ip/link_gre6.c

   1 /*
   2  * link_gre6.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:     Dmitry Kozlov <xeb@mail.ru>
  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 <linux/ip6_tunnel.h>
  22
  23 #include "rt_names.h"
  24 #include "utils.h"
  25 #include "ip_common.h"
  26 #include "tunnel.h"
  27
  28 #define IP6_FLOWINFO_TCLASS     htonl(0x0FF00000)
  29 #define IP6_FLOWINFO_FLOWLABEL  htonl(0x000FFFFF)
  30
  31 #define DEFAULT_TNL_HOP_LIMIT   (64)
  32
  33 static void gre_print_help(struct link_util *lu, int argc, char **argv, FILE *f)
  34 {
  35         fprintf(f,
  36                 "Usage: ... %-9s [ remote ADDR ]\n",
  37                 lu->id
  38         );
  39         fprintf(f,
  40                 "                     [ local ADDR ]\n"
  41                 "                     [ [no][i|o]seq ]\n"
  42                 "                     [ [i|o]key KEY | no[i|o]key ]\n"
  43                 "                     [ [no][i|o]csum ]\n"
  44                 "                     [ hoplimit TTL ]\n"
  45                 "                     [ encaplimit ELIM ]\n"
  46                 "                     [ tclass TCLASS ]\n"
  47                 "                     [ flowlabel FLOWLABEL ]\n"
  48                 "                     [ dscp inherit ]\n"
  49                 "                     [ dev PHYS_DEV ]\n"
  50                 "                     [ fwmark MARK ]\n"
  51                 "                     [ [no]allow-localremote ]\n"
  52                 "                     [ external ]\n"
  53                 "                     [ noencap ]\n"
  54                 "                     [ encap { fou | gue | none } ]\n"
  55                 "                     [ encap-sport PORT ]\n"
  56                 "                     [ encap-dport PORT ]\n"
  57                 "                     [ [no]encap-csum ]\n"
  58                 "                     [ [no]encap-csum6 ]\n"
  59                 "                     [ [no]encap-remcsum ]\n"
  60                 "                     [ erspan_ver version ]\n"
  61                 "                     [ erspan IDX ]\n"
  62                 "                     [ erspan_dir { ingress | egress } ]\n"
  63                 "                     [ erspan_hwid hwid ]\n"
  64                 "\n"
  65         );
  66         fprintf(f,
  67                 "Where: ADDR      := IPV6_ADDRESS\n"
  68                 "       TTL       := { 0..255 } (default=%d)\n"
  69                 "       KEY       := { DOTTED_QUAD | NUMBER }\n"
  70                 "       ELIM      := { none | 0..255 }(default=%d)\n"
  71                 "       TCLASS    := { 0x0..0xff | inherit }\n"
  72                 "       FLOWLABEL := { 0x0..0xfffff | inherit }\n"
  73                 "       MARK      := { 0x0..0xffffffff | inherit }\n",
  74                 DEFAULT_TNL_HOP_LIMIT, IPV6_DEFAULT_TNL_ENCAP_LIMIT
  75         );
  76 }
  77
  78 static int gre_parse_opt(struct link_util *lu, int argc, char **argv,
  79                          struct nlmsghdr *n)
  80 {
  81         struct ifinfomsg *ifi = NLMSG_DATA(n);
  82         struct {
  83                 struct nlmsghdr n;
  84                 struct ifinfomsg i;
  85         } req = {
  86                 .n.nlmsg_len = NLMSG_LENGTH(sizeof(*ifi)),
  87                 .n.nlmsg_flags = NLM_F_REQUEST,
  88                 .n.nlmsg_type = RTM_GETLINK,
  89                 .i.ifi_family = preferred_family,
  90                 .i.ifi_index = ifi->ifi_index,
  91         };
  92         struct nlmsghdr *answer;
  93         struct rtattr *tb[IFLA_MAX + 1];
  94         struct rtattr *linkinfo[IFLA_INFO_MAX+1];
