ip/link_iptnl.c

   1 /*
   2  * link_iptnl.c ipip and sit 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:     Nicolas Dichtel <nicolas.dichtel@6wind.com>
  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/in.h>
  20 #include <linux/ip.h>
  21 #include <linux/if_tunnel.h>
  22 #include "rt_names.h"
  23 #include "utils.h"
  24 #include "ip_common.h"
  25 #include "tunnel.h"
  26
  27 static void print_usage(FILE *f, int sit)
  28 {
  29         const char *type = sit ? "sit " : "ipip";
  30
  31         fprintf(f,
  32                 "Usage: ... %s [ remote ADDR ]\n"
  33                 "                [ local ADDR ]\n"
  34                 "                [ ttl TTL ]\n"
  35                 "                [ tos TOS ]\n"
  36                 "                [ [no]pmtudisc ]\n"
  37                 "                [ dev PHYS_DEV ]\n"
  38                 "                [ 6rd-prefix ADDR ]\n"
  39                 "                [ 6rd-relay_prefix ADDR ]\n"
  40                 "                [ 6rd-reset ]\n"
  41                 "                [ noencap ]\n"
  42                 "                [ encap { fou | gue | none } ]\n"
  43                 "                [ encap-sport PORT ]\n"
  44                 "                [ encap-dport PORT ]\n"
  45                 "                [ [no]encap-csum ]\n"
  46                 "                [ [no]encap-csum6 ]\n"
  47                 "                [ [no]encap-remcsum ]\n",
  48                 type
  49         );
  50         if (sit) {
  51                 fprintf(f, "          [ mode { ip6ip | ipip | mplsip | any } ]\n");
  52                 fprintf(f, "          [ isatap ]\n");
  53         } else {
  54                 fprintf(f, "          [ mode { ipip | mplsip | any } ]\n");
  55         }
  56         fprintf(f, "                [ external ]\n");
  57         fprintf(f, "                [ fwmark MARK ]\n");
  58         fprintf(f, "\n");
  59         fprintf(f, "Where: ADDR := { IP_ADDRESS | any }\n");
  60         fprintf(f, "       TOS  := { NUMBER | inherit }\n");
  61         fprintf(f, "       TTL  := { 1..255 | inherit }\n");
  62         fprintf(f, "       MARK := { 0x0..0xffffffff }\n");
  63 }
  64
  65 static void usage(int sit) __attribute__((noreturn));
  66 static void usage(int sit)
  67 {
  68         print_usage(stderr, sit);
  69         exit(-1);
  70 }
  71
  72 static int iptunnel_parse_opt(struct link_util *lu, int argc, char **argv,
  73                               struct nlmsghdr *n)
  74 {
  75         struct ifinfomsg *ifi = (struct ifinfomsg *)(n + 1);
  76         struct {
  77                 struct nlmsghdr n;
  78                 struct ifinfomsg i;
  79         } req = {
  80                 .n.nlmsg_len = NLMSG_LENGTH(sizeof(*ifi)),
  81                 .n.nlmsg_flags = NLM_F_REQUEST,
  82                 .n.nlmsg_type = RTM_GETLINK,
  83                 .i.ifi_family = preferred_family,
  84                 .i.ifi_index = ifi->ifi_index,
  85         };
  86         struct nlmsghdr *answer;
  87         struct rtattr *tb[IFLA_MAX + 1];
  88         struct rtattr *linkinfo[IFLA_INFO_MAX+1];
  89         struct rtattr *iptuninfo[IFLA_IPTUN_MAX + 1];
  90         int len;
  91         __u32 link = 0;
  92         __u32 laddr = 0;
  93         __u32 raddr = 0;
  94         __u8 ttl = 0;
  95         __u8 tos = 0;
  96         __u8 pmtudisc = 1;
  97         __u16 iflags = 0;
  98         __u8 proto = 0;
  99         struct in6_addr ip6rdprefix = {};
 100         __u16 ip6rdprefixlen = 0;
 101         __u32 ip6rdrelayprefix = 0;
