ip/link_gre.c

   1 /*
   2  * link_gre.c   gre driver module
   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:     Herbert Xu <herbert@gondor.apana.org.au>
  10  *
  11  */
  12
  13 #include <string.h>
  14 #include <net/if.h>
  15 #include <sys/types.h>
  16 #include <sys/socket.h>
  17 #include <arpa/inet.h>
  18
  19 #include <linux/ip.h>
  20 #include <linux/if_tunnel.h>
  21 #include "rt_names.h"
  22 #include "utils.h"
  23 #include "ip_common.h"
  24 #include "tunnel.h"
  25
  26 static void print_usage(FILE *f)
  27 {
  28         fprintf(f,
  29                 "Usage: ... { gre | gretap | erspan } [ remote ADDR ]\n"
  30                 "                            [ local ADDR ]\n"
  31                 "                            [ [i|o]seq ]\n"
  32                 "                            [ [i|o]key KEY ]\n"
  33                 "                            [ [i|o]csum ]\n"
  34                 "                            [ ttl TTL ]\n"
  35                 "                            [ tos TOS ]\n"
  36                 "                            [ [no]pmtudisc ]\n"
  37                 "                            [ [no]ignore-df ]\n"
  38                 "                            [ dev PHYS_DEV ]\n"
  39                 "                            [ noencap ]\n"
  40                 "                            [ encap { fou | gue | none } ]\n"
  41                 "                            [ encap-sport PORT ]\n"
  42                 "                            [ encap-dport PORT ]\n"
  43                 "                            [ [no]encap-csum ]\n"
  44                 "                            [ [no]encap-csum6 ]\n"
  45                 "                            [ [no]encap-remcsum ]\n"
  46                 "                            [ external ]\n"
  47                 "                            [ fwmark MARK ]\n"
  48                 "                            [ erspan_ver version ]\n"
  49                 "                            [ erspan IDX ]\n"
  50                 "                            [ erspan_dir { ingress | egress } ]\n"
  51                 "                            [ erspan_hwid hwid ]\n"
  52                 "                            [ external ]\n"
  53                 "\n"
  54                 "Where: ADDR := { IP_ADDRESS | any }\n"
  55                 "       TOS  := { NUMBER | inherit }\n"
  56                 "       TTL  := { 1..255 | inherit }\n"
  57                 "       KEY  := { DOTTED_QUAD | NUMBER }\n"
  58                 "       MARK := { 0x0..0xffffffff }\n"
  59         );
  60 }
  61
  62 static void usage(void) __attribute__((noreturn));
  63 static void usage(void)
  64 {
  65         print_usage(stderr);
  66         exit(-1);
  67 }
  68
  69 static int gre_parse_opt(struct link_util *lu, int argc, char **argv,
  70                          struct nlmsghdr *n)
  71 {
  72         struct ifinfomsg *ifi = (struct ifinfomsg *)(n + 1);
  73         struct {
  74                 struct nlmsghdr n;
  75                 struct ifinfomsg i;
  76         } req = {
  77                 .n.nlmsg_len = NLMSG_LENGTH(sizeof(*ifi)),
  78                 .n.nlmsg_flags = NLM_F_REQUEST,
  79                 .n.nlmsg_type = RTM_GETLINK,
  80                 .i.ifi_family = preferred_family,
  81                 .i.ifi_index = ifi->ifi_index,
  82         };
  83         struct nlmsghdr *answer;
  84         struct rtattr *tb[IFLA_MAX + 1];
  85         struct rtattr *linkinfo[IFLA_INFO_MAX+1];
  86         struct rtattr *greinfo[IFLA_GRE_MAX + 1];
