ip/iptunnel.c

   1 /*
   2  * iptunnel.c          "ip tunnel"
   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:     Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
  10  *
  11  */
  12
  13 #include <stdio.h>
  14 #include <stdlib.h>
  15 #include <string.h>
  16 #include <unistd.h>
  17 #include <sys/types.h>
  18 #include <sys/socket.h>
  19 #include <arpa/inet.h>
  20 #include <sys/ioctl.h>
  21 #include <net/if.h>
  22 #include <net/if_arp.h>
  23 #include <linux/ip.h>
  24 #include <linux/if_tunnel.h>
  25
  26 #include "rt_names.h"
  27 #include "utils.h"
  28 #include "ip_common.h"
  29 #include "tunnel.h"
  30
  31 static void usage(void) __attribute__((noreturn));
  32
  33 static void usage(void)
  34 {
  35         fprintf(stderr, "Usage: ip tunnel { add | change | del | show | prl | 6rd } [ NAME ]\n");
  36         fprintf(stderr, "          [ mode { ipip | gre | sit | isatap | vti } ] [ remote ADDR ] [ local ADDR ]\n");
  37         fprintf(stderr, "          [ [i|o]seq ] [ [i|o]key KEY ] [ [i|o]csum ]\n");
  38         fprintf(stderr, "          [ prl-default ADDR ] [ prl-nodefault ADDR ] [ prl-delete ADDR ]\n");
  39         fprintf(stderr, "          [ 6rd-prefix ADDR ] [ 6rd-relay_prefix ADDR ] [ 6rd-reset ]\n");
  40         fprintf(stderr, "          [ ttl TTL ] [ tos TOS ] [ [no]pmtudisc ] [ dev PHYS_DEV ]\n");
  41         fprintf(stderr, "\n");
  42         fprintf(stderr, "Where: NAME := STRING\n");
  43         fprintf(stderr, "       ADDR := { IP_ADDRESS | any }\n");
  44         fprintf(stderr, "       TOS  := { STRING | 00..ff | inherit | inherit/STRING | inherit/00..ff }\n");
  45         fprintf(stderr, "       TTL  := { 1..255 | inherit }\n");
  46         fprintf(stderr, "       KEY  := { DOTTED_QUAD | NUMBER }\n");
  47         exit(-1);
  48 }
  49
  50 static int parse_args(int argc, char **argv, int cmd, struct ip_tunnel_parm *p)
  51 {
  52         int count = 0;
  53         char medium[IFNAMSIZ];
  54         int isatap = 0;
  55
  56         memset(p, 0, sizeof(*p));
  57         memset(&medium, 0, sizeof(medium));
  58
  59         p->iph.version = 4;
  60         p->iph.ihl = 5;
  61 #ifndef IP_DF
  62 #define IP_DF           0x4000          /* Flag: "Don't Fragment"       */
  63 #endif
  64         p->iph.frag_off = htons(IP_DF);
  65
  66         while (argc > 0) {
  67                 if (strcmp(*argv, "mode") == 0) {
  68                         NEXT_ARG();
  69                         if (strcmp(*argv, "ipip") == 0 ||
  70                             strcmp(*argv, "ip/ip") == 0) {
  71                                 if (p->iph.protocol && p->iph.protocol != IPPROTO_IPIP) {
  72                                         fprintf(stderr,"You managed to ask for more than one tunnel mode.\n");
  73                                         exit(-1);
  74                                 }
  75                                 p->iph.protocol = IPPROTO_IPIP;
  76                         } else if (strcmp(*argv, "gre") == 0 ||
  77                                    strcmp(*argv, "gre/ip") == 0) {
  78                                 if (p->iph.protocol && p->iph.protocol != IPPROTO_GRE) {
  79                                         fprintf(stderr,"You managed to ask for more than one tunnel mode.\n");
  80                                         exit(-1);
  81                                 }
  82                                 p->iph.protocol = IPPROTO_GRE;
  83                         } else if (strcmp(*argv, "sit") == 0 ||
  84                                    strcmp(*argv, "ipv6/ip") == 0) {
  85                                 if (p->iph.protocol && p->iph.protocol != IPPROTO_IPV6) {
  86                                         fprintf(stderr,"You managed to ask for more than one tunnel mode.\n");
  87                                         exit(-1);
  88                                 }
  89                                 p->iph.protocol = IPPROTO_IPV6;
  90                         } else if (strcmp(*argv, "isatap") == 0) {
  91                                 if (p->iph.protocol && p->iph.protocol != IPPROTO_IPV6) {
