizeof(struct in6_addr));
 307         else if (preferred_family == AF_INET)
 308                 addattr_l(n, 1024, IFLA_VXLAN_GROUP, &daddr, 4);
 309         else if (preferred_family == AF_INET6)
 310                 addattr_l(n, 1024, IFLA_VXLAN_GROUP6, &daddr6, sizeof(struct in6_addr));
 311
 312         if (saddr)
 313                 addattr_l(n, 1024, IFLA_VXLAN_LOCAL, &saddr, 4);
 314         else if (!IN6_IS_ADDR_UNSPECIFIED(&saddr6))
 315                 addattr_l(n, 1024, IFLA_VXLAN_LOCAL6, &saddr6, sizeof(struct in6_addr));
 316
 317         if (link)
 318                 addattr32(n, 1024, IFLA_VXLAN_LINK, link);
 319         addattr32(n, 1024, IFLA_VXLAN_LABEL, label);
 320         addattr8(n, 1024, IFLA_VXLAN_TTL, ttl);
 321         addattr8(n, 1024, IFLA_VXLAN_TOS, tos);
 322         addattr8(n, 1024, IFLA_VXLAN_LEARNING, learning);
 323         addattr8(n, 1024, IFLA_VXLAN_PROXY, proxy);
 324         addattr8(n, 1024, IFLA_VXLAN_RSC, rsc);
 325         addattr8(n, 1024, IFLA_VXLAN_L2MISS, l2miss);
 326         addattr8(n, 1024, IFLA_VXLAN_L3MISS, l3miss);
 327         addattr8(n, 1024, IFLA_VXLAN_REMCSUM_TX, remcsumtx);
 328         addattr8(n, 1024, IFLA_VXLAN_REMCSUM_RX, remcsumrx);
 329         addattr8(n, 1024, IFLA_VXLAN_COLLECT_METADATA, metadata);
 330
 331         if (udpcsum_set)
 332                 addattr8(n, 1024, IFLA_VXLAN_UDP_CSUM, udpcsum);
 333         if (udp6zerocsumtx_set)
 334                 addattr8(n, 1024, IFLA_VXLAN_UDP_ZERO_CSUM6_TX, udp6zerocsumtx);
 335         if (udp6zerocsumrx_set)
 336                 addattr8(n, 1024, IFLA_VXLAN_UDP_ZERO_CSUM6_RX, udp6zerocsumrx);
 337         if (noage)
 338                 addattr32(n, 1024, IFLA_VXLAN_AGEING, 0);
 339         else if (age)
 340                 addattr32(n, 1024, IFLA_VXLAN_AGEING, age);
 341         if (maxaddr)
 342                 addattr32(n, 1024, IFLA_VXLAN_LIMIT, maxaddr);
 343         if (range.low || range.high)
 344                 addattr_l(n, 1024, IFLA_VXLAN_PORT_RANGE,
 345                           &range, sizeof(range));
 346         if (dstport)
 347                 addattr16(n, 1024, IFLA_VXLAN_PORT, htons(dstport));
 348
 349         if (gbp)
 350                 addattr_l(n, 1024, IFLA_VXLAN_GBP, NULL, 0);
 351         if (gpe)
 352                 addattr_l(n, 1024, IFLA_VXLAN_GPE, NULL, 0);
 353
 354
 355         return 0;
 356 }
 357
 358 static void vxlan_print_opt(struct link_util *lu, FILE *f, struct rtattr *tb[])
 359 {
 360         __u32 vni;
 361         unsigned int link;
 362         __u8 tos;
 363         __u32 maxaddr;
 364         char s2[64];
 365
 366         if (!tb)
 367                 return;
 368
 369         if (!tb[IFLA_VXLAN_ID] ||
 370             RTA_PAYLOAD(tb[IFLA_VXLAN_ID]) < sizeof(__u32))
 371                 return;
 372
 373         vni = rta_getattr_u32(tb[IFLA_VXLAN_ID]);
 374         fprintf(f, "id %u ", vni);
 375
 376         if (tb[IFLA_VXLAN_GROUP]) {
 377                 __be32 addr = rta_getattr_u32(tb[IFLA_VXLAN_GROUP]);
 378
 379                 if (addr) {
 380                         if (IN_MULTICAST(ntohl(addr)))