  87         __u16 iflags = 0;
  88         __u16 oflags = 0;
  89         __be32 ikey = 0;
  90         __be32 okey = 0;
  91         unsigned int saddr = 0;
  92         unsigned int daddr = 0;
  93         unsigned int link = 0;
  94         __u8 pmtudisc = 1;
  95         __u8 ttl = 0;
  96         __u8 tos = 0;
  97         int len;
  98         __u16 encaptype = 0;
  99         __u16 encapflags = 0;
 100         __u16 encapsport = 0;
 101         __u16 encapdport = 0;
 102         __u8 metadata = 0;
 103         __u8 ignore_df = 0;
 104         __u32 fwmark = 0;
 105         __u32 erspan_idx = 0;
 106         __u8 erspan_ver = 0;
 107         __u8 erspan_dir = 0;
 108         __u16 erspan_hwid = 0;
 109
 110         if (!(n->nlmsg_flags & NLM_F_CREATE)) {
 111                 if (rtnl_talk(&rth, &req.n, &answer) < 0) {
 112 get_failed:
 113                         fprintf(stderr,
 114                                 "Failed to get existing tunnel info.\n");
 115                         return -1;
 116                 }
 117
 118                 len = answer->nlmsg_len;
 119                 len -= NLMSG_LENGTH(sizeof(*ifi));
 120                 if (len < 0)
 121                         goto get_failed;
 122
 123                 parse_rtattr(tb, IFLA_MAX, IFLA_RTA(NLMSG_DATA(answer)), len);
 124
 125                 if (!tb[IFLA_LINKINFO])
 126                         goto get_failed;
 127
 128                 parse_rtattr_nested(linkinfo, IFLA_INFO_MAX, tb[IFLA_LINKINFO]);
 129
 130                 if (!linkinfo[IFLA_INFO_DATA])
 131                         goto get_failed;
 132
 133                 parse_rtattr_nested(greinfo, IFLA_GRE_MAX,
 134                                     linkinfo[IFLA_INFO_DATA]);
 135
 136                 if (greinfo[IFLA_GRE_IKEY])
 137                         ikey = rta_getattr_u32(greinfo[IFLA_GRE_IKEY]);
 138
 139                 if (greinfo[IFLA_GRE_OKEY])
 140                         okey = rta_getattr_u32(greinfo[IFLA_GRE_OKEY]);
 141
 142                 if (greinfo[IFLA_GRE_IFLAGS])
 143                         iflags = rta_getattr_u16(greinfo[IFLA_GRE_IFLAGS]);
 144
 145                 if (greinfo[IFLA_GRE_OFLAGS])
 146                         oflags = rta_getattr_u16(greinfo[IFLA_GRE_OFLAGS]);
 147
 148                 if (greinfo[IFLA_GRE_LOCAL])
 149                         saddr = rta_getattr_u32(greinfo[IFLA_GRE_LOCAL]);
 150
 151                 if (greinfo[IFLA_GRE_REMOTE])
 152                         daddr = rta_getattr_u32(greinfo[IFLA_GRE_REMOTE]);
 153
 154                 if (greinfo[IFLA_GRE_PMTUDISC])
 155                         pmtudisc = rta_getattr_u8(
 156                                 greinfo[IFLA_GRE_PMTUDISC]);
 157
 158                 if (greinfo[IFLA_GRE_TTL])
 159                         ttl = rta_getattr_u8(greinfo[IFLA_GRE_TTL]);
 160
 161                 if (greinfo[IFLA_GRE_TOS])
 162                         tos = rta_getattr_u8(greinfo[IFLA_GRE_TOS]);
 163
 164                 if (greinfo[IFLA_GRE_LINK])
 165                         link = rta_getattr_u32(greinfo[IFLA_GRE_LINK]);
 166
 167                 if (greinfo[IFLA_GRE_ENCAP_TYPE])
 168                         encaptype = rta_getattr_u16(greinfo[IFLA_GRE_ENCAP_TYPE]);
 169                 if (greinfo[IFLA_GRE_ENCAP_FLAGS])
 170                         encapflags = rta_getattr_u16(greinfo[IFLA_GRE_ENCAP_FLAGS]);
 171                 if (greinfo[IFLA_GRE_ENCAP_SPORT])
 172                         encapsport = rta_getattr_u16(greinfo[IFLA_GRE_ENCAP_SPORT]);