  92                                         fprintf(stderr, "You managed to ask for more than one tunnel mode.\n");
  93                                         exit(-1);
  94                                 }
  95                                 p->iph.protocol = IPPROTO_IPV6;
  96                                 isatap++;
  97                         } else if (strcmp(*argv, "vti") == 0) {
  98                                 if (p->iph.protocol && p->iph.protocol != IPPROTO_IPIP) {
  99                                         fprintf(stderr, "You managed to ask for more than one tunnel mode.\n");
 100                                         exit(-1);
 101                                 }
 102                                 p->iph.protocol = IPPROTO_IPIP;
 103                                 p->i_flags |= VTI_ISVTI;
 104                         } else {
 105                                 fprintf(stderr,"Unknown tunnel mode \"%s\"\n", *argv);
 106                                 exit(-1);
 107                         }
 108                 } else if (strcmp(*argv, "key") == 0) {
 109                         NEXT_ARG();
 110                         p->i_flags |= GRE_KEY;
 111                         p->o_flags |= GRE_KEY;
 112                         p->i_key = p->o_key = tnl_parse_key("key", *argv);
 113                 } else if (strcmp(*argv, "ikey") == 0) {
 114                         NEXT_ARG();
 115                         p->i_flags |= GRE_KEY;
 116                         p->i_key = tnl_parse_key("ikey", *argv);
 117                 } else if (strcmp(*argv, "okey") == 0) {
 118                         NEXT_ARG();
 119                         p->o_flags |= GRE_KEY;
 120                         p->o_key = tnl_parse_key("okey", *argv);
 121                 } else if (strcmp(*argv, "seq") == 0) {
 122                         p->i_flags |= GRE_SEQ;
 123                         p->o_flags |= GRE_SEQ;
 124                 } else if (strcmp(*argv, "iseq") == 0) {
 125                         p->i_flags |= GRE_SEQ;
 126                 } else if (strcmp(*argv, "oseq") == 0) {
 127                         p->o_flags |= GRE_SEQ;
 128                 } else if (strcmp(*argv, "csum") == 0) {
 129                         p->i_flags |= GRE_CSUM;
 130                         p->o_flags |= GRE_CSUM;
 131                 } else if (strcmp(*argv, "icsum") == 0) {
 132                         p->i_flags |= GRE_CSUM;
 133                 } else if (strcmp(*argv, "ocsum") == 0) {
 134                         p->o_flags |= GRE_CSUM;
 135                 } else if (strcmp(*argv, "nopmtudisc") == 0) {
 136                         p->iph.frag_off = 0;
 137                 } else if (strcmp(*argv, "pmtudisc") == 0) {
 138                         p->iph.frag_off = htons(IP_DF);
 139                 } else if (strcmp(*argv, "remote") == 0) {
 140                         NEXT_ARG();
 141                         if (strcmp(*argv, "any"))
 142                                 p->iph.daddr = get_addr32(*argv);
 143                         else
 144                                 p->iph.daddr = htonl(INADDR_ANY);
 145                 } else if (strcmp(*argv, "local") == 0) {
 146                         NEXT_ARG();
 147                         if (strcmp(*argv, "any"))
 148                                 p->iph.saddr = get_addr32(*argv);
 149                         else
 150                                 p->iph.saddr = htonl(INADDR_ANY);
 151                 } else if (strcmp(*argv, "dev") == 0) {
 152                         NEXT_ARG();
 153                         strncpy(medium, *argv, IFNAMSIZ-1);
 154                 } else if (strcmp(*argv, "ttl") == 0 ||
 155                            strcmp(*argv, "hoplimit") == 0) {
 156                         unsigned uval;
 157                         NEXT_ARG();
 158                         if (strcmp(*argv, "inherit") != 0) {
 159                                 if (get_unsigned(&uval, *argv, 0))
 160                                         invarg("invalid TTL\n", *argv);
 161                                 if (uval > 255)