  95         struct rtattr *greinfo[IFLA_GRE_MAX + 1];
  96         int len;
  97         __u16 iflags = 0;
  98         __u16 oflags = 0;
  99         __be32 ikey = 0;
 100         __be32 okey = 0;
 101         inet_prefix saddr, daddr;
 102         __u8 hop_limit = DEFAULT_TNL_HOP_LIMIT;
 103         __u8 encap_limit = IPV6_DEFAULT_TNL_ENCAP_LIMIT;
 104         __u32 flowinfo = 0;
 105         __u32 flags = 0;
 106         __u32 link = 0;
 107         __u16 encaptype = 0;
 108         __u16 encapflags = TUNNEL_ENCAP_FLAG_CSUM6;
 109         __u16 encapsport = 0;
 110         __u16 encapdport = 0;
 111         __u8 metadata = 0;
 112         __u32 fwmark = 0;
 113         __u32 erspan_idx = 0;
 114         __u8 erspan_ver = 0;
 115         __u8 erspan_dir = 0;
 116         __u16 erspan_hwid = 0;
 117
 118         inet_prefix_reset(&saddr);
 119         inet_prefix_reset(&daddr);
 120
 121         if (!(n->nlmsg_flags & NLM_F_CREATE)) {
 122                 const struct rtattr *rta;
 123
 124                 if (rtnl_talk(&rth, &req.n, &answer) < 0) {
 125 get_failed:
 126                         fprintf(stderr,
 127                                 "Failed to get existing tunnel info.\n");
 128                         return -1;
 129                 }
 130
 131                 len = answer->nlmsg_len;
 132                 len -= NLMSG_LENGTH(sizeof(*ifi));
 133                 if (len < 0)
 134                         goto get_failed;
 135
 136                 parse_rtattr(tb, IFLA_MAX, IFLA_RTA(NLMSG_DATA(answer)), len);
 137
 138                 if (!tb[IFLA_LINKINFO])
 139                         goto get_failed;
 140
 141                 parse_rtattr_nested(linkinfo, IFLA_INFO_MAX, tb[IFLA_LINKINFO]);
 142
 143                 if (!linkinfo[IFLA_INFO_DATA])
 144                         goto get_failed;
 145
 146                 parse_rtattr_nested(greinfo, IFLA_GRE_MAX,
 147                                     linkinfo[IFLA_INFO_DATA]);
 148
 149                 rta = greinfo[IFLA_GRE_LOCAL];
 150                 if (rta && get_addr_rta(&saddr, rta, AF_INET6))
 151                         goto get_failed;
 152
 153                 rta = greinfo[IFLA_GRE_REMOTE];
 154                 if (rta && get_addr_rta(&daddr, rta, AF_INET6))
 155                         goto get_failed;
 156
 157                 if (greinfo[IFLA_GRE_IKEY])
 158                         ikey = rta_getattr_u32(greinfo[IFLA_GRE_IKEY]);
 159
 160                 if (greinfo[IFLA_GRE_OKEY])
 161                         okey = rta_getattr_u32(greinfo[IFLA_GRE_OKEY]);
 162
 163                 if (greinfo[IFLA_GRE_IFLAGS])
 164                         iflags = rta_getattr_u16(greinfo[IFLA_GRE_IFLAGS]);
 165
 166                 if (greinfo[IFLA_GRE_OFLAGS])
 167                         oflags = rta_getattr_u16(greinfo[IFLA_GRE_OFLAGS]);
 168
 169                 if (greinfo[IFLA_GRE_TTL])
 170                         hop_limit = rta_getattr_u8(greinfo[IFLA_GRE_TTL]);
 171
 172                 if (greinfo[IFLA_GRE_LINK])
 173                         link = rta_getattr_u32(greinfo[IFLA_GRE_LINK]);
 174
 175                 if (greinfo[IFLA_GRE_ENCAP_LIMIT])
 176                         encap_limit = rta_getattr_u8(greinfo[IFLA_GRE_ENCAP_LIMIT]);
 177
 178                 if (greinfo[IFLA_GRE_FLOWINFO])
 179                         flowinfo = rta_getattr_u32(greinfo[IFLA_GRE_FLOWINFO]);
 180
 181                 if (greinfo[IFLA_GRE_FLAGS])
 182                         flags = rta_getattr_u32(greinfo[IFLA_GRE_FLAGS]);
 183
 184                 if (greinfo[IFLA_GRE_ENCAP_TYPE])
 185                         encaptype = rta_getattr_u16(greinfo[IFLA_GRE_ENCAP_TYPE]);
 186
 187                 if (greinfo[IFLA_GRE_ENCAP_FLAGS])