 102         __u16 ip6rdrelayprefixlen = 0;
 103         __u16 encaptype = 0;
 104         __u16 encapflags = 0;
 105         __u16 encapsport = 0;
 106         __u16 encapdport = 0;
 107         __u8 metadata = 0;
 108         __u32 fwmark = 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(iptuninfo, IFLA_IPTUN_MAX,
 134                                     linkinfo[IFLA_INFO_DATA]);
 135
 136                 if (iptuninfo[IFLA_IPTUN_LOCAL])
 137                         laddr = rta_getattr_u32(iptuninfo[IFLA_IPTUN_LOCAL]);
 138
 139                 if (iptuninfo[IFLA_IPTUN_REMOTE])
 140                         raddr = rta_getattr_u32(iptuninfo[IFLA_IPTUN_REMOTE]);
 141
 142                 if (iptuninfo[IFLA_IPTUN_TTL])
 143                         ttl = rta_getattr_u8(iptuninfo[IFLA_IPTUN_TTL]);
 144
 145                 if (iptuninfo[IFLA_IPTUN_TOS])
 146                         tos = rta_getattr_u8(iptuninfo[IFLA_IPTUN_TOS]);
 147
 148                 if (iptuninfo[IFLA_IPTUN_PMTUDISC])
 149                         pmtudisc =
 150                                 rta_getattr_u8(iptuninfo[IFLA_IPTUN_PMTUDISC]);
 151
 152                 if (iptuninfo[IFLA_IPTUN_FLAGS])
 153                         iflags = rta_getattr_u16(iptuninfo[IFLA_IPTUN_FLAGS]);
 154
 155                 if (iptuninfo[IFLA_IPTUN_LINK])
 156                         link = rta_getattr_u32(iptuninfo[IFLA_IPTUN_LINK]);
 157
 158                 if (iptuninfo[IFLA_IPTUN_PROTO])
 159                         proto = rta_getattr_u8(iptuninfo[IFLA_IPTUN_PROTO]);
 160
 161                 if (iptuninfo[IFLA_IPTUN_ENCAP_TYPE])
 162                         encaptype = rta_getattr_u16(iptuninfo[IFLA_IPTUN_ENCAP_TYPE]);
 163                 if (iptuninfo[IFLA_IPTUN_ENCAP_FLAGS])
 164                         encapflags = rta_getattr_u16(iptuninfo[IFLA_IPTUN_ENCAP_FLAGS]);
 165                 if (iptuninfo[IFLA_IPTUN_ENCAP_SPORT])
 166                         encapsport = rta_getattr_u16(iptuninfo[IFLA_IPTUN_ENCAP_SPORT]);
 167                 if (iptuninfo[IFLA_IPTUN_ENCAP_DPORT])
 168                         encapdport = rta_getattr_u16(iptuninfo[IFLA_IPTUN_ENCAP_DPORT]);
 169                 if (iptuninfo[IFLA_IPTUN_6RD_PREFIX])
 170                         memcpy(&ip6rdprefix,
 171                                RTA_DATA(iptuninfo[IFLA_IPTUN_6RD_PREFIX]),
 172                                sizeof(laddr));
 173
 174                 if (iptuninfo[IFLA_IPTUN_6RD_PREFIXLEN])
 175                         ip6rdprefixlen =
 176                                 rta_getattr_u16(iptuninfo[IFLA_IPTUN_6RD_PREFIXLEN]);
 177
 178                 if (iptuninfo[IFLA_IPTUN_6RD_RELAY_PREFIX])
 179                         ip6rdrelayprefix =
 180                                 rta_getattr_u32(iptuninfo[IFLA_IPTUN_6RD_RELAY_PREFIX]);
 181
 182                 if (iptuninfo[IFLA_IPTUN_6RD_RELAY_PREFIXLEN])
 183                         ip6rdrelayprefixlen =
 184                                 rta_getattr_u16(iptuninfo[IFLA_IPTUN_6RD_RELAY_PREFIXLEN]);
 185                 if (iptuninfo[IFLA_IPTUN_COLLECT_METADATA])
 186                         metadata = 1;
 187
 188                 if (iptuninfo[IFLA_IPTUN_FWMARK])
 189                         fwmark = rta_getattr_u32(iptuninfo[IFLA_IPTUN_FWMARK]);
 190
 191                 free(answer);
 192         }
 193
 194         while (argc > 0) {
 195                 if (strcmp(*argv, "remote") == 0) {
 196                         NEXT_ARG();
 197                         raddr = get_addr32(*argv);
 198                 } else if (strcmp(*argv, "local") == 0) {