 162                                         invarg("TTL must be <=255\n", *argv);
 163                                 p->iph.ttl = uval;
 164                         }
 165                 } else if (strcmp(*argv, "tos") == 0 ||
 166                            strcmp(*argv, "tclass") == 0 ||
 167                            matches(*argv, "dsfield") == 0) {
 168                         char *dsfield;
 169                         __u32 uval;
 170                         NEXT_ARG();
 171                         dsfield = *argv;
 172                         strsep(&dsfield, "/");
 173                         if (strcmp(*argv, "inherit") != 0) {
 174                                 dsfield = *argv;
 175                                 p->iph.tos = 0;
 176                         } else
 177                                 p->iph.tos = 1;
 178                         if (dsfield) {
 179                                 if (rtnl_dsfield_a2n(&uval, dsfield))
 180                                         invarg("bad TOS value", *argv);
 181                                 p->iph.tos |= uval;
 182                         }
 183                 } else {
 184                         if (strcmp(*argv, "name") == 0) {
 185                                 NEXT_ARG();
 186                         } else if (matches(*argv, "help") == 0)
 187                                 usage();
 188                         if (p->name[0])
 189                                 duparg2("name", *argv);
 190                         strncpy(p->name, *argv, IFNAMSIZ);
 191                         if (cmd == SIOCCHGTUNNEL && count == 0) {
 192                                 struct ip_tunnel_parm old_p;
 193                                 memset(&old_p, 0, sizeof(old_p));
 194                                 if (tnl_get_ioctl(*argv, &old_p))
 195                                         return -1;
 196                                 *p = old_p;
 197                         }
 198                 }
 199                 count++;
 200                 argc--; argv++;
 201         }
 202
 203
 204         if (p->iph.protocol == 0) {
 205                 if (memcmp(p->name, "gre", 3) == 0)
 206                         p->iph.protocol = IPPROTO_GRE;
 207                 else if (memcmp(p->name, "ipip", 4) == 0)
 208                         p->iph.protocol = IPPROTO_IPIP;
 209                 else if (memcmp(p->name, "sit", 3) == 0)
 210                         p->iph.protocol = IPPROTO_IPV6;
 211                 else if (memcmp(p->name, "isatap", 6) == 0) {
 212                         p->iph.protocol = IPPROTO_IPV6;
 213                         isatap++;
 214                 } else if (memcmp(p->name, "vti", 3) == 0) {
 215                         p->iph.protocol = IPPROTO_IPIP;
 216                         p->i_flags |= VTI_ISVTI;
 217                 }
 218         }
 219
 220         if ((p->i_flags & GRE_KEY) || (p->o_flags & GRE_KEY)) {
 221                 if (!(p->i_flags & VTI_ISVTI) &&
 222                     (p->iph.protocol != IPPROTO_GRE)) {
 223                         fprintf(stderr, "Keys are not allowed with ipip and sit tunnels\n");
 224                         return -1;
 225                 }
 226         }
 227
 228         if (medium[0]) {
 229                 p->link = ll_name_to_index(medium);
 230                 if (p->link == 0) {
 231                         fprintf(stderr, "Cannot find device \"%s\"\n", medium);
 232                         return -1;
 233                 }
 234         }
 235
 236         if (p->i_key == 0 && IN_MULTICAST(ntohl(p->iph.daddr))) {
 237                 p->i_key = p->iph.daddr;
 238                 p->i_flags |= GRE_KEY;
 239         }
 240         if (p->o_key == 0 && IN_MULTICAST(ntohl(p->iph.daddr))) {
 241                 p->o_key = p->iph.daddr;
 242                 p->o_flags |= GRE_KEY;
 243         }
 244         if (IN_MULTICAST(ntohl(p->iph.daddr)) && !p->iph.saddr) {
 245                 fprintf(stderr, "A broadcast tunnel requires a source address\n");
 246                 return -1;
 247         }
 248         if (isatap)