 381                                 fprintf(f, "group %s ",
 382                                         format_host(AF_INET, 4, &addr));
 383                         else
 384                                 fprintf(f, "remote %s ",
 385                                         format_host(AF_INET, 4, &addr));
 386                 }
 387         } else if (tb[IFLA_VXLAN_GROUP6]) {
 388                 struct in6_addr addr;
 389
 390                 memcpy(&addr, RTA_DATA(tb[IFLA_VXLAN_GROUP6]), sizeof(struct in6_addr));
 391                 if (!IN6_IS_ADDR_UNSPECIFIED(&addr)) {
 392                         if (IN6_IS_ADDR_MULTICAST(&addr))
 393                                 fprintf(f, "group %s ",
 394                                         format_host(AF_INET6, sizeof(struct in6_addr), &addr));
 395                         else
 396                                 fprintf(f, "remote %s ",
 397                                         format_host(AF_INET6, sizeof(struct in6_addr), &addr));
 398                 }
 399         }
 400
 401         if (tb[IFLA_VXLAN_LOCAL]) {
 402                 __be32 addr = rta_getattr_u32(tb[IFLA_VXLAN_LOCAL]);
 403
 404                 if (addr)
 405                         fprintf(f, "local %s ",
 406                                 format_host(AF_INET, 4, &addr));
 407         } else if (tb[IFLA_VXLAN_LOCAL6]) {
 408                 struct in6_addr addr;
 409
 410                 memcpy(&addr, RTA_DATA(tb[IFLA_VXLAN_LOCAL6]), sizeof(struct in6_addr));
 411                 if (!IN6_IS_ADDR_UNSPECIFIED(&addr))
 412                         fprintf(f, "local %s ",
 413                                 format_host(AF_INET6, sizeof(struct in6_addr), &addr));
 414         }
 415
 416         if (tb[IFLA_VXLAN_LINK] &&
 417             (link = rta_getattr_u32(tb[IFLA_VXLAN_LINK]))) {
 418                 const char *n = if_indextoname(link, s2);
 419
 420                 if (n)
 421                         fprintf(f, "dev %s ", n);
 422                 else
 423                         fprintf(f, "dev %u ", link);
 424         }
 425
 426         if (tb[IFLA_VXLAN_PORT_RANGE]) {
 427                 const struct ifla_vxlan_port_range *r
 428                         = RTA_DATA(tb[IFLA_VXLAN_PORT_RANGE]);
 429                 fprintf(f, "srcport %u %u ", ntohs(r->low), ntohs(r->high));
 430         }
 431
 432         if (tb[IFLA_VXLAN_PORT])
 433                 fprintf(f, "dstport %u ",
 434                         rta_getattr_be16(tb[IFLA_VXLAN_PORT]));
 435
 436         if (tb[IFLA_VXLAN_LEARNING] &&
 437             !rta_getattr_u8(tb[IFLA_VXLAN_LEARNING]))
 438                 fputs("nolearning ", f);
 439
 440         if (tb[IFLA_VXLAN_PROXY] && rta_getattr_u8(tb[IFLA_VXLAN_PROXY]))
 441                 fputs("proxy ", f);
 442
 443         if (tb[IFLA_VXLAN_RSC] && rta_getattr_u8(tb[IFLA_VXLAN_RSC]))
 444                 fputs("rsc ", f);
 445
 446         if (tb[IFLA_VXLAN_L2MISS] && rta_getattr_u8(tb[IFLA_VXLAN_L2MISS]))
 447                 fputs("l2miss ", f);
 448
 449         if (tb[IFLA_VXLAN_L3MISS] && rta_getattr_u8(tb[IFLA_VXLAN_L3MISS]))