 173                 if (greinfo[IFLA_GRE_ENCAP_DPORT])
 174                         encapdport = rta_getattr_u16(greinfo[IFLA_GRE_ENCAP_DPORT]);
 175
 176                 if (greinfo[IFLA_GRE_COLLECT_METADATA])
 177                         metadata = 1;
 178
 179                 if (greinfo[IFLA_GRE_IGNORE_DF])
 180                         ignore_df =
 181                                 !!rta_getattr_u8(greinfo[IFLA_GRE_IGNORE_DF]);
 182
 183                 if (greinfo[IFLA_GRE_FWMARK])
 184                         fwmark = rta_getattr_u32(greinfo[IFLA_GRE_FWMARK]);
 185
 186                 if (greinfo[IFLA_GRE_ERSPAN_INDEX])
 187                         erspan_idx = rta_getattr_u32(greinfo[IFLA_GRE_ERSPAN_INDEX]);
 188
 189                 if (greinfo[IFLA_GRE_ERSPAN_VER])
 190                         erspan_ver = rta_getattr_u8(greinfo[IFLA_GRE_ERSPAN_VER]);
 191
 192                 if (greinfo[IFLA_GRE_ERSPAN_DIR])
 193                         erspan_dir = rta_getattr_u8(greinfo[IFLA_GRE_ERSPAN_DIR]);
 194
 195                 if (greinfo[IFLA_GRE_ERSPAN_HWID])
 196                         erspan_hwid = rta_getattr_u16(greinfo[IFLA_GRE_ERSPAN_HWID]);
 197
 198                 free(answer);
 199         }
 200
 201         while (argc > 0) {
 202                 if (!matches(*argv, "key")) {
 203                         NEXT_ARG();
 204                         iflags |= GRE_KEY;
 205                         oflags |= GRE_KEY;
 206                         ikey = okey = tnl_parse_key("key", *argv);
 207                 } else if (!matches(*argv, "ikey")) {
 208                         NEXT_ARG();
 209                         iflags |= GRE_KEY;
 210                         ikey = tnl_parse_key("ikey", *argv);
 211                 } else if (!matches(*argv, "okey")) {
 212                         NEXT_ARG();
 213                         oflags |= GRE_KEY;
 214                         okey = tnl_parse_key("okey", *argv);
 215                 } else if (!matches(*argv, "seq")) {
 216                         iflags |= GRE_SEQ;
 217                         oflags |= GRE_SEQ;
 218                 } else if (!matches(*argv, "iseq")) {
 219                         iflags |= GRE_SEQ;
 220                 } else if (!matches(*argv, "oseq")) {
 221                         oflags |= GRE_SEQ;
 222                 } else if (!matches(*argv, "csum")) {
 223                         iflags |= GRE_CSUM;
 224                         oflags |= GRE_CSUM;
 225                 } else if (!matches(*argv, "icsum")) {
 226                         iflags |= GRE_CSUM;
 227                 } else if (!matches(*argv, "ocsum")) {
 228                         oflags |= GRE_CSUM;
 229                 } else if (!matches(*argv, "nopmtudisc")) {
 230                         pmtudisc = 0;
 231                 } else if (!matches(*argv, "pmtudisc")) {
 232                         pmtudisc = 1;
 233                 } else if (!matches(*argv, "remote")) {
 234                         NEXT_ARG();
 235                         daddr = get_addr32(*argv);
 236                 } else if (!matches(*argv, "local")) {
 237                         NEXT_ARG();
 238                         saddr = get_addr32(*argv);
 239                 } else if (!matches(*argv, "dev")) {
 240                         NEXT_ARG();
 241                         link = ll_name_to_index(*argv);
 242                         if (link == 0) {
 243                                 fprintf(stderr, "Cannot find device \"%s\"\n",
 244                                         *argv);