 249                 p->i_flags |= SIT_ISATAP;
 250
 251         return 0;
 252 }
 253
 254
 255 static int do_add(int cmd, int argc, char **argv)
 256 {
 257         struct ip_tunnel_parm p;
 258
 259         if (parse_args(argc, argv, cmd, &p) < 0)
 260                 return -1;
 261
 262         if (p.iph.ttl && p.iph.frag_off == 0) {
 263                 fprintf(stderr, "ttl != 0 and nopmtudisc are incompatible\n");
 264                 return -1;
 265         }
 266
 267         switch (p.iph.protocol) {
 268         case IPPROTO_IPIP:
 269                 if (p.i_flags & VTI_ISVTI)
 270                         return tnl_add_ioctl(cmd, "ip_vti0", p.name, &p);
 271                 else
 272                         return tnl_add_ioctl(cmd, "tunl0", p.name, &p);
 273         case IPPROTO_GRE:
 274                 return tnl_add_ioctl(cmd, "gre0", p.name, &p);
 275         case IPPROTO_IPV6:
 276                 return tnl_add_ioctl(cmd, "sit0", p.name, &p);
 277         default:
 278                 fprintf(stderr, "cannot determine tunnel mode (ipip, gre, vti or sit)\n");
 279                 return -1;
 280         }
 281         return -1;
 282 }
 283
 284 static int do_del(int argc, char **argv)
 285 {
 286         struct ip_tunnel_parm p;
 287
 288         if (parse_args(argc, argv, SIOCDELTUNNEL, &p) < 0)
 289                 return -1;
 290
 291         switch (p.iph.protocol) {
 292         case IPPROTO_IPIP:
 293                 if (p.i_flags & VTI_ISVTI)
 294                         return tnl_del_ioctl("ip_vti0", p.name, &p);
 295                 else
 296                         return tnl_del_ioctl("tunl0", p.name, &p);
 297         case IPPROTO_GRE:
 298                 return tnl_del_ioctl("gre0", p.name, &p);
 299         case IPPROTO_IPV6:
 300                 return tnl_del_ioctl("sit0", p.name, &p);
 301         default:
 302                 return tnl_del_ioctl(p.name, p.name, &p);
 303         }
 304         return -1;
 305 }
 306
 307 static void print_tunnel(struct ip_tunnel_parm *p)
 308 {
 309         struct ip_tunnel_6rd ip6rd;
 310         char s1[1024];
 311         char s2[1024];
 312
 313         memset(&ip6rd, 0, sizeof(ip6rd));
 314
 315         /* Do not use format_host() for local addr,
 316          * symbolic name will not be useful.
 317          */
 318         printf("%s: %s/ip remote %s local %s",
 319                p->name,
 320                tnl_strproto(p->iph.protocol),
 321                p->iph.daddr ? format_host(AF_INET, 4, &p->iph.daddr, s1, sizeof(s1)) : "any",
 322                p->iph.saddr ? rt_addr_n2a(AF_INET, 4, &p->iph.saddr, s2, sizeof(s2)) : "any");
 323
 324         if (p->iph.protocol == IPPROTO_IPV6 && (p->i_flags & SIT_ISATAP)) {
 325                 struct ip_tunnel_prl prl[16];
 326                 int i;
 327
 328                 memset(prl, 0, sizeof(prl));
 329                 prl[0].datalen = sizeof(prl) - sizeof(prl[0]);
 330                 prl[0].addr = htonl(INADDR_ANY);
 331
 332                 if (!tnl_prl_ioctl(SIOCGETPRL, p->name, prl))
 333                         for (i = 1; i < sizeof(prl) / sizeof(prl[0]); i++)
 334                 {
 335                         if (prl[i].addr != htonl(INADDR_ANY)) {
 336                                 printf(" %s %s ",
 337                                         (prl[i].flags & PRL_DEFAULT) ? "pdr" : "pr",
 338                                         format_host(AF_INET, 4, &prl[i].addr, s1, sizeof(s1)));
 339                         }
 340                 }
 341         }
 342
 343         if (p->link) {
 344                 const char *n = ll_index_to_name(p->link);
 345                 if (n)
 346                         printf(" dev %s", n);
 347         }
 348
 349         if (p->iph.ttl)
 350                 printf(" ttl %d", p->iph.ttl);
 351         else
 352                 printf(" ttl inherit");
 353
 354         if (p->iph.tos) {
 355                 SPRINT_BUF(b1);
 356                 printf(" tos");
 357                 if (p->iph.tos&1)
 358                         printf(" inherit");
 359                 if (p->iph.tos&~1)