 450                 fputs("l3miss ", f);
 451
 452         if (tb[IFLA_VXLAN_TOS] &&
 453             (tos = rta_getattr_u8(tb[IFLA_VXLAN_TOS]))) {
 454                 if (tos == 1)
 455                         fprintf(f, "tos inherit ");
 456                 else
 457                         fprintf(f, "tos %#x ", tos);
 458         }
 459
 460         if (tb[IFLA_VXLAN_TTL]) {
 461                 __u8 ttl = rta_getattr_u8(tb[IFLA_VXLAN_TTL]);
 462
 463                 if (ttl)
 464                         fprintf(f, "ttl %d ", ttl);
 465         }
 466
 467         if (tb[IFLA_VXLAN_LABEL]) {
 468                 __u32 label = rta_getattr_u32(tb[IFLA_VXLAN_LABEL]);
 469
 470                 if (label)
 471                         fprintf(f, "flowlabel %#x ", ntohl(label));
 472         }
 473
 474         if (tb[IFLA_VXLAN_AGEING]) {
 475                 __u32 age = rta_getattr_u32(tb[IFLA_VXLAN_AGEING]);
 476
 477                 if (age == 0)
 478                         fprintf(f, "ageing none ");
 479                 else
 480                         fprintf(f, "ageing %u ", age);
 481         }
 482
 483         if (tb[IFLA_VXLAN_LIMIT] &&
 484             ((maxaddr = rta_getattr_u32(tb[IFLA_VXLAN_LIMIT])) != 0))
 485                     fprintf(f, "maxaddr %u ", maxaddr);
 486
 487         if (tb[IFLA_VXLAN_UDP_CSUM]) {
 488                 if (!rta_getattr_u8(tb[IFLA_VXLAN_UDP_CSUM]))
 489                         fputs("no", f);
 490                 fputs("udpcsum ", f);
 491         }
 492
 493         if (tb[IFLA_VXLAN_UDP_ZERO_CSUM6_TX]) {
 494                 if (!rta_getattr_u8(tb[IFLA_VXLAN_UDP_ZERO_CSUM6_TX]))
 495                         fputs("no", f);
 496                 fputs("udp6zerocsumtx ", f);
 497         }
 498
 499         if (tb[IFLA_VXLAN_UDP_ZERO_CSUM6_RX]) {
 500                 if (!rta_getattr_u8(tb[IFLA_VXLAN_UDP_ZERO_CSUM6_RX]))
 501                         fputs("no", f);
 502                 fputs("udp6zerocsumrx ", f);
 503         }
 504
 505         if (tb[IFLA_VXLAN_REMCSUM_TX] &&
 506             rta_getattr_u8(tb[IFLA_VXLAN_REMCSUM_TX]))
 507                 fputs("remcsumtx ", f);
 508
 509         if (tb[IFLA_VXLAN_REMCSUM_RX] &&
 510             rta_getattr_u8(tb[IFLA_VXLAN_REMCSUM_RX]))
 511                 fputs("remcsumrx ", f);
 512
 513         if (tb[IFLA_VXLAN_COLLECT_METADATA] &&
 514             rta_getattr_u8(tb[IFLA_VXLAN_COLLECT_METADATA]))
 515                 fputs("external ", f);
 516
 517         if (tb[IFLA_VXLAN_GBP])
 518                 fputs("gbp ", f);
 519         if (tb[IFLA_VXLAN_GPE])
 520                 fputs("gpe ", f);
 521 }
 522
 523 static void vxlan_print_help(struct link_util *lu, int argc, char **argv,
 524         FILE *f)
 525 {
 526         print_explain(f);
 527 }
 528
 529 struct link_util vxlan_link_util = {
 530         .id             = "vxlan",
 531         .maxattr        = IFLA_VXLAN_MAX,
 532         .parse_opt      = vxlan_parse_opt,
 533         .print_opt      = vxlan_print_opt,
 534         .print_help     = vxlan_print_help,
 535 };