 245                                 exit(-1);
 246                         }
 247                 } else if (!matches(*argv, "ttl") ||
 248                            !matches(*argv, "hoplimit") ||
 249                            !matches(*argv, "hlim")) {
 250                         NEXT_ARG();
 251                         if (strcmp(*argv, "inherit") != 0) {
 252                                 if (get_u8(&ttl, *argv, 0))
 253                                         invarg("invalid TTL\n", *argv);
 254                         } else
 255                                 ttl = 0;
 256                 } else if (!matches(*argv, "tos") ||
 257                            !matches(*argv, "tclass") ||
 258                            !matches(*argv, "dsfield")) {
 259                         __u32 uval;
 260
 261                         NEXT_ARG();
 262                         if (strcmp(*argv, "inherit") != 0) {
 263                                 if (rtnl_dsfield_a2n(&uval, *argv))
 264                                         invarg("bad TOS value", *argv);
 265                                 tos = uval;
 266                         } else
 267                                 tos = 1;
 268                 } else if (strcmp(*argv, "noencap") == 0) {
 269                         encaptype = TUNNEL_ENCAP_NONE;
 270                 } else if (strcmp(*argv, "encap") == 0) {
 271                         NEXT_ARG();
 272                         if (strcmp(*argv, "fou") == 0)
 273                                 encaptype = TUNNEL_ENCAP_FOU;
 274                         else if (strcmp(*argv, "gue") == 0)
 275                                 encaptype = TUNNEL_ENCAP_GUE;
 276                         else if (strcmp(*argv, "none") == 0)
 277                                 encaptype = TUNNEL_ENCAP_NONE;
 278                         else
 279                                 invarg("Invalid encap type.", *argv);
 280                 } else if (strcmp(*argv, "encap-sport") == 0) {
 281                         NEXT_ARG();
 282                         if (strcmp(*argv, "auto") == 0)
 283                                 encapsport = 0;
 284                         else if (get_u16(&encapsport, *argv, 0))
 285                                 invarg("Invalid source port.", *argv);
 286                 } else if (strcmp(*argv, "encap-dport") == 0) {
 287                         NEXT_ARG();
 288                         if (get_u16(&encapdport, *argv, 0))
 289                                 invarg("Invalid destination port.", *argv);
 290                 } else if (strcmp(*argv, "encap-csum") == 0) {
 291                         encapflags |= TUNNEL_ENCAP_FLAG_CSUM;
 292                 } else if (strcmp(*argv, "noencap-csum") == 0) {
 293                         encapflags &= ~TUNNEL_ENCAP_FLAG_CSUM;
 294                 } else if (strcmp(*argv, "encap-udp6-csum") == 0) {
 295                         encapflags |= TUNNEL_ENCAP_FLAG_CSUM6;
 296                 } else if (strcmp(*argv, "noencap-udp6-csum") == 0) {
 297                         encapflags &= ~TUNNEL_ENCAP_FLAG_CSUM6;
 298                 } else if (strcmp(*argv, "encap-remcsum") == 0) {
 299                         encapflags |= TUNNEL_ENCAP_FLAG_REMCSUM;
 300                 } else if (strcmp(*argv, "noencap-remcsum") == 0) {
 301                         encapflags &= ~TUNNEL_ENCAP_FLAG_REMCSUM;
 302                 } else if (strcmp(*argv, "external") == 0) {
 303                         metadata = 1;
 304                 } else if (strcmp(*argv, "ignore-df") == 0) {