 360                         printf("%c%s ", p->iph.tos&1 ? '/' : ' ',
 361                                rtnl_dsfield_n2a(p->iph.tos&~1, b1, sizeof(b1)));
 362         }
 363
 364         if (!(p->iph.frag_off&htons(IP_DF)))
 365                 printf(" nopmtudisc");
 366
 367         if (p->iph.protocol == IPPROTO_IPV6 && !tnl_ioctl_get_6rd(p->name, &ip6rd) && ip6rd.prefixlen) {
 368                 printf(" 6rd-prefix %s/%u",
 369                        inet_ntop(AF_INET6, &ip6rd.prefix, s1, sizeof(s1)),
 370                        ip6rd.prefixlen);
 371                 if (ip6rd.relay_prefix) {
 372                         printf(" 6rd-relay_prefix %s/%u",
 373                                format_host(AF_INET, 4, &ip6rd.relay_prefix, s1, sizeof(s1)),
 374                                ip6rd.relay_prefixlen);
 375                 }
 376         }
 377
 378         if ((p->i_flags&GRE_KEY) && (p->o_flags&GRE_KEY) && p->o_key == p->i_key)
 379                 printf(" key %u", ntohl(p->i_key));
 380         else if ((p->i_flags|p->o_flags)&GRE_KEY) {
 381                 if (p->i_flags&GRE_KEY)
 382                         printf(" ikey %u", ntohl(p->i_key));
 383                 if (p->o_flags&GRE_KEY)
 384                         printf(" okey %u", ntohl(p->o_key));
 385         }
 386
 387         if (p->i_flags&GRE_SEQ)
 388                 printf("%s  Drop packets out of sequence.", _SL_);
 389         if (p->i_flags&GRE_CSUM)
 390                 printf("%s  Checksum in received packet is required.", _SL_);
 391         if (p->o_flags&GRE_SEQ)
 392                 printf("%s  Sequence packets on output.", _SL_);
 393         if (p->o_flags&GRE_CSUM)
 394                 printf("%s  Checksum output packets.", _SL_);
 395 }
 396
 397 static int do_tunnels_list(struct ip_tunnel_parm *p)
 398 {
 399         char name[IFNAMSIZ];
 400         unsigned long  rx_bytes, rx_packets, rx_errs, rx_drops,
 401         rx_fifo, rx_frame,
 402         tx_bytes, tx_packets, tx_errs, tx_drops,
 403         tx_fifo, tx_colls, tx_carrier, rx_multi;
 404         struct ip_tunnel_parm p1;
 405
 406         char buf[512];
 407         FILE *fp = fopen("/proc/net/dev", "r");
 408         if (fp == NULL) {
 409                 perror("fopen");
 410                 return -1;
 411         }
 412
 413         /* skip header lines */
 414         if (!fgets(buf, sizeof(buf), fp) ||
 415             !fgets(buf, sizeof(buf), fp)) {
 416                 fprintf(stderr, "/proc/net/dev read error\n");
 417                 fclose(fp);
 418                 return -1;
 419         }
 420
 421         while (fgets(buf, sizeof(buf), fp) != NULL) {
 422                 int index, type;
 423                 char *ptr;
 424                 buf[sizeof(buf) - 1] = 0;
 425                 if ((ptr = strchr(buf, ':')) == NULL ||
 426                     (*ptr++ = 0, sscanf(buf, "%s", name) != 1)) {
 427                         fprintf(stderr, "Wrong format for /proc/net/dev. Giving up.\n");
 428                         fclose(fp);
 429                         return -1;
 430                 }
 431                 if (sscanf(ptr, "%ld%ld%ld%ld%ld%ld%ld%*d%ld%ld%ld%ld%ld%ld%ld",
 432                            &rx_bytes, &rx_packets, &rx_errs, &rx_drops,
 433                            &rx_fifo, &rx_frame, &rx_multi,
 434                            &tx_bytes, &tx_packets, &tx_errs, &tx_drops,
 435                            &tx_fifo, &tx_colls, &tx_carrier) != 14)
 436                         continue;
 437                 if (p->name[0] && strcmp(p->name, name))
 438                         continue;
 439                 index = ll_name_to_index(name);
 440                 if (index == 0)
 441                         continue;
 442                 type = ll_index_to_type(index);
 443                 if (type == -1) {
 444                         fprintf(stderr, "Failed to get type of \"%s\"\n", name);
 445                         continue;
 446                 }
 447                 if (type != ARPHRD_TUNNEL && type != ARPHRD_IPGRE && type != ARPHRD_SIT)
 448                         continue;