 188                         encapflags = rta_getattr_u16(greinfo[IFLA_GRE_ENCAP_FLAGS]);
 189
 190                 if (greinfo[IFLA_GRE_ENCAP_SPORT])
 191                         encapsport = rta_getattr_u16(greinfo[IFLA_GRE_ENCAP_SPORT]);
 192
 193                 if (greinfo[IFLA_GRE_ENCAP_DPORT])
 194                         encapdport = rta_getattr_u16(greinfo[IFLA_GRE_ENCAP_DPORT]);
 195
 196                 if (greinfo[IFLA_GRE_COLLECT_METADATA])
 197                         metadata = 1;
 198
 199                 if (greinfo[IFLA_GRE_FWMARK])
 200                         fwmark = rta_getattr_u32(greinfo[IFLA_GRE_FWMARK]);
 201
 202                 if (greinfo[IFLA_GRE_ERSPAN_INDEX])
 203                         erspan_idx = rta_getattr_u32(greinfo[IFLA_GRE_ERSPAN_INDEX]);
 204
 205                 if (greinfo[IFLA_GRE_ERSPAN_VER])
 206                         erspan_ver = rta_getattr_u8(greinfo[IFLA_GRE_ERSPAN_VER]);
 207
 208                 if (greinfo[IFLA_GRE_ERSPAN_DIR])
 209                         erspan_dir = rta_getattr_u8(greinfo[IFLA_GRE_ERSPAN_DIR]);
 210
 211                 if (greinfo[IFLA_GRE_ERSPAN_HWID])
 212                         erspan_hwid = rta_getattr_u16(greinfo[IFLA_GRE_ERSPAN_HWID]);
 213
 214                 free(answer);
 215         }
 216
 217         while (argc > 0) {
 218                 if (!matches(*argv, "key")) {
 219                         NEXT_ARG();
 220                         iflags |= GRE_KEY;
 221                         oflags |= GRE_KEY;
 222                         ikey = okey = tnl_parse_key("key", *argv);
 223                 } else if (!matches(*argv, "nokey")) {
 224                         iflags &= ~GRE_KEY;
 225                         oflags &= ~GRE_KEY;
 226                         ikey = okey = 0;
 227                 } else if (!matches(*argv, "ikey")) {
 228                         NEXT_ARG();
 229                         iflags |= GRE_KEY;
 230                         ikey = tnl_parse_key("ikey", *argv);
 231                 } else if (!matches(*argv, "noikey")) {
 232                         iflags &= ~GRE_KEY;
 233                         ikey = 0;
 234                 } else if (!matches(*argv, "okey")) {
 235                         NEXT_ARG();
 236                         oflags |= GRE_KEY;
 237                         okey = tnl_parse_key("okey", *argv);
 238                 } else if (!matches(*argv, "nookey")) {
 239                         oflags &= ~GRE_KEY;
 240                         okey = 0;
 241                 } else if (!matches(*argv, "seq")) {
 242                         iflags |= GRE_SEQ;
 243                         oflags |= GRE_SEQ;
 244                 } else if (!matches(*argv, "noseq")) {
 245                         iflags &= ~GRE_SEQ;
 246                         oflags &= ~GRE_SEQ;
 247                 } else if (!matches(*argv, "iseq")) {
 248                         iflags |= GRE_SEQ;
 249                 } else if (!matches(*argv, "noiseq")) {
 250                         iflags &= ~GRE_SEQ;
 251                 } else if (!matches(*argv, "oseq")) {
 252                         oflags |= GRE_SEQ;
 253                 } else if (!matches(*argv, "nooseq")) {
 254                         oflags &= ~GRE_SEQ;
 255                 } else if (!matches(*argv, "csum")) {
 256                         iflags |= GRE_CSUM;
 257                         oflags |= GRE_CSUM;
 258                 } else if (!matches(*argv, "nocsum")) {
 259                         iflags &= ~GRE_CSUM;
 260                         oflags &= ~GRE_CSUM;
 261                 } else if (!matches(*argv, "icsum")) {
 262                         iflags |= GRE_CSUM;
