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 gre_print_help(struct link_util *lu, int argc, char **argv, FILE *f)
  27 {
  28         fprintf(f,
  29                 "Usage: ... %-9s [ remote ADDR ]\n",
  30                 lu->id
  31         );
  32         fprintf(f,
  33                 "                     [ local ADDR ]\n"
  34                 "                     [ [i|o]seq ]\n"
  35                 "                     [ [i|o]key KEY ]\n"
  36                 "                     [ [i|o]csum ]\n"
  37                 "                     [ ttl TTL ]\n"
  38                 "                     [ tos TOS ]\n"
  39                 "                     [ [no]pmtudisc ]\n"
  40                 "                     [ [no]ignore-df ]\n"
  41                 "                     [ dev PHYS_DEV ]\n"
  42                 "                     [ fwmark MARK ]\n"
  43                 "                     [ external ]\n"
  44                 "                     [ noencap ]\n"
  45                 "                     [ encap { fou | gue | none } ]\n"
  46                 "                     [ encap-sport PORT ]\n"
  47                 "                     [ encap-dport PORT ]\n"
  48                 "                     [ [no]encap-csum ]\n"
  49                 "                     [ [no]encap-csum6 ]\n"
  50                 "                     [ [no]encap-remcsum ]\n"
  51                 "                     [ erspan_ver version ]\n"
  52                 "                     [ erspan IDX ]\n"
  53                 "                     [ erspan_dir { ingress | egress } ]\n"
  54                 "                     [ erspan_hwid hwid ]\n"
  55                 "\n"
  56         );
  57         fprintf(f,
  58                 "Where: ADDR := { IP_ADDRESS | any }\n"
  59                 "       TOS  := { NUMBER | inherit }\n"
  60                 "       TTL  := { 1..255 | inherit }\n"
  61                 "       KEY  := { DOTTED_QUAD | NUMBER }\n"
  62                 "       MARK := { 0x0..0xffffffff }\n"
  63         );
  64 }
  65
  66 static int gre_parse_opt(struct link_util *lu, int argc, char **argv,
  67                          struct nlmsghdr *n)
  68 {
  69         struct ifinfomsg *ifi = NLMSG_DATA(n);
  70         struct {
  71                 struct nlmsghdr n;
  72                 struct ifinfomsg i;
  73         } req = {
  74                 .n.nlmsg_len = NLMSG_LENGTH(sizeof(*ifi)),
  75                 .n.nlmsg_flags = NLM_F_REQUEST,
  76                 .n.nlmsg_type = RTM_GETLINK,
  77                 .i.ifi_family = preferred_family,
  78                 .i.ifi_index = ifi->ifi_index,
  79         };
  80         struct nlmsghdr *answer;
  81         struct rtattr *tb[IFLA_MAX + 1];
  82         struct rtattr *linkinfo[IFLA_INFO_MAX+1];
  83         struct rtattr *greinfo[IFLA_GRE_MAX + 1];
  84         int len;
  85         __u16 iflags = 0;
  86         __u16 oflags = 0;
  87         __be32 ikey = 0;
  88         __be32 okey = 0;
  89         inet_prefix saddr, daddr;
  90         __u8 pmtudisc = 1;
  91         __u8 ignore_df = 0;
  92         __u8 tos = 0;
  93         __u8 ttl = 0;
  94         __u32 link = 0;
  95         __u16 encaptype = 0;
  96         __u16 encapflags = 0;
  97         __u16 encapsport = 0;
  98         __u16 encapdport = 0;
  99         __u8 metadata = 0;
 100         __u32 fwmark = 0;
 101         __u32 erspan_idx = 0;
 102         __u8 erspan_ver = 0;