 449                 memset(&p1, 0, sizeof(p1));
 450                 if (tnl_get_ioctl(name, &p1))
 451                         continue;
 452                 if ((p->link && p1.link != p->link) ||
 453                     (p->name[0] && strcmp(p1.name, p->name)) ||
 454                     (p->iph.daddr && p1.iph.daddr != p->iph.daddr) ||
 455                     (p->iph.saddr && p1.iph.saddr != p->iph.saddr) ||
 456                     (p->i_key && p1.i_key != p->i_key))
 457                         continue;
 458                 print_tunnel(&p1);
 459                 if (show_stats) {
 460                         printf("%s", _SL_);
 461                         printf("RX: Packets    Bytes        Errors CsumErrs OutOfSeq Mcasts%s", _SL_);
 462                         printf("    %-10ld %-12ld %-6ld %-8ld %-8ld %-8ld%s",
 463                                rx_packets, rx_bytes, rx_errs, rx_frame, rx_fifo, rx_multi, _SL_);
 464                         printf("TX: Packets    Bytes        Errors DeadLoop NoRoute  NoBufs%s", _SL_);
 465                         printf("    %-10ld %-12ld %-6ld %-8ld %-8ld %-6ld",
 466                                tx_packets, tx_bytes, tx_errs, tx_colls, tx_carrier, tx_drops);
 467                 }
 468                 printf("\n");
 469         }
 470         fclose(fp);
 471         return 0;
 472 }
 473
 474 static int do_show(int argc, char **argv)
 475 {
 476         int err;
 477         struct ip_tunnel_parm p;
 478
 479         ll_init_map(&rth);
 480         if (parse_args(argc, argv, SIOCGETTUNNEL, &p) < 0)
 481                 return -1;
 482
 483         switch (p.iph.protocol) {
 484         case IPPROTO_IPIP:
 485                 if (p.i_flags & VTI_ISVTI)
 486                         err = tnl_get_ioctl(p.name[0] ? p.name : "ip_vti0", &p);
 487                 else
 488                         err = tnl_get_ioctl(p.name[0] ? p.name : "tunl0", &p);
 489                 break;
 490         case IPPROTO_GRE:
 491                 err = tnl_get_ioctl(p.name[0] ? p.name : "gre0", &p);
 492                 break;
 493         case IPPROTO_IPV6:
 494                 err = tnl_get_ioctl(p.name[0] ? p.name : "sit0", &p);
 495                 break;
 496         default:
 497                 do_tunnels_list(&p);
 498                 return 0;
 499         }
 500         if (err)
 501                 return -1;
 502
 503         print_tunnel(&p);
 504         printf("\n");
 505         return 0;
 506 }
 507
 508 static int do_prl(int argc, char **argv)
 509 {
 510         struct ip_tunnel_prl p;
 511         int count = 0;
 512         int devname = 0;
 513         int cmd = 0;
 514         char medium[IFNAMSIZ];
 515
 516         memset(&p, 0, sizeof(p));
 517         memset(&medium, 0, sizeof(medium));
 518
 519         while (argc > 0) {
 520                 if (strcmp(*argv, "prl-default") == 0) {
 521                         NEXT_ARG();
 522                         cmd = SIOCADDPRL;
 523                         p.addr = get_addr32(*argv);
 524                         p.flags |= PRL_DEFAULT;
 525                         count++;
 526                 } else if (strcmp(*argv, "prl-nodefault") == 0) {
 527                         NEXT_ARG();
 528                         cmd = SIOCADDPRL;
 529                         p.addr = get_addr32(*argv);
 530                         count++;
 531                 } else if (strcmp(*argv, "prl-delete") == 0) {
 532                         NEXT_ARG();
 533                         cmd = SIOCDELPRL;
 534                         p.addr = get_addr32(*argv);
 535                         count++;
 536                 } else if (strcmp(*argv, "dev") == 0) {
 537                         NEXT_ARG();
 538                         strncpy(medium, *argv, IFNAMSIZ-1);
 539                         devname++;
 540                 } else {
 541                         fprintf(stderr,"Invalid PRL parameter \"%s\"\n", *argv);
 542                         exit(-1);
 543                 }
 544                 if (count > 1) {
 545                         fprintf(stderr,"One PRL entry at a time\n");
 546                         exit(-1);