 263                 } else if (!matches(*argv, "noicsum")) {
 264                         iflags &= ~GRE_CSUM;
 265                 } else if (!matches(*argv, "ocsum")) {
 266                         oflags |= GRE_CSUM;
 267                 } else if (!matches(*argv, "noocsum")) {
 268                         oflags &= ~GRE_CSUM;
 269                 } else if (!matches(*argv, "remote")) {
 270                         NEXT_ARG();
 271                         get_addr(&daddr, *argv, AF_INET6);
 272                 } else if (!matches(*argv, "local")) {
 273                         NEXT_ARG();
 274                         get_addr(&saddr, *argv, AF_INET6);
 275                 } else if (!matches(*argv, "dev")) {
 276                         NEXT_ARG();
 277                         link = ll_name_to_index(*argv);
 278                         if (!link)
 279                                 exit(nodev(*argv));
 280                 } else if (!matches(*argv, "ttl") ||
 281                            !matches(*argv, "hoplimit") ||
 282                            !matches(*argv, "hlim")) {
 283                         NEXT_ARG();
 284                         if (strcmp(*argv, "inherit") != 0) {
 285                                 if (get_u8(&hop_limit, *argv, 0))
 286                                         invarg("invalid HLIM\n", *argv);
 287                         } else
 288                                 hop_limit = 0;
 289                 } else if (!matches(*argv, "tos") ||
 290                            !matches(*argv, "tclass") ||
 291                            !matches(*argv, "dsfield")) {
 292                         __u8 uval;
 293
 294                         NEXT_ARG();
 295                         flowinfo &= ~IP6_FLOWINFO_TCLASS;
 296                         if (strcmp(*argv, "inherit") == 0)
 297                                 flags |= IP6_TNL_F_USE_ORIG_TCLASS;
 298                         else {
 299                                 if (get_u8(&uval, *argv, 16))
 300                                         invarg("invalid TClass", *argv);
 301                                 flowinfo |= htonl((__u32)uval << 20) & IP6_FLOWINFO_TCLASS;
 302                                 flags &= ~IP6_TNL_F_USE_ORIG_TCLASS;
 303                         }
 304                 } else if (strcmp(*argv, "flowlabel") == 0 ||
 305                            strcmp(*argv, "fl") == 0) {
 306                         __u32 uval;
 307
 308                         NEXT_ARG();
 309                         flowinfo &= ~IP6_FLOWINFO_FLOWLABEL;
 310                         if (strcmp(*argv, "inherit") == 0)
 311                                 flags |= IP6_TNL_F_USE_ORIG_FLOWLABEL;
 312                         else {
 313                                 if (get_u32(&uval, *argv, 16))
 314                                         invarg("invalid Flowlabel", *argv);
 315                                 if (uval > 0xFFFFF)
 316                                         invarg("invalid Flowlabel", *argv);
 317                                 flowinfo |= htonl(uval) & IP6_FLOWINFO_FLOWLABEL;
 318                                 flags &= ~IP6_TNL_F_USE_ORIG_FLOWLABEL;
 319                         }
 320                 } else if (strcmp(*argv, "dscp") == 0) {
 321                         NEXT_ARG();
 322                         if (strcmp(*argv, "inherit") != 0)
 323                                 invarg("not inherit", *argv);
 324                         flags |= IP6_TNL_F_RCV_DSCP_COPY;
 325                 } else if (strcmp(*argv, "noencap") == 0) {
 326                         encaptype = TUNNEL_ENCAP_NONE;
 327                 } else if (strcmp(*argv, "encap") == 0) {