 103         __u8 erspan_dir = 0;
 104         __u16 erspan_hwid = 0;
 105
 106         inet_prefix_reset(&saddr);
 107         inet_prefix_reset(&daddr);
 108
 109         if (!(n->nlmsg_flags & NLM_F_CREATE)) {
 110                 const struct rtattr *rta;
 111
 112                 if (rtnl_talk(&rth, &req.n, &answer) < 0) {
 113 get_failed:
 114                         fprintf(stderr,
 115                                 "Failed to get existing tunnel info.\n");
 116                         return -1;
 117                 }
 118
 119                 len = answer->nlmsg_len;
 120                 len -= NLMSG_LENGTH(sizeof(*ifi));
 121                 if (len < 0)
 122                         goto get_failed;
 123
 124                 parse_rtattr(tb, IFLA_MAX, IFLA_RTA(NLMSG_DATA(answer)), len);
 125
 126                 if (!tb[IFLA_LINKINFO])
 127                         goto get_failed;
 128
 129                 parse_rtattr_nested(linkinfo, IFLA_INFO_MAX, tb[IFLA_LINKINFO]);
 130
 131                 if (!linkinfo[IFLA_INFO_DATA])
 132                         goto get_failed;
 133
 134                 parse_rtattr_nested(greinfo, IFLA_GRE_MAX,
 135                                     linkinfo[IFLA_INFO_DATA]);
 136
 137                 rta = greinfo[IFLA_GRE_LOCAL];
 138                 if (rta && get_addr_rta(&saddr, rta, AF_INET))
 139                         goto get_failed;
 140
 141                 rta = greinfo[IFLA_GRE_REMOTE];
 142                 if (rta && get_addr_rta(&daddr, rta, AF_INET))
 143                         goto get_failed;
 144
 145                 if (greinfo[IFLA_GRE_IKEY])
 146                         ikey = rta_getattr_u32(greinfo[IFLA_GRE_IKEY]);
 147
 148                 if (greinfo[IFLA_GRE_OKEY])
 149                         okey = rta_getattr_u32(greinfo[IFLA_GRE_OKEY]);
 150
 151                 if (greinfo[IFLA_GRE_IFLAGS])
 152                         iflags = rta_getattr_u16(greinfo[IFLA_GRE_IFLAGS]);
 153
 154                 if (greinfo[IFLA_GRE_OFLAGS])
 155                         oflags = rta_getattr_u16(greinfo[IFLA_GRE_OFLAGS]);
 156
 157                 if (greinfo[IFLA_GRE_PMTUDISC])
 158                         pmtudisc = rta_getattr_u8(
 159                                 greinfo[IFLA_GRE_PMTUDISC]);
 160
 161                 if (greinfo[IFLA_GRE_IGNORE_DF])
 162                         ignore_df =
 163                                 !!rta_getattr_u8(greinfo[IFLA_GRE_IGNORE_DF]);
 164
 165                 if (greinfo[IFLA_GRE_TOS])
 166                         tos = rta_getattr_u8(greinfo[IFLA_GRE_TOS]);
 167
 168                 if (greinfo[IFLA_GRE_TTL])
 169                         ttl = rta_getattr_u8(greinfo[IFLA_GRE_TTL]);
 170
 171                 if (greinfo[IFLA_GRE_LINK])
 172                         link = rta_getattr_u32(greinfo[IFLA_GRE_LINK]);
 173
 174                 if (greinfo[IFLA_GRE_ENCAP_TYPE])
 175                         encaptype = rta_getattr_u16(greinfo[IFLA_GRE_ENCAP_TYPE]);
 176
 177                 if (greinfo[IFLA_GRE_ENCAP_FLAGS])
 178                         encapflags = rta_getattr_u16(greinfo[IFLA_GRE_ENCAP_FLAGS]);
 179
 180                 if (greinfo[IFLA_GRE_ENCAP_SPORT])
 181                         encapsport = rta_getattr_u16(greinfo[IFLA_GRE_ENCAP_SPORT]);
 182
 183                 if (greinfo[IFLA_GRE_ENCAP_DPORT])
 184                         encapdport = rta_getattr_u16(greinfo[IFLA_GRE_ENCAP_DPORT]);
 185
 186                 if (greinfo[IFLA_GRE_COLLECT_METADATA])