 199                         NEXT_ARG();
 200                         laddr = get_addr32(*argv);
 201                 } else if (matches(*argv, "dev") == 0) {
 202                         NEXT_ARG();
 203                         link = if_nametoindex(*argv);
 204                         if (link == 0)
 205                                 invarg("\"dev\" is invalid", *argv);
 206                 } else if (strcmp(*argv, "ttl") == 0 ||
 207                            strcmp(*argv, "hoplimit") == 0) {
 208                         NEXT_ARG();
 209                         if (strcmp(*argv, "inherit") != 0) {
 210                                 if (get_u8(&ttl, *argv, 0))
 211                                         invarg("invalid TTL\n", *argv);
 212                         } else
 213                                 ttl = 0;
 214                 } else if (strcmp(*argv, "tos") == 0 ||
 215                            strcmp(*argv, "tclass") == 0 ||
 216                            matches(*argv, "dsfield") == 0) {
 217                         __u32 uval;
 218
 219                         NEXT_ARG();
 220                         if (strcmp(*argv, "inherit") != 0) {
 221                                 if (rtnl_dsfield_a2n(&uval, *argv))
 222                                         invarg("bad TOS value", *argv);
 223                                 tos = uval;
 224                         } else
 225                                 tos = 1;
 226                 } else if (strcmp(*argv, "nopmtudisc") == 0) {
 227                         pmtudisc = 0;
 228                 } else if (strcmp(*argv, "pmtudisc") == 0) {
 229                         pmtudisc = 1;
 230                 } else if (strcmp(lu->id, "sit") == 0 &&
 231                            strcmp(*argv, "isatap") == 0) {
 232                         iflags |= SIT_ISATAP;
 233                 } else if (strcmp(*argv, "mode") == 0) {
 234                         NEXT_ARG();
 235                         if (strcmp(lu->id, "sit") == 0 &&
 236                             (strcmp(*argv, "ipv6/ipv4") == 0 ||
 237                              strcmp(*argv, "ip6ip") == 0))
 238                                 proto = IPPROTO_IPV6;
 239                         else if (strcmp(*argv, "ipv4/ipv4") == 0 ||
 240                                  strcmp(*argv, "ipip") == 0 ||
 241                                  strcmp(*argv, "ip4ip4") == 0)
 242                                 proto = IPPROTO_IPIP;
 243                         else if (strcmp(*argv, "mpls/ipv4") == 0 ||
 244                                    strcmp(*argv, "mplsip") == 0)
 245                                 proto = IPPROTO_MPLS;
 246                         else if (strcmp(*argv, "any/ipv4") == 0 ||
 247                                  strcmp(*argv, "any") == 0)
 248                                 proto = 0;
 249                         else
 250                                 invarg("Cannot guess tunnel mode.", *argv);
 251                 } else if (strcmp(*argv, "noencap") == 0) {
 252                         encaptype = TUNNEL_ENCAP_NONE;
 253                 } else if (strcmp(*argv, "encap") == 0) {
 254                         NEXT_ARG();
 255                         if (strcmp(*argv, "fou") == 0)
 256                                 encaptype = TUNNEL_ENCAP_FOU;
 257                         else if (strcmp(*argv, "gue") == 0)
 258                                 encaptype = TUNNEL_ENCAP_GUE;
 259                         else if (strcmp(*argv, "none") == 0)
 260                                 encaptype = TUNNEL_ENCAP_NONE;