 305                         ignore_df = 1;
 306                 } else if (strcmp(*argv, "noignore-df") == 0) {
 307                         /*
 308                          *only the lsb is significant, use 2 for presence
 309                          */
 310                         ignore_df = 2;
 311                 } else if (strcmp(*argv, "fwmark") == 0) {
 312                         NEXT_ARG();
 313                         if (get_u32(&fwmark, *argv, 0))
 314                                 invarg("invalid fwmark\n", *argv);
 315                 } else if (strcmp(*argv, "erspan") == 0) {
 316                         NEXT_ARG();
 317                         if (get_u32(&erspan_idx, *argv, 0))
 318                                 invarg("invalid erspan index\n", *argv);
 319                         if (erspan_idx & ~((1<<20) - 1) || erspan_idx == 0)
 320                                 invarg("erspan index must be > 0 and <= 20-bit\n", *argv);
 321                 } else if (strcmp(*argv, "erspan_ver") == 0) {
 322                         NEXT_ARG();
 323                         if (get_u8(&erspan_ver, *argv, 0))
 324                                 invarg("invalid erspan version\n", *argv);
 325                         if (erspan_ver != 1 && erspan_ver != 2)
 326                                 invarg("erspan version must be 1 or 2\n", *argv);
 327                 } else if (strcmp(*argv, "erspan_dir") == 0) {
 328                         NEXT_ARG();
 329                         if (matches(*argv, "ingress") == 0)
 330                                 erspan_dir = 0;
 331                         else if (matches(*argv, "egress") == 0)
 332                                 erspan_dir = 1;
 333                         else
 334                                 invarg("Invalid erspan direction.", *argv);
 335                 } else if (strcmp(*argv, "erspan_hwid") == 0) {
 336                         NEXT_ARG();
 337                         if (get_u16(&erspan_hwid, *argv, 0))
 338                                 invarg("invalid erspan hwid\n", *argv);
 339                 } else
 340                         usage();
 341                 argc--; argv++;
 342         }
 343
 344         if (!ikey && IN_MULTICAST(ntohl(daddr))) {
 345                 ikey = daddr;
 346                 iflags |= GRE_KEY;
 347         }
 348         if (!okey && IN_MULTICAST(ntohl(daddr))) {
 349                 okey = daddr;
 350                 oflags |= GRE_KEY;
 351         }
 352         if (IN_MULTICAST(ntohl(daddr)) && !saddr) {
 353                 fprintf(stderr, "A broadcast tunnel requires a source address.\n");
 354                 return -1;
 355         }
 356
 357         if (!metadata) {
 358                 addattr32(n, 1024, IFLA_GRE_IKEY, ikey);
 359                 addattr32(n, 1024, IFLA_GRE_OKEY, okey);
 360                 addattr_l(n, 1024, IFLA_GRE_IFLAGS, &iflags, 2);
 361                 addattr_l(n, 1024, IFLA_GRE_OFLAGS, &oflags, 2);
 362                 addattr_l(n, 1024, IFLA_GRE_LOCAL, &saddr, 4);
 363                 addattr_l(n, 1024, IFLA_GRE_REMOTE, &daddr, 4);
 364                 addattr_l(n, 1024, IFLA_GRE_PMTUDISC, &pmtudisc, 1);
 365                 if (ignore_df)
 366                         addattr8(n, 1024, IFLA_GRE_IGNORE_DF, ignore_df & 1);
 367                 if (link)
 368                         addattr32(n, 1024, IFLA_GRE_LINK, link);
 369                 addattr_l(n, 1024, IFLA_GRE_TTL, &ttl, 1);
 370                 addattr_l(n, 1024, IFLA_GRE_TOS, &tos, 1);
 371                 addattr32(n, 1024, IFLA_GRE_FWMARK, fwmark);