 187                         metadata = 1;
 188
 189                 if (greinfo[IFLA_GRE_FWMARK])
 190                         fwmark = rta_getattr_u32(greinfo[IFLA_GRE_FWMARK]);
 191
 192                 if (greinfo[IFLA_GRE_ERSPAN_INDEX])
 193                         erspan_idx = rta_getattr_u32(greinfo[IFLA_GRE_ERSPAN_INDEX]);
 194
 195                 if (greinfo[IFLA_GRE_ERSPAN_VER])
 196                         erspan_ver = rta_getattr_u8(greinfo[IFLA_GRE_ERSPAN_VER]);
 197
 198                 if (greinfo[IFLA_GRE_ERSPAN_DIR])
 199                         erspan_dir = rta_getattr_u8(greinfo[IFLA_GRE_ERSPAN_DIR]);
 200
 201                 if (greinfo[IFLA_GRE_ERSPAN_HWID])
 202                         erspan_hwid = rta_getattr_u16(greinfo[IFLA_GRE_ERSPAN_HWID]);
 203
 204                 free(answer);
 205         }
 206
 207         while (argc > 0) {
 208                 if (!matches(*argv, "key")) {
 209                         NEXT_ARG();
 210                         iflags |= GRE_KEY;
 211                         oflags |= GRE_KEY;
 212                         ikey = okey = tnl_parse_key("key", *argv);
 213                 } else if (!matches(*argv, "ikey")) {
 214                         NEXT_ARG();
 215                         iflags |= GRE_KEY;
 216                         ikey = tnl_parse_key("ikey", *argv);
 217                 } else if (!matches(*argv, "okey")) {
 218                         NEXT_ARG();
 219                         oflags |= GRE_KEY;
 220                         okey = tnl_parse_key("okey", *argv);
 221                 } else if (!matches(*argv, "seq")) {
 222                         iflags |= GRE_SEQ;
 223                         oflags |= GRE_SEQ;
 224                 } else if (!matches(*argv, "iseq")) {
 225                         iflags |= GRE_SEQ;
 226                 } else if (!matches(*argv, "oseq")) {
 227                         oflags |= GRE_SEQ;
 228                 } else if (!matches(*argv, "csum")) {
 229                         iflags |= GRE_CSUM;
 230                         oflags |= GRE_CSUM;
 231                 } else if (!matches(*argv, "icsum")) {
 232                         iflags |= GRE_CSUM;
 233                 } else if (!matches(*argv, "ocsum")) {
 234                         oflags |= GRE_CSUM;
 235                 } else if (!matches(*argv, "nopmtudisc")) {
 236                         pmtudisc = 0;
 237                 } else if (!matches(*argv, "pmtudisc")) {
 238                         pmtudisc = 1;
 239                 } else if (!matches(*argv, "remote")) {
 240                         NEXT_ARG();
 241                         get_addr(&daddr, *argv, AF_INET);
 242                 } else if (!matches(*argv, "local")) {
 243                         NEXT_ARG();
 244                         get_addr(&saddr, *argv, AF_INET);
 245                 } else if (!matches(*argv, "dev")) {
 246                         NEXT_ARG();
 247                         link = ll_name_to_index(*argv);
 248                         if (link == 0) {
 249                                 fprintf(stderr, "Cannot find device \"%s\"\n",
 250                                         *argv);
 251                                 exit(-1);
 252                         }
 253                 } else if (!matches(*argv, "ttl") ||
 254                            !matches(*argv, "hoplimit") ||
 255                            !matches(*argv, "hlim")) {
 256                         NEXT_ARG();