 261                         else
 262                                 invarg("Invalid encap type.", *argv);
 263                 } else if (strcmp(*argv, "encap-sport") == 0) {
 264                         NEXT_ARG();
 265                         if (strcmp(*argv, "auto") == 0)
 266                                 encapsport = 0;
 267                         else if (get_u16(&encapsport, *argv, 0))
 268                                 invarg("Invalid source port.", *argv);
 269                 } else if (strcmp(*argv, "encap-dport") == 0) {
 270                         NEXT_ARG();
 271                         if (get_u16(&encapdport, *argv, 0))
 272                                 invarg("Invalid destination port.", *argv);
 273                 } else if (strcmp(*argv, "encap-csum") == 0) {
 274                         encapflags |= TUNNEL_ENCAP_FLAG_CSUM;
 275                 } else if (strcmp(*argv, "noencap-csum") == 0) {
 276                         encapflags &= ~TUNNEL_ENCAP_FLAG_CSUM;
 277                 } else if (strcmp(*argv, "encap-udp6-csum") == 0) {
 278                         encapflags |= TUNNEL_ENCAP_FLAG_CSUM6;
 279                 } else if (strcmp(*argv, "noencap-udp6-csum") == 0) {
 280                         encapflags &= ~TUNNEL_ENCAP_FLAG_CSUM6;
 281                 } else if (strcmp(*argv, "encap-remcsum") == 0) {
 282                         encapflags |= TUNNEL_ENCAP_FLAG_REMCSUM;
 283                 } else if (strcmp(*argv, "noencap-remcsum") == 0) {
 284                         encapflags &= ~TUNNEL_ENCAP_FLAG_REMCSUM;
 285                 } else if (strcmp(*argv, "external") == 0) {
 286                         metadata = 1;
 287                 } else if (strcmp(*argv, "6rd-prefix") == 0) {
 288                         inet_prefix prefix;
 289
 290                         NEXT_ARG();
 291                         if (get_prefix(&prefix, *argv, AF_INET6))
 292                                 invarg("invalid 6rd_prefix\n", *argv);
 293                         memcpy(&ip6rdprefix, prefix.data, 16);
 294                         ip6rdprefixlen = prefix.bitlen;
 295                 } else if (strcmp(*argv, "6rd-relay_prefix") == 0) {
 296                         inet_prefix prefix;
 297
 298                         NEXT_ARG();
 299                         if (get_prefix(&prefix, *argv, AF_INET))
 300                                 invarg("invalid 6rd-relay_prefix\n", *argv);
 301                         memcpy(&ip6rdrelayprefix, prefix.data, 4);
 302                         ip6rdrelayprefixlen = prefix.bitlen;
 303                 } else if (strcmp(*argv, "6rd-reset") == 0) {
 304                         inet_prefix prefix;
 305
 306                         get_prefix(&prefix, "2002::", AF_INET6);
 307                         memcpy(&ip6rdprefix, prefix.data, 16);
 308                         ip6rdprefixlen = 16;
 309                         ip6rdrelayprefix = 0;
 310                         ip6rdrelayprefixlen = 0;
 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
 316                         usage(strcmp(lu->id, "sit") == 0);
 317                 argc--, argv++;
 318         }
 319
 320         if (ttl && pmtudisc == 0) {
 321                 fprintf(stderr, "ttl != 0 and nopmtudisc are incompatible\n");
 322                 exit(-1);
 323         }
 324
 325         addattr8(n, 1024, IFLA_IPTUN_PROTO, proto);
 326         if (metadata) {
 327                 addattr_l(n, 1024, IFLA_IPTUN_COLLECT_METADATA, NULL, 0);
 328                 return 0;
 329         }
 330