 372                 if (erspan_ver) {
 373                         addattr8(n, 1024, IFLA_GRE_ERSPAN_VER, erspan_ver);
 374                         if (erspan_ver == 1 && erspan_idx != 0) {
 375                                 addattr32(n, 1024,
 376                                           IFLA_GRE_ERSPAN_INDEX, erspan_idx);
 377                         } else if (erspan_ver == 2) {
 378                                 addattr8(n, 1024,
 379                                          IFLA_GRE_ERSPAN_DIR, erspan_dir);
 380                                 addattr16(n, 1024,
 381                                           IFLA_GRE_ERSPAN_HWID, erspan_hwid);
 382                         }
 383                 }
 384                 addattr16(n, 1024, IFLA_GRE_ENCAP_TYPE, encaptype);
 385                 addattr16(n, 1024, IFLA_GRE_ENCAP_FLAGS, encapflags);
 386                 addattr16(n, 1024, IFLA_GRE_ENCAP_SPORT, htons(encapsport));
 387                 addattr16(n, 1024, IFLA_GRE_ENCAP_DPORT, htons(encapdport));
 388         } else {
 389                 addattr_l(n, 1024, IFLA_GRE_COLLECT_METADATA, NULL, 0);
 390         }
 391
 392         return 0;
 393 }
 394
 395 static void gre_print_opt(struct link_util *lu, FILE *f, struct rtattr *tb[])
 396 {
 397         char s2[64];
 398         unsigned int iflags = 0;
 399         unsigned int oflags = 0;
 400         __u8 ttl = 0;
 401         __u8 tos = 0;
 402
 403         if (!tb)
 404                 return;
 405
 406         if (tb[IFLA_GRE_COLLECT_METADATA]) {
 407                 print_bool(PRINT_ANY, "external", "external", true);
 408                 return;
 409         }
 410
 411         tnl_print_endpoint("remote", tb[IFLA_GRE_REMOTE], AF_INET);
 412         tnl_print_endpoint("local", tb[IFLA_GRE_LOCAL], AF_INET);
 413
 414         if (tb[IFLA_GRE_LINK]) {
 415                 unsigned int link = rta_getattr_u32(tb[IFLA_GRE_LINK]);
 416
 417                 if (link) {
 418                         print_string(PRINT_ANY, "link", "dev %s ",
 419                                      ll_index_to_name(link));
 420                 }
 421         }
 422
 423         if (tb[IFLA_GRE_TTL])
 424                 ttl = rta_getattr_u8(tb[IFLA_GRE_TTL]);
 425         if (is_json_context() || ttl)
 426                 print_uint(PRINT_ANY, "ttl", "ttl %u ", ttl);
 427         else
 428                 print_string(PRINT_FP, NULL, "ttl %s ", "inherit");
 429
 430         if (tb[IFLA_GRE_TOS])
 431                 tos = rta_getattr_u8(tb[IFLA_GRE_TOS]);
 432         if (tos) {
 433                 if (is_json_context() || tos != 1)
 434                         print_0xhex(PRINT_ANY, "tos", "tos 0x%x ", tos);
 435                 else
 436                         print_string(PRINT_FP, NULL, "tos %s ", "inherit");
 437         }
 438
 439         if (tb[IFLA_GRE_PMTUDISC]) {
 440                 if (!rta_getattr_u8(tb[IFLA_GRE_PMTUDISC]))
 441                         print_bool(PRINT_ANY, "pmtudisc", "nopmtudisc ", false);
 442                 else
 443                         print_bool(PRINT_JSON, "pmtudisc", NULL, true);
 444         }
 445
 446         if (tb[IFLA_GRE_IGNORE_DF] && rta_getattr_u8(tb[IFLA_GRE_IGNORE_DF]))
 447                 print_bool(PRINT_ANY, "ignore_df", "ignore-df ", true);
 448
 449         if (tb[IFLA_GRE_IFLAGS])
 450                 iflags = rta_getattr_u16(tb[IFLA_GRE_IFLAGS]);
 451
 452         if (tb[IFLA_GRE_OFLAGS])
 453                 oflags = rta_getattr_u16(tb[IFLA_GRE_OFLAGS]);
 454
 455         if ((iflags & GRE_KEY) && tb[IFLA_GRE_IKEY]) {