 328                         NEXT_ARG();
 329                         if (strcmp(*argv, "fou") == 0)
 330                                 encaptype = TUNNEL_ENCAP_FOU;
 331                         else if (strcmp(*argv, "gue") == 0)
 332                                 encaptype = TUNNEL_ENCAP_GUE;
 333                         else if (strcmp(*argv, "none") == 0)
 334                                 encaptype = TUNNEL_ENCAP_NONE;
 335                         else
 336                                 invarg("Invalid encap type.", *argv);
 337                 } else if (strcmp(*argv, "encap-sport") == 0) {
 338                         NEXT_ARG();
 339                         if (strcmp(*argv, "auto") == 0)
 340                                 encapsport = 0;
 341                         else if (get_u16(&encapsport, *argv, 0))
 342                                 invarg("Invalid source port.", *argv);
 343                 } else if (strcmp(*argv, "encap-dport") == 0) {
 344                         NEXT_ARG();
 345                         if (get_u16(&encapdport, *argv, 0))
 346                                 invarg("Invalid destination port.", *argv);
 347                 } else if (strcmp(*argv, "encap-csum") == 0) {
 348                         encapflags |= TUNNEL_ENCAP_FLAG_CSUM;
 349                 } else if (strcmp(*argv, "noencap-csum") == 0) {
 350                         encapflags &= ~TUNNEL_ENCAP_FLAG_CSUM;
 351                 } else if (strcmp(*argv, "encap-udp6-csum") == 0) {
 352                         encapflags |= TUNNEL_ENCAP_FLAG_CSUM6;
 353                 } else if (strcmp(*argv, "noencap-udp6-csum") == 0) {
 354                         encapflags &= ~TUNNEL_ENCAP_FLAG_CSUM6;
 355                 } else if (strcmp(*argv, "encap-remcsum") == 0) {
 356                         encapflags |= TUNNEL_ENCAP_FLAG_REMCSUM;
 357                 } else if (strcmp(*argv, "noencap-remcsum") == 0) {
 358                         encapflags &= ~TUNNEL_ENCAP_FLAG_REMCSUM;
 359                 } else if (strcmp(*argv, "external") == 0) {
 360                         metadata = 1;
 361                 } else if (strcmp(*argv, "fwmark") == 0) {
 362                         NEXT_ARG();
 363                         if (strcmp(*argv, "inherit") == 0) {
 364                                 flags |= IP6_TNL_F_USE_ORIG_FWMARK;
 365                                 fwmark = 0;
 366                         } else {
 367                                 if (get_u32(&fwmark, *argv, 0))
 368                                         invarg("invalid fwmark\n", *argv);
 369                                 flags &= ~IP6_TNL_F_USE_ORIG_FWMARK;
 370                         }
 371                 } else if (strcmp(*argv, "allow-localremote") == 0) {
 372                         flags |= IP6_TNL_F_ALLOW_LOCAL_REMOTE;
 373                 } else if (strcmp(*argv, "noallow-localremote") == 0) {
 374                         flags &= ~IP6_TNL_F_ALLOW_LOCAL_REMOTE;
 375                 } else if (strcmp(*argv, "encaplimit") == 0) {
 376                         NEXT_ARG();
 377                         if (strcmp(*argv, "none") == 0) {
 378                                 flags |= IP6_TNL_F_IGN_ENCAP_LIMIT;
 379                         } else {
 380                                 __u8 uval;
 381
 382                                 if (get_u8(&uval, *argv, 0))
 383                                         invarg("invalid ELIM", *argv);
 384                                 encap_limit = uval;
 385                                 flags &= ~IP6_TNL_F_IGN_ENCAP_LIMIT;
 386                         }
 387                 } else if (strcmp(*argv, "erspan") == 0) {
 388                         NEXT_ARG();