 257                         if (strcmp(*argv, "inherit") != 0) {
 258                                 if (get_u8(&ttl, *argv, 0))
 259                                         invarg("invalid TTL\n", *argv);
 260                         } else
 261                                 ttl = 0;
 262                 } else if (!matches(*argv, "tos") ||
 263                            !matches(*argv, "tclass") ||
 264                            !matches(*argv, "dsfield")) {
 265                         __u32 uval;
 266
 267                         NEXT_ARG();
 268                         if (strcmp(*argv, "inherit") != 0) {
 269                                 if (rtnl_dsfield_a2n(&uval, *argv))
 270                                         invarg("bad TOS value", *argv);
 271                                 tos = uval;
 272                         } else
 273                                 tos = 1;
 274                 } else if (strcmp(*argv, "noencap") == 0) {
 275                         encaptype = TUNNEL_ENCAP_NONE;
 276                 } else if (strcmp(*argv, "encap") == 0) {
 277                         NEXT_ARG();
 278                         if (strcmp(*argv, "fou") == 0)
 279                                 encaptype = TUNNEL_ENCAP_FOU;
 280                         else if (strcmp(*argv, "gue") == 0)
 281                                 encaptype = TUNNEL_ENCAP_GUE;
 282                         else if (strcmp(*argv, "none") == 0)
 283                                 encaptype = TUNNEL_ENCAP_NONE;
 284                         else
 285                                 invarg("Invalid encap type.", *argv);
 286                 } else if (strcmp(*argv, "encap-sport") == 0) {
 287                         NEXT_ARG();
 288                         if (strcmp(*argv, "auto") == 0)
 289                                 encapsport = 0;
 290                         else if (get_u16(&encapsport, *argv, 0))
 291                                 invarg("Invalid source port.", *argv);
 292                 } else if (strcmp(*argv, "encap-dport") == 0) {
 293                         NEXT_ARG();
 294                         if (get_u16(&encapdport, *argv, 0))
 295                                 invarg("Invalid destination port.", *argv);
 296                 } else if (strcmp(*argv, "encap-csum") == 0) {
 297                         encapflags |= TUNNEL_ENCAP_FLAG_CSUM;
 298                 } else if (strcmp(*argv, "noencap-csum") == 0) {
 299                         encapflags &= ~TUNNEL_ENCAP_FLAG_CSUM;
 300                 } else if (strcmp(*argv, "encap-udp6-csum") == 0) {
 301                         encapflags |= TUNNEL_ENCAP_FLAG_CSUM6;
 302                 } else if (strcmp(*argv, "noencap-udp6-csum") == 0) {
 303                         encapflags &= ~TUNNEL_ENCAP_FLAG_CSUM6;
 304                 } else if (strcmp(*argv, "encap-remcsum") == 0) {
 305                         encapflags |= TUNNEL_ENCAP_FLAG_REMCSUM;
 306                 } else if (strcmp(*argv, "noencap-remcsum") == 0) {
 307                         encapflags &= ~TUNNEL_ENCAP_FLAG_REMCSUM;
 308                 } else if (strcmp(*argv, "external") == 0) {
 309                         metadata = 1;
 310                 } else if (strcmp(*argv, "ignore-df") == 0) {
 311                         ignore_df = 1;
 312                 } else if (strcmp(*argv, "noignore-df") == 0) {
 313                         /*
 314                          *only the lsb is significant, use 2 for presence