 331         addattr32(n, 1024, IFLA_IPTUN_LINK, link);
 332         addattr32(n, 1024, IFLA_IPTUN_LOCAL, laddr);
 333         addattr32(n, 1024, IFLA_IPTUN_REMOTE, raddr);
 334         addattr8(n, 1024, IFLA_IPTUN_TTL, ttl);
 335         addattr8(n, 1024, IFLA_IPTUN_TOS, tos);
 336         addattr8(n, 1024, IFLA_IPTUN_PMTUDISC, pmtudisc);
 337         addattr32(n, 1024, IFLA_IPTUN_FWMARK, fwmark);
 338
 339         addattr16(n, 1024, IFLA_IPTUN_ENCAP_TYPE, encaptype);
 340         addattr16(n, 1024, IFLA_IPTUN_ENCAP_FLAGS, encapflags);
 341         addattr16(n, 1024, IFLA_IPTUN_ENCAP_SPORT, htons(encapsport));
 342         addattr16(n, 1024, IFLA_IPTUN_ENCAP_DPORT, htons(encapdport));
 343
 344         if (strcmp(lu->id, "sit") == 0) {
 345                 addattr16(n, 1024, IFLA_IPTUN_FLAGS, iflags);
 346                 if (ip6rdprefixlen) {
 347                         addattr_l(n, 1024, IFLA_IPTUN_6RD_PREFIX,
 348                                   &ip6rdprefix, sizeof(ip6rdprefix));
 349                         addattr16(n, 1024, IFLA_IPTUN_6RD_PREFIXLEN,
 350                                   ip6rdprefixlen);
 351                         addattr32(n, 1024, IFLA_IPTUN_6RD_RELAY_PREFIX,
 352                                   ip6rdrelayprefix);
 353                         addattr16(n, 1024, IFLA_IPTUN_6RD_RELAY_PREFIXLEN,
 354                                   ip6rdrelayprefixlen);
 355                 }
 356         }
 357
 358         return 0;
 359 }
 360
 361 static void iptunnel_print_opt(struct link_util *lu, FILE *f, struct rtattr *tb[])
 362 {
 363         char s1[1024];
 364         char s2[64];
 365         const char *local = "any";
 366         const char *remote = "any";
 367         __u16 prefixlen, type;
 368
 369         if (!tb)
 370                 return;
 371
 372         if (tb[IFLA_IPTUN_COLLECT_METADATA])
 373                 print_bool(PRINT_ANY, "external", "external ", true);
 374
 375         if (tb[IFLA_IPTUN_REMOTE]) {
 376                 unsigned int addr = rta_getattr_u32(tb[IFLA_IPTUN_REMOTE]);
 377
 378                 if (addr)
 379                         remote = format_host(AF_INET, 4, &addr);
 380         }
 381
 382         print_string(PRINT_ANY, "remote", "remote %s ", remote);
 383
 384         if (tb[IFLA_IPTUN_LOCAL]) {
 385                 unsigned int addr = rta_getattr_u32(tb[IFLA_IPTUN_LOCAL]);
 386
 387                 if (addr)
 388                         local = format_host(AF_INET, 4, &addr);
 389         }
 390
 391         print_string(PRINT_ANY, "local", "local %s ", local);
 392
 393         if (tb[IFLA_IPTUN_LINK] && rta_getattr_u32(tb[IFLA_IPTUN_LINK])) {
 394                 unsigned int link = rta_getattr_u32(tb[IFLA_IPTUN_LINK]);
 395                 const char *n = if_indextoname(link, s2);
 396
 397                 if (n)
 398                         print_string(PRINT_ANY, "link", "dev %s ", n);
 399                 else
 400                         print_int(PRINT_ANY, "link_index", "dev %u ", link);
 401         }
 402
 403         if (tb[IFLA_IPTUN_TTL]) {
 404                 __u8 ttl = rta_getattr_u8(tb[IFLA_IPTUN_TTL]);
 405
 406                 if (ttl)
 407                         print_int(PRINT_ANY, "ttl", "ttl %d ", ttl);
 408                 else
 409                         print_int(PRINT_JSON, "ttl", NULL, ttl);
 410         } else {
 411                 print_string(PRINT_FP, NULL, "ttl %s ", "inherit");
 412         }
 413
 414         if (tb[IFLA_IPTUN_TOS]) {
 415                 int tos = rta_getattr_u8(tb[IFLA_IPTUN_TOS]);
 416
 417                 if (tos) {