 389                         if (get_u32(&erspan_idx, *argv, 0))
 390                                 invarg("invalid erspan index\n", *argv);
 391                         if (erspan_idx & ~((1<<20) - 1) || erspan_idx == 0)
 392                                 invarg("erspan index must be > 0 and <= 20-bit\n", *argv);
 393                 } else if (strcmp(*argv, "erspan_ver") == 0) {
 394                         NEXT_ARG();
 395                         if (get_u8(&erspan_ver, *argv, 0))
 396                                 invarg("invalid erspan version\n", *argv);
 397                         if (erspan_ver != 1 && erspan_ver != 2)
 398                                 invarg("erspan version must be 1 or 2\n", *argv);
 399                 } else if (strcmp(*argv, "erspan_dir") == 0) {
 400                         NEXT_ARG();
 401                         if (matches(*argv, "ingress") == 0)
 402                                 erspan_dir = 0;
 403                         else if (matches(*argv, "egress") == 0)
 404                                 erspan_dir = 1;
 405                         else
 406                                 invarg("Invalid erspan direction.", *argv);
 407                 } else if (strcmp(*argv, "erspan_hwid") == 0) {
 408                         NEXT_ARG();
 409                         if (get_u16(&erspan_hwid, *argv, 0))
 410                                 invarg("invalid erspan hwid\n", *argv);
 411                 } else {
 412                         gre_print_help(lu, argc, argv, stderr);
 413                         return -1;
 414                 }
 415                 argc--; argv++;
 416         }
 417
 418         if (metadata) {
 419                 addattr_l(n, 1024, IFLA_GRE_COLLECT_METADATA, NULL, 0);
 420                 return 0;
 421         }
 422
 423         addattr32(n, 1024, IFLA_GRE_IKEY, ikey);
 424         addattr32(n, 1024, IFLA_GRE_OKEY, okey);
 425         addattr_l(n, 1024, IFLA_GRE_IFLAGS, &iflags, 2);
 426         addattr_l(n, 1024, IFLA_GRE_OFLAGS, &oflags, 2);
 427         if (is_addrtype_inet_not_unspec(&saddr))
 428                 addattr_l(n, 1024, IFLA_GRE_LOCAL, saddr.data, saddr.bytelen);
 429         if (is_addrtype_inet_not_unspec(&daddr))
 430                 addattr_l(n, 1024, IFLA_GRE_REMOTE, daddr.data, daddr.bytelen);
 431         if (link)
 432                 addattr32(n, 1024, IFLA_GRE_LINK, link);
 433         addattr_l(n, 1024, IFLA_GRE_TTL, &hop_limit, 1);
 434         addattr_l(n, 1024, IFLA_GRE_ENCAP_LIMIT, &encap_limit, 1);
 435         addattr_l(n, 1024, IFLA_GRE_FLOWINFO, &flowinfo, 4);
 436         addattr32(n, 1024, IFLA_GRE_FLAGS, flags);
 437         addattr32(n, 1024, IFLA_GRE_FWMARK, fwmark);
 438         if (erspan_ver) {
 439                 addattr8(n, 1024, IFLA_GRE_ERSPAN_VER, erspan_ver);
 440                 if (erspan_ver == 1 && erspan_idx != 0) {
 441                         addattr32(n, 1024, IFLA_GRE_ERSPAN_INDEX, erspan_idx);
 442                 } else if (erspan_ver == 2) {
 443                         addattr8(n, 1024, IFLA_GRE_ERSPAN_DIR, erspan_dir);
 444                         addattr16(n, 1024, IFLA_GRE_ERSPAN_HWID, erspan_hwid);
 445                 }
 446         }
 447         addattr16(n, 1024, IFLA_GRE_ENCAP_TYPE, encaptype);
 448         addattr16(n, 1024, IFLA_GRE_ENCAP_FLAGS, encapflags);
 449         addattr16(n, 1024, IFLA_GRE_ENCAP_SPORT, htons(encapsport));
 450         addattr16(n, 1024, IFLA_GRE_ENCAP_DPORT, htons(encapdport));
 451
 452         return 0;
 453 }
 454
 455 static void gre_print_opt(struct link_util *lu, FILE *f, struct rtattr *tb[])
 456 {
 457         char s2[64];
 458         __u16 iflags = 0;