 315                          */
 316                         ignore_df = 2;
 317                 } else if (strcmp(*argv, "fwmark") == 0) {
 318                         NEXT_ARG();
 319                         if (get_u32(&fwmark, *argv, 0))
 320                                 invarg("invalid fwmark\n", *argv);
 321                 } else if (strcmp(*argv, "erspan") == 0) {
 322                         NEXT_ARG();
 323                         if (get_u32(&erspan_idx, *argv, 0))
 324                                 invarg("invalid erspan index\n", *argv);
 325                         if (erspan_idx & ~((1<<20) - 1) || erspan_idx == 0)
 326                                 invarg("erspan index must be > 0 and <= 20-bit\n", *argv);
 327                 } else if (strcmp(*argv, "erspan_ver") == 0) {
 328                         NEXT_ARG();
 329                         if (get_u8(&erspan_ver, *argv, 0))
 330                                 invarg("invalid erspan version\n", *argv);
 331                         if (erspan_ver != 1 && erspan_ver != 2)
 332                                 invarg("erspan version must be 1 or 2\n", *argv);
 333                 } else if (strcmp(*argv, "erspan_dir") == 0) {
 334                         NEXT_ARG();
 335                         if (matches(*argv, "ingress") == 0)
 336                                 erspan_dir = 0;
 337                         else if (matches(*argv, "egress") == 0)
 338                                 erspan_dir = 1;
 339                         else
 340                                 invarg("Invalid erspan direction.", *argv);
 341                 } else if (strcmp(*argv, "erspan_hwid") == 0) {
 342                         NEXT_ARG();
 343                         if (get_u16(&erspan_hwid, *argv, 0))
 344                                 invarg("invalid erspan hwid\n", *argv);
 345                 } else {
 346                         gre_print_help(lu, argc, argv, stderr);
 347                         return -1;
 348                 }
 349                 argc--; argv++;
 350         }
 351
 352         if (is_addrtype_inet_multi(&daddr)) {
 353                 if (!ikey) {
 354                         ikey = daddr.data[0];
 355                         iflags |= GRE_KEY;
 356                 }
 357                 if (!okey) {
 358                         okey = daddr.data[0];
 359                         oflags |= GRE_KEY;
 360                 }
 361                 if (!is_addrtype_inet_not_unspec(&saddr)) {
 362                         fprintf(stderr,
 363                                 "A broadcast tunnel requires a source address.\n");
 364                         return -1;
 365                 }
 366         }
 367
 368         if (metadata) {
 369                 addattr_l(n, 1024, IFLA_GRE_COLLECT_METADATA, NULL, 0);
 370                 return 0;
 371         }
 372
 373         addattr32(n, 1024, IFLA_GRE_IKEY, ikey);
 374         addattr32(n, 1024, IFLA_GRE_OKEY, okey);
 375         addattr_l(n, 1024, IFLA_GRE_IFLAGS, &iflags, 2);
 376         addattr_l(n, 1024, IFLA_GRE_OFLAGS, &oflags, 2);
 377         if (is_addrtype_inet(&saddr))
 378                 addattr_l(n, 1024, IFLA_GRE_LOCAL, saddr.data, saddr.bytelen);
 379         if (is_addrtype_inet(&daddr))
 380                 addattr_l(n, 1024, IFLA_GRE_REMOTE, daddr.data, daddr.bytelen);
 381         addattr_l(n, 1024, IFLA_GRE_PMTUDISC, &pmtudisc, 1);
 382         if (ignore_df)