 547                 }
 548                 argc--; argv++;
 549         }
 550         if (devname == 0) {
 551                 fprintf(stderr, "Must specify device\n");
 552                 exit(-1);
 553         }
 554
 555         return tnl_prl_ioctl(cmd, medium, &p);
 556 }
 557
 558 static int do_6rd(int argc, char **argv)
 559 {
 560         struct ip_tunnel_6rd ip6rd;
 561         int devname = 0;
 562         int cmd = 0;
 563         char medium[IFNAMSIZ];
 564         inet_prefix prefix;
 565
 566         memset(&ip6rd, 0, sizeof(ip6rd));
 567         memset(&medium, 0, sizeof(medium));
 568
 569         while (argc > 0) {
 570                 if (strcmp(*argv, "6rd-prefix") == 0) {
 571                         NEXT_ARG();
 572                         if (get_prefix(&prefix, *argv, AF_INET6))
 573                                 invarg("invalid 6rd_prefix\n", *argv);
 574                         cmd = SIOCADD6RD;
 575                         memcpy(&ip6rd.prefix, prefix.data, 16);
 576                         ip6rd.prefixlen = prefix.bitlen;
 577                 } else if (strcmp(*argv, "6rd-relay_prefix") == 0) {
 578                         NEXT_ARG();
 579                         if (get_prefix(&prefix, *argv, AF_INET))
 580                                 invarg("invalid 6rd-relay_prefix\n", *argv);
 581                         cmd = SIOCADD6RD;
 582                         memcpy(&ip6rd.relay_prefix, prefix.data, 4);
 583                         ip6rd.relay_prefixlen = prefix.bitlen;
 584                 } else if (strcmp(*argv, "6rd-reset") == 0) {
 585                         cmd = SIOCDEL6RD;
 586                 } else if (strcmp(*argv, "dev") == 0) {
 587                         NEXT_ARG();
 588                         strncpy(medium, *argv, IFNAMSIZ-1);
 589                         devname++;
 590                 } else {
 591                         fprintf(stderr,"Invalid 6RD parameter \"%s\"\n", *argv);
 592                         exit(-1);
 593                 }
 594                 argc--; argv++;
 595         }
 596         if (devname == 0) {
 597                 fprintf(stderr, "Must specify device\n");
 598                 exit(-1);
 599         }
 600
 601         return tnl_6rd_ioctl(cmd, medium, &ip6rd);
 602 }
 603
 604 int do_iptunnel(int argc, char **argv)
 605 {
 606         switch (preferred_family) {
 607         case AF_UNSPEC:
 608                 preferred_family = AF_INET;
 609                 break;
 610         case AF_INET:
 611                 break;
 612         /*
 613          * This is silly enough but we have no easy way to make it
 614          * protocol-independent because of unarranged structure between
 615          * IPv4 and IPv6.
 616          */
 617         case AF_INET6:
 618                 return do_ip6tunnel(argc, argv);
 619         default:
 620                 fprintf(stderr, "Unsupported protocol family: %d\n", preferred_family);
 621                 exit(-1);
 622         }
 623
 624         if (argc > 0) {
 625                 if (matches(*argv, "add") == 0)
 626                         return do_add(SIOCADDTUNNEL, argc-1, argv+1);
 627                 if (matches(*argv, "change") == 0)
 628                         return do_add(SIOCCHGTUNNEL, argc-1, argv+1);
 629                 if (matches(*argv, "delete") == 0)
 630                         return do_del(argc-1, argv+1);
 631                 if (matches(*argv, "show") == 0 ||
 632                     matches(*argv, "lst") == 0 ||
 633                     matches(*argv, "list") == 0)
 634                         return do_show(argc-1, argv+1);
 635                 if (matches(*argv, "prl") == 0)
 636                         return do_prl(argc-1, argv+1);
 637                 if (matches(*argv, "6rd") == 0)
 638                         return do_6rd(argc-1, argv+1);
 639                 if (matches(*argv, "help") == 0)
 640                         usage();
 641         } else
 642                 return do_show(0, NULL);
 643
 644         fprintf(stderr, "Command \"%s\" is unknown, try \"ip tunnel help\"\n", *argv);
 645         exit(-1);
 646 }