 459         __u16 oflags = 0;
 460         __u32 flags = 0;
 461         __u32 flowinfo = 0;
 462         __u8 ttl = 0;
 463
 464         if (!tb)
 465                 return;
 466
 467         if (tb[IFLA_GRE_COLLECT_METADATA]) {
 468                 print_bool(PRINT_ANY, "external", "external", true);
 469                 return;
 470         }
 471
 472         if (tb[IFLA_GRE_FLAGS])
 473                 flags = rta_getattr_u32(tb[IFLA_GRE_FLAGS]);
 474
 475         if (tb[IFLA_GRE_FLOWINFO])
 476                 flowinfo = rta_getattr_u32(tb[IFLA_GRE_FLOWINFO]);
 477
 478         tnl_print_endpoint("remote", tb[IFLA_GRE_REMOTE], AF_INET6);
 479         tnl_print_endpoint("local", tb[IFLA_GRE_LOCAL], AF_INET6);
 480
 481         if (tb[IFLA_GRE_LINK]) {
 482                 __u32 link = rta_getattr_u32(tb[IFLA_GRE_LINK]);
 483
 484                 if (link) {
 485                         print_string(PRINT_ANY, "link", "dev %s ",
 486                                      ll_index_to_name(link));
 487                 }
 488         }
 489
 490         if (tb[IFLA_GRE_TTL])
 491                 ttl = rta_getattr_u8(tb[IFLA_GRE_TTL]);
 492         if (is_json_context() || ttl)
 493                 print_uint(PRINT_ANY, "ttl", "hoplimit %u ", ttl);
 494         else
 495                 print_string(PRINT_FP, NULL, "hoplimit %s ", "inherit");
 496
 497         if (flags & IP6_TNL_F_IGN_ENCAP_LIMIT) {
 498                 print_bool(PRINT_ANY,
 499                            "ip6_tnl_f_ign_encap_limit",
 500                            "encaplimit none ",
 501                            true);
 502         } else if (tb[IFLA_GRE_ENCAP_LIMIT]) {
 503                 __u8 val = rta_getattr_u8(tb[IFLA_GRE_ENCAP_LIMIT]);
 504
 505                 print_uint(PRINT_ANY, "encap_limit", "encaplimit %u ", val);
 506         }
 507
 508         if (flags & IP6_TNL_F_USE_ORIG_TCLASS) {
 509                 print_bool(PRINT_ANY,
 510                            "ip6_tnl_f_use_orig_tclass",
 511                            "tclass inherit ",
 512                            true);
 513         } else if (tb[IFLA_GRE_FLOWINFO]) {
 514                 __u32 val = ntohl(flowinfo & IP6_FLOWINFO_TCLASS) >> 20;
 515
 516                 snprintf(s2, sizeof(s2), "0x%02x", val);
 517                 print_string(PRINT_ANY, "tclass", "tclass %s ", s2);
 518         }
 519
 520         if (flags & IP6_TNL_F_USE_ORIG_FLOWLABEL) {
 521                 print_bool(PRINT_ANY,
 522                            "ip6_tnl_f_use_orig_flowlabel",
 523                            "flowlabel inherit ",
 524                            true);
 525         } else if (tb[IFLA_GRE_FLOWINFO]) {
 526                 __u32 val = ntohl(flowinfo & IP6_FLOWINFO_FLOWLABEL);
 527
 528                 snprintf(s2, sizeof(s2), "0x%05x", val);
 529                 print_string(PRINT_ANY, "flowlabel", "flowlabel %s ", s2);
 530         }
 531
 532         if (flags & IP6_TNL_F_RCV_DSCP_COPY)
 533                 print_bool(PRINT_ANY,
 534                            "ip6_tnl_f_rcv_dscp_copy",
 535                            "dscp inherit ",
 536                            true);
 537
 538         if (tb[IFLA_GRE_IFLAGS])
 539                 iflags = rta_getattr_u16(tb[IFLA_GRE_IFLAGS]);
 540
 541         if (tb[IFLA_GRE_OFLAGS])
 542                 oflags = rta_getattr_u16(tb[IFLA_GRE_OFLAGS]);
 543
 544         if ((iflags & GRE_KEY) && tb[IFLA_GRE_IKEY]) {
 545                 inet_ntop(AF_INET, RTA_DATA(tb[IFLA_GRE_IKEY]), s2, sizeof(s2));
 546                 print_string(PRINT_ANY, "ikey", "ikey %s ", s2);
 547         }
 548
 549         if ((oflags & GRE_KEY) && tb[IFLA_GRE_OKEY]) {