 456                 inet_ntop(AF_INET, RTA_DATA(tb[IFLA_GRE_IKEY]), s2, sizeof(s2));
 457                 print_string(PRINT_ANY, "ikey", "ikey %s ", s2);
 458         }
 459
 460         if ((oflags & GRE_KEY) && tb[IFLA_GRE_OKEY]) {
 461                 inet_ntop(AF_INET, RTA_DATA(tb[IFLA_GRE_OKEY]), s2, sizeof(s2));
 462                 print_string(PRINT_ANY, "okey", "okey %s ", s2);
 463         }
 464
 465         if (iflags & GRE_SEQ)
 466                 print_bool(PRINT_ANY, "iseq", "iseq ", true);
 467         if (oflags & GRE_SEQ)
 468                 print_bool(PRINT_ANY, "oseq", "oseq ", true);
 469         if (iflags & GRE_CSUM)
 470                 print_bool(PRINT_ANY, "icsum", "icsum ", true);
 471         if (oflags & GRE_CSUM)
 472                 print_bool(PRINT_ANY, "ocsum", "ocsum ", true);
 473
 474         if (tb[IFLA_GRE_FWMARK]) {
 475                 __u32 fwmark = rta_getattr_u32(tb[IFLA_GRE_FWMARK]);
 476
 477                 if (fwmark) {
 478                         print_0xhex(PRINT_ANY,
 479                                     "fwmark", "fwmark 0x%x ", fwmark);
 480                 }
 481         }
 482
 483         if (tb[IFLA_GRE_ERSPAN_INDEX]) {
 484                 __u32 erspan_idx = rta_getattr_u32(tb[IFLA_GRE_ERSPAN_INDEX]);
 485
 486                 print_uint(PRINT_ANY,
 487                            "erspan_index", "erspan_index %u ", erspan_idx);
 488         }
 489
 490         if (tb[IFLA_GRE_ERSPAN_VER]) {
 491                 __u8 erspan_ver = rta_getattr_u8(tb[IFLA_GRE_ERSPAN_VER]);
 492
 493                 print_uint(PRINT_ANY, "erspan_ver", "erspan_ver %u ", erspan_ver);
 494         }
 495
 496         if (tb[IFLA_GRE_ERSPAN_DIR]) {
 497                 __u8 erspan_dir = rta_getattr_u8(tb[IFLA_GRE_ERSPAN_DIR]);
 498
 499                 if (erspan_dir == 0)
 500                         print_string(PRINT_ANY, "erspan_dir",
 501                                      "erspan_dir ingress ", NULL);
 502                 else
 503                         print_string(PRINT_ANY, "erspan_dir",
 504                                      "erspan_dir egress ", NULL);
 505         }
 506
 507         if (tb[IFLA_GRE_ERSPAN_HWID]) {
 508                 __u16 erspan_hwid = rta_getattr_u16(tb[IFLA_GRE_ERSPAN_HWID]);
 509
 510                 print_hex(PRINT_ANY, "erspan_hwid", "erspan_hwid 0x%x ", erspan_hwid);
 511         }
 512
 513         tnl_print_encap(tb,
 514                         IFLA_GRE_ENCAP_TYPE,
 515                         IFLA_GRE_ENCAP_FLAGS,
 516                         IFLA_GRE_ENCAP_SPORT,
 517                         IFLA_GRE_ENCAP_DPORT);
 518 }
 519
 520 static void gre_print_help(struct link_util *lu, int argc, char **argv,
 521                            FILE *f)
 522 {
 523         print_usage(f);
 524 }
 525
 526 struct link_util gre_link_util = {
 527         .id = "gre",
 528         .maxattr = IFLA_GRE_MAX,
 529         .parse_opt = gre_parse_opt,
 530         .print_opt = gre_print_opt,
 531         .print_help = gre_print_help,
 532 };
 533
 534 struct link_util gretap_link_util = {
 535         .id = "gretap",
 536         .maxattr = IFLA_GRE_MAX,
 537         .parse_opt = gre_parse_opt,
 538         .print_opt = gre_print_opt,
 539         .print_help = gre_print_help,
 540 };
 541
 542 struct link_util erspan_link_util = {
 543         .id = "erspan",
 544         .maxattr = IFLA_GRE_MAX,
 545         .parse_opt = gre_parse_opt,
 546         .print_opt = gre_print_opt,
 547         .print_help = gre_print_help,
 548 };