 418                         if (is_json_context()) {
 419                                 print_0xhex(PRINT_JSON, "tos", "%#x", tos);
 420                         } else {
 421                                 fputs("tos ", f);
 422                                 if (tos == 1)
 423                                         fputs("inherit ", f);
 424                                 else
 425                                         fprintf(f, "0x%x ", tos);
 426                         }
 427                 }
 428         }
 429
 430         if (tb[IFLA_IPTUN_PMTUDISC] && rta_getattr_u8(tb[IFLA_IPTUN_PMTUDISC]))
 431                 print_bool(PRINT_ANY, "pmtudisc", "pmtudisc ", true);
 432         else
 433                 print_bool(PRINT_ANY, "pmtudisc", "nopmtudisc ", false);
 434
 435         if (tb[IFLA_IPTUN_FLAGS]) {
 436                 __u16 iflags = rta_getattr_u16(tb[IFLA_IPTUN_FLAGS]);
 437
 438                 if (iflags & SIT_ISATAP)
 439                         print_bool(PRINT_ANY, "isatap", "isatap ", true);
 440         }
 441
 442         if (tb[IFLA_IPTUN_6RD_PREFIXLEN] &&
 443             (prefixlen = rta_getattr_u16(tb[IFLA_IPTUN_6RD_PREFIXLEN]))) {
 444                 __u16 relayprefixlen =
 445                         rta_getattr_u16(tb[IFLA_IPTUN_6RD_RELAY_PREFIXLEN]);
 446                 __u32 relayprefix =
 447                         rta_getattr_u32(tb[IFLA_IPTUN_6RD_RELAY_PREFIX]);
 448
 449                 const char *prefix = inet_ntop(AF_INET6,
 450                                                RTA_DATA(tb[IFLA_IPTUN_6RD_PREFIX]),
 451                                                s1, sizeof(s1));
 452
 453                 if (is_json_context()) {
 454                         print_string(PRINT_JSON, "prefix", NULL, prefix);
 455                         print_int(PRINT_JSON, "prefixlen", NULL, prefixlen);
 456                         if (relayprefix) {
 457                                 print_string(PRINT_JSON,
 458                                              "relay_prefix",
 459                                              NULL,
 460                                              format_host(AF_INET,
 461                                                          4,
 462                                                          &relayprefix));
 463                                 print_int(PRINT_JSON,
 464                                           "relay_prefixlen",
 465                                           NULL,
 466                                           relayprefixlen);
 467                         }
 468                 } else {
 469                         printf("6rd-prefix %s/%u ", prefix, prefixlen);
 470                         if (relayprefix) {
 471                                 printf("6rd-relay_prefix %s/%u ",
 472                                        format_host(AF_INET, 4, &relayprefix),
 473                                        relayprefixlen);
 474                         }
 475                 }
 476         }
 477
 478         if (tb[IFLA_IPTUN_ENCAP_TYPE] &&
 479             (type = rta_getattr_u16(tb[IFLA_IPTUN_ENCAP_TYPE])) != TUNNEL_ENCAP_NONE) {
 480                 __u16 flags = rta_getattr_u16(tb[IFLA_IPTUN_ENCAP_FLAGS]);
 481                 __u16 sport = rta_getattr_u16(tb[IFLA_IPTUN_ENCAP_SPORT]);
 482                 __u16 dport = rta_getattr_u16(tb[IFLA_IPTUN_ENCAP_DPORT]);
 483
 484                 print_string(PRINT_FP, NULL, "encap ", NULL);
 485                 switch (type) {
 486                 case TUNNEL_ENCAP_FOU:
 487                         print_string(PRINT_ANY, "type", "%s ", "fou");
 488                         break;
 489                 case TUNNEL_ENCAP_GUE:
 490                         print_string(PRINT_ANY, "type", "%s ", "gue");
 491                         break;
 492                 default:
 493                         print_null(PRINT_ANY, "type", "unknown ", NULL);
 494                         break;
 495                 }
 496
 497                 if (is_json_context()) {
 498                         print_uint(PRINT_JSON,
 499                                    "sport",
 500                                    NULL,
 501                                    sport ? ntohs(sport) : 0);
 502                         print_uint(PRINT_JSON, "dport", NULL, ntohs(dport));
 503                         print_bool(PRINT_JSON,
 504                                    "csum",
 505                                    NULL,
 506                                    flags & TUNNEL_ENCAP_FLAG_CSUM);
 507                         print_bool(PRINT_JSON,
 508                                    "csum6",
 509                                    NULL,
 510                                    flags & TUNNEL_ENCAP_FLAG_CSUM6);
 511                         print_bool(PRINT_JSON,
 512                                    "remcsum",
 513                                    NULL,
 514                                    flags & TUNNEL_ENCAP_FLAG_REMCSUM);
 515                         close_json_object();
 516                 } else {
 517                         if (sport == 0)
 518                                 fputs("encap-sport auto ", f);
 519                         else
 520                                 fprintf(f, "encap-sport %u", ntohs(sport));
 521
 522                         fprintf(f, "encap-dport %u ", ntohs(dport));
 523
 524                         if (flags & TUNNEL_ENCAP_FLAG_CSUM)
 525                                 fputs("encap-csum ", f);
 526                         else
 527                                 fputs("noencap-csum ", f);
 528
 529                         if (flags & TUNNEL_ENCAP_FLAG_CSUM6)
 530                                 fputs("encap-csum6 ", f);
 531                         else
 532                                 fputs("noencap-csum6 ", f);
 533
 534                         if (flags & TUNNEL_ENCAP_FLAG_REMCSUM)
 535                                 fputs("encap-remcsum ", f);
 536                         else
 537                                 fputs("noencap-remcsum ", f);
 538                 }
 539         }
 540
 541         if (tb[IFLA_IPTUN_FWMARK]) {
 542                 __u32 fwmark = rta_getattr_u32(tb[IFLA_IPTUN_FWMARK]);
 543
 544                 if (fwmark) {
 545                         snprintf(s2, sizeof(s2), "0x%x", fwmark);
 546
 547                         print_string(PRINT_ANY, "fwmark", "fwmark %s ", s2);
 548                 }
 549         }
 550 }
 551
 552 static void iptunnel_print_help(struct link_util *lu, int argc, char **argv,
 553         FILE *f)
 554 {
 555         print_usage(f, strcmp(lu->id, "sit") == 0);
 556 }
 557
 558 struct link_util ipip_link_util = {
 559         .id = "ipip",
 560         .maxattr = IFLA_IPTUN_MAX,
 561         .parse_opt = iptunnel_parse_opt,
 562         .print_opt = iptunnel_print_opt,
 563         .print_help = iptunnel_print_help,
 564 };
 565
 566 struct link_util sit_link_util = {
 567         .id = "sit",
 568         .maxattr = IFLA_IPTUN_MAX,
 569         .parse_opt = iptunnel_parse_opt,
 570         .print_opt = iptunnel_print_opt,
 571         .print_help = iptunnel_print_help,
 572 };