 550                 inet_ntop(AF_INET, RTA_DATA(tb[IFLA_GRE_OKEY]), s2, sizeof(s2));
 551                 print_string(PRINT_ANY, "okey", "okey %s ", s2);
 552         }
 553
 554         if (iflags & GRE_SEQ)
 555                 print_bool(PRINT_ANY, "iseq", "iseq ", true);
 556         if (oflags & GRE_SEQ)
 557                 print_bool(PRINT_ANY, "oseq", "oseq ", true);
 558         if (iflags & GRE_CSUM)
 559                 print_bool(PRINT_ANY, "icsum", "icsum ", true);
 560         if (oflags & GRE_CSUM)
 561                 print_bool(PRINT_ANY, "ocsum", "ocsum ", true);
 562
 563         if (flags & IP6_TNL_F_ALLOW_LOCAL_REMOTE)
 564                 print_bool(PRINT_ANY,
 565                            "ip6_tnl_f_allow_local_remote",
 566                            "allow-localremote ",
 567                            true);
 568
 569         if (flags & IP6_TNL_F_USE_ORIG_FWMARK) {
 570                 print_bool(PRINT_ANY,
 571                            "ip6_tnl_f_use_orig_fwmark",
 572                            "fwmark inherit ",
 573                            true);
 574         } else if (tb[IFLA_GRE_FWMARK]) {
 575                 __u32 fwmark = rta_getattr_u32(tb[IFLA_GRE_FWMARK]);
 576
 577                 if (fwmark) {
 578                         print_0xhex(PRINT_ANY,
 579                                     "fwmark", "fwmark 0x%x ", fwmark);
 580                 }
 581         }
 582
 583         if (tb[IFLA_GRE_ERSPAN_INDEX]) {
 584                 __u32 erspan_idx = rta_getattr_u32(tb[IFLA_GRE_ERSPAN_INDEX]);
 585
 586                 print_uint(PRINT_ANY,
 587                            "erspan_index", "erspan_index %u ", erspan_idx);
 588         }
 589
 590         if (tb[IFLA_GRE_ERSPAN_VER]) {
 591                 __u8 erspan_ver = rta_getattr_u8(tb[IFLA_GRE_ERSPAN_VER]);
 592
 593                 print_uint(PRINT_ANY,
 594                            "erspan_ver", "erspan_ver %u ", erspan_ver);
 595         }
 596
 597         if (tb[IFLA_GRE_ERSPAN_DIR]) {
 598                 __u8 erspan_dir = rta_getattr_u8(tb[IFLA_GRE_ERSPAN_DIR]);
 599
 600                 if (erspan_dir == 0)
 601                         print_string(PRINT_ANY, "erspan_dir",
 602                                      "erspan_dir ingress ", NULL);
 603                 else
 604                         print_string(PRINT_ANY, "erspan_dir",
 605                                      "erspan_dir egress ", NULL);
 606         }
 607
 608         if (tb[IFLA_GRE_ERSPAN_HWID]) {
 609                 __u16 erspan_hwid = rta_getattr_u16(tb[IFLA_GRE_ERSPAN_HWID]);
 610
 611                 print_0xhex(PRINT_ANY,
 612                             "erspan_hwid", "erspan_hwid 0x%x ", erspan_hwid);
 613         }
 614
 615         tnl_print_encap(tb,
 616                         IFLA_GRE_ENCAP_TYPE,
 617                         IFLA_GRE_ENCAP_FLAGS,
 618                         IFLA_GRE_ENCAP_SPORT,
 619                         IFLA_GRE_ENCAP_DPORT);
 620 }
 621
 622 struct link_util ip6gre_link_util = {
 623         .id = "ip6gre",
 624         .maxattr = IFLA_GRE_MAX,
 625         .parse_opt = gre_parse_opt,
 626         .print_opt = gre_print_opt,
 627         .print_help = gre_print_help,
 628 };
 629
 630 struct link_util ip6gretap_link_util = {
 631         .id = "ip6gretap",
 632         .maxattr = IFLA_GRE_MAX,
 633         .parse_opt = gre_parse_opt,
 634         .print_opt = gre_print_opt,
 635         .print_help = gre_print_help,
 636 };
 637
 638 struct link_util ip6erspan_link_util = {
 639         .id = "ip6erspan",
 640         .maxattr = IFLA_GRE_MAX,
 641         .parse_opt = gre_parse_opt,
 642         .print_opt = gre_print_opt,
 643         .print_help = gre_print_help,
 644 };