 383                 addattr8(n, 1024, IFLA_GRE_IGNORE_DF, ignore_df & 1);
 384         addattr_l(n, 1024, IFLA_GRE_TOS, &tos, 1);
 385         if (link)
 386                 addattr32(n, 1024, IFLA_GRE_LINK, link);
 387         addattr_l(n, 1024, IFLA_GRE_TTL, &ttl, 1);
 388         addattr32(n, 1024, IFLA_GRE_FWMARK, fwmark);
 389         if (erspan_ver) {
 390                 addattr8(n, 1024, IFLA_GRE_ERSPAN_VER, erspan_ver);
 391                 if (erspan_ver == 1 && erspan_idx != 0) {
 392                         addattr32(n, 1024, IFLA_GRE_ERSPAN_INDEX, erspan_idx);
 393                 } else if (erspan_ver == 2) {
 394                         addattr8(n, 1024, IFLA_GRE_ERSPAN_DIR, erspan_dir);
 395                         addattr16(n, 1024, IFLA_GRE_ERSPAN_HWID, erspan_hwid);
 396                 }
 397         }
 398         addattr16(n, 1024, IFLA_GRE_ENCAP_TYPE, encaptype);
 399         addattr16(n, 1024, IFLA_GRE_ENCAP_FLAGS, encapflags);
 400         addattr16(n, 1024, IFLA_GRE_ENCAP_SPORT, htons(encapsport));
 401         addattr16(n, 1024, IFLA_GRE_ENCAP_DPORT, htons(encapdport));
 402
 403         return 0;
 404 }
 405
 406 static void gre_print_opt(struct link_util *lu, FILE *f, struct rtattr *tb[])
 407 {
 408         char s2[64];
 409         __u16 iflags = 0;
 410         __u16 oflags = 0;
 411         __u8 ttl = 0;
 412         __u8 tos = 0;
 413
 414         if (!tb)
 415                 return;
 416
 417         if (tb[IFLA_GRE_COLLECT_METADATA]) {
 418                 print_bool(PRINT_ANY, "external", "external", true);
 419                 return;
 420         }
 421
 422         tnl_print_endpoint("remote", tb[IFLA_GRE_REMOTE], AF_INET);
 423         tnl_print_endpoint("local", tb[IFLA_GRE_LOCAL], AF_INET);
 424
 425         if (tb[IFLA_GRE_LINK]) {
 426                 __u32 link = rta_getattr_u32(tb[IFLA_GRE_LINK]);
 427
 428                 if (link) {
 429                         print_string(PRINT_ANY, "link", "dev %s ",
 430                                      ll_index_to_name(link));
 431                 }
 432         }
 433
 434         if (tb[IFLA_GRE_TTL])
 435                 ttl = rta_getattr_u8(tb[IFLA_GRE_TTL]);
 436         if (is_json_context() || ttl)
 437                 print_uint(PRINT_ANY, "ttl", "ttl %u ", ttl);
 438         else
 439                 print_string(PRINT_FP, NULL, "ttl %s ", "inherit");
 440
 441         if (tb[IFLA_GRE_TOS])
 442                 tos = rta_getattr_u8(tb[IFLA_GRE_TOS]);
 443         if (tos) {
 444                 if (is_json_context() || tos != 1)
 445                         print_0xhex(PRINT_ANY, "tos", "tos 0x%x ", tos);
 446                 else
 447                         print_string(PRINT_FP, NULL, "tos %s ", "inherit");
 448         }
 449
 450         if (tb[IFLA_GRE_PMTUDISC]) {
 451                 if (!rta_getattr_u8(tb[IFLA_GRE_PMTUDISC]))
 452                         print_bool(PRINT_ANY, "pmtudisc", "nopmtudisc ", false);
 453                 else
 454                         print_bool(PRINT_JSON, "pmtudisc", NULL, true);
 455         }
 456
 457         if (tb[IFLA_GRE_IGNORE_DF] && rta_getattr_u8(tb[IFLA_GRE_IGNORE_DF]))
 458                 print_bool(PRINT_ANY, "ignore_df", "ignore-df ", true);
 459
 460         if (tb[IFLA_GRE_IFLAGS])
 461                 iflags = rta_getattr_u16(tb[IFLA_GRE_IFLAGS]);
 462
 463         if (tb[IFLA_GRE_OFLAGS])
 464                 oflags = rta_getattr_u16(tb[IFLA_GRE_OFLAGS]);
 465
 466         if ((iflags & GRE_KEY) && tb[IFLA_GRE_IKEY]) {
 467                 inet_ntop(AF_INET, RTA_DATA(tb[IFLA_GRE_IKEY]), s2, sizeof(s2));
 468                 print_string(PRINT_ANY, "ikey", "ikey %s ", s2);
 469         }
 470
 471         if ((oflags & GRE_KEY) && tb[IFLA_GRE_OKEY]) {
 472                 inet_ntop(AF_INET, RTA_DATA(tb[IFLA_GRE_OKEY]), s2, sizeof(s2));
 473                 print_string(PRINT_ANY, "okey", "okey %s ", s2);
 474         }
 475
 476         if (iflags & GRE_SEQ)
 477                 print_bool(PRINT_ANY, "iseq", "iseq ", true);
 478         if (oflags & GRE_SEQ)
 479                 print_bool(PRINT_ANY, "oseq", "oseq ", true);
 480         if (iflags & GRE_CSUM)
 481                 print_bool(PRINT_ANY, "icsum", "icsum ", true);
 482         if (oflags & GRE_CSUM)
 483                 print_bool(PRINT_ANY, "ocsum", "ocsum ", true);
 484
 485         if (tb[IFLA_GRE_FWMARK]) {
 486                 __u32 fwmark = rta_getattr_u32(tb[IFLA_GRE_FWMARK]);
 487
 488                 if (fwmark) {
 489                         print_0xhex(PRINT_ANY,
 490                                     "fwmark", "fwmark 0x%x ", fwmark);
 491                 }
 492         }
 493
 494         if (tb[IFLA_GRE_ERSPAN_INDEX]) {
 495                 __u32 erspan_idx = rta_getattr_u32(tb[IFLA_GRE_ERSPAN_INDEX]);
 496
 497                 print_uint(PRINT_ANY,
 498                            "erspan_index", "erspan_index %u ", erspan_idx);
 499         }
 500
 501         if (tb[IFLA_GRE_ERSPAN_VER]) {
 502                 __u8 erspan_ver = rta_getattr_u8(tb[IFLA_GRE_ERSPAN_VER]);
 503
 504                 print_uint(PRINT_ANY,
 505                            "erspan_ver", "erspan_ver %u ", erspan_ver);
 506         }
 507
 508         if (tb[IFLA_GRE_ERSPAN_DIR]) {
 509                 __u8 erspan_dir = rta_getattr_u8(tb[IFLA_GRE_ERSPAN_DIR]);
 510
 511                 if (erspan_dir == 0)
 512                         print_string(PRINT_ANY, "erspan_dir",
 513                                      "erspan_dir ingress ", NULL);
 514                 else
 515                         print_string(PRINT_ANY, "erspan_dir",
 516                                      "erspan_dir egress ", NULL);
 517         }
 518
 519         if (tb[IFLA_GRE_ERSPAN_HWID]) {
 520                 __u16 erspan_hwid = rta_getattr_u16(tb[IFLA_GRE_ERSPAN_HWID]);
 521
 522                 print_0xhex(PRINT_ANY,
 523                             "erspan_hwid", "erspan_hwid 0x%x ", erspan_hwid);
 524         }
 525
 526         tnl_print_encap(tb,
 527                         IFLA_GRE_ENCAP_TYPE,
 528                         IFLA_GRE_ENCAP_FLAGS,
 529                         IFLA_GRE_ENCAP_SPORT,
 530                         IFLA_GRE_ENCAP_DPORT);
 531 }
 532
 533 struct link_util gre_link_util = {
 534         .id = "gre",
 535         .maxattr = IFLA_GRE_MAX,
 536         .parse_opt = gre_parse_opt,
 537         .print_opt = gre_print_opt,
 538         .print_help = gre_print_help,
 539 };
 540
 541 struct link_util gretap_link_util = {
 542         .id = "gretap",
 543         .maxattr = IFLA_GRE_MAX,
 544         .parse_opt = gre_parse_opt,
 545         .print_opt = gre_print_opt,
 546         .print_help = gre_print_help,
 547 };
 548
 549 struct link_util erspan_link_util = {
 550         .id = "erspan",
 551         .maxattr = IFLA_GRE_MAX,
 552         .parse_opt = gre_parse_opt,
 553         .print_opt = gre_print_opt,
 554         .print_help = gre_print_help,
 555 };