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  := { NUMBER | inherit }\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,"Cannot guess tunnel mode.\n");
 106                                 exit(-1);
 107                         }
 108                 } else if (strcmp(*argv, "key") == 0) {
 109                         unsigned uval;
 110                         NEXT_ARG();
 111                         p->i_flags |= GRE_KEY;
 112                         p->o_flags |= GRE_KEY;
 113                         if (strchr(*argv, '.'))
 114                                 p->i_key = p->o_key = get_addr32(*argv);
 115                         else {
 116                                 if (get_unsigned(&uval, *argv, 0)<0) {
 117                                         fprintf(stderr, "invalid value of \"key\"\n");
 118                                         exit(-1);
 119                                 }
 120                                 p->i_key = p->o_key = htonl(uval);
 121                         }
 122                 } else if (strcmp(*argv, "ikey") == 0) {
 123                         unsigned uval;
 124                         NEXT_ARG();
 125                         p->i_flags |= GRE_KEY;
 126                         if (strchr(*argv, '.'))
 127                                 p->i_key = get_addr32(*argv);
 128                         else {
 129                                 if (get_unsigned(&uval, *argv, 0)<0) {
 130                                         fprintf(stderr, "invalid value of \"ikey\"\n");
 131                                         exit(-1);
 132                                 }
 133                                 p->i_key = htonl(uval);
 134                         }
 135                 } else if (strcmp(*argv, "okey") == 0) {
 136                         unsigned uval;
 137                         NEXT_ARG();
 138                         p->o_flags |= GRE_KEY;
 139                         if (strchr(*argv, '.'))
 140                                 p->o_key = get_addr32(*argv);
 141                         else {
 142                                 if (get_unsigned(&uval, *argv, 0)<0) {
 143                                         fprintf(stderr, "invalid value of \"okey\"\n");
 144                                         exit(-1);
 145                                 }
 146                                 p->o_key = htonl(uval);
 147                         }
 148                 } else if (strcmp(*argv, "seq") == 0) {
 149                         p->i_flags |= GRE_SEQ;
 150                         p->o_flags |= GRE_SEQ;
 151                 } else if (strcmp(*argv, "iseq") == 0) {
 152                         p->i_flags |= GRE_SEQ;
 153                 } else if (strcmp(*argv, "oseq") == 0) {
 154                         p->o_flags |= GRE_SEQ;
 155                 } else if (strcmp(*argv, "csum") == 0) {
 156                         p->i_flags |= GRE_CSUM;
 157                         p->o_flags |= GRE_CSUM;
 158                 } else if (strcmp(*argv, "icsum") == 0) {
 159                         p->i_flags |= GRE_CSUM;
 160                 } else if (strcmp(*argv, "ocsum") == 0) {
 161                         p->o_flags |= GRE_CSUM;
 162                 } else if (strcmp(*argv, "nopmtudisc") == 0) {
 163                         p->iph.frag_off = 0;
 164                 } else if (strcmp(*argv, "pmtudisc") == 0) {
 165                         p->iph.frag_off = htons(IP_DF);
 166                 } else if (strcmp(*argv, "remote") == 0) {
 167                         NEXT_ARG();
 168                         if (strcmp(*argv, "any"))
 169                                 p->iph.daddr = get_addr32(*argv);
 170                 } else if (strcmp(*argv, "local") == 0) {
 171                         NEXT_ARG();
 172                         if (strcmp(*argv, "any"))
 173                                 p->iph.saddr = get_addr32(*argv);
 174                 } else if (strcmp(*argv, "dev") == 0) {
 175                         NEXT_ARG();
 176                         strncpy(medium, *argv, IFNAMSIZ-1);
 177                 } else if (strcmp(*argv, "ttl") == 0 ||
 178                            strcmp(*argv, "hoplimit") == 0) {
 179                         unsigned uval;
 180                         NEXT_ARG();
 181                         if (strcmp(*argv, "inherit") != 0) {
 182                                 if (get_unsigned(&uval, *argv, 0))
 183                                         invarg("invalid TTL\n", *argv);
 184                                 if (uval > 255)
 185                                         invarg("TTL must be <=255\n", *argv);
 186                                 p->iph.ttl = uval;
 187                         }
 188                 } else if (strcmp(*argv, "tos") == 0 ||
 189                            strcmp(*argv, "tclass") == 0 ||
 190                            matches(*argv, "dsfield") == 0) {
 191                         __u32 uval;
 192                         NEXT_ARG();
 193                         if (strcmp(*argv, "inherit") != 0) {
 194                                 if (rtnl_dsfield_a2n(&uval, *argv))
 195                                         invarg("bad TOS value", *argv);
 196                                 p->iph.tos = uval;
 197                         } else
 198                                 p->iph.tos = 1;
 199                 } else {
 200                         if (strcmp(*argv, "name") == 0) {
 201                                 NEXT_ARG();
 202                         } else if (matches(*argv, "help") == 0)
 203                                 usage();
 204                         if (p->name[0])
 205                                 duparg2("name", *argv);
 206                         strncpy(p->name, *argv, IFNAMSIZ);
 207                         if (cmd == SIOCCHGTUNNEL && count == 0) {
 208                                 struct ip_tunnel_parm old_p;
 209                                 memset(&old_p, 0, sizeof(old_p));
 210                                 if (tnl_get_ioctl(*argv, &old_p))
 211                                         return -1;
 212                                 *p = old_p;
 213                         }
 214                 }
 215                 count++;
 216                 argc--; argv++;
 217         }
 218
 219
 220         if (p->iph.protocol == 0) {
 221                 if (memcmp(p->name, "gre", 3) == 0)
 222                         p->iph.protocol = IPPROTO_GRE;
 223                 else if (memcmp(p->name, "ipip", 4) == 0)
 224                         p->iph.protocol = IPPROTO_IPIP;
 225                 else if (memcmp(p->name, "sit", 3) == 0)
 226                         p->iph.protocol = IPPROTO_IPV6;
 227                 else if (memcmp(p->name, "isatap", 6) == 0) {
 228                         p->iph.protocol = IPPROTO_IPV6;
 229                         isatap++;
 230                 } else if (memcmp(p->name, "vti", 3) == 0) {
 231                         p->iph.protocol = IPPROTO_IPIP;
 232                         p->i_flags |= VTI_ISVTI;
 233                 }
 234         }
 235
 236         if (p->iph.protocol == IPPROTO_IPIP || p->iph.protocol == IPPROTO_IPV6) {
 237                 if ((p->i_flags & GRE_KEY) || (p->o_flags & GRE_KEY)) {
 238                         fprintf(stderr, "Keys are not allowed with ipip and sit.\n");
 239                         return -1;
 240                 }
 241         }
 242
 243         if (medium[0]) {
 244                 p->link = if_nametoindex(medium);
 245                 if (p->link == 0)
 246                         return -1;
 247         }
 248
 249         if (p->i_key == 0 && IN_MULTICAST(ntohl(p->iph.daddr))) {
 250                 p->i_key = p->iph.daddr;
 251                 p->i_flags |= GRE_KEY;
 252         }
 253         if (p->o_key == 0 && IN_MULTICAST(ntohl(p->iph.daddr))) {
 254                 p->o_key = p->iph.daddr;
 255                 p->o_flags |= GRE_KEY;
 256         }
 257         if (IN_MULTICAST(ntohl(p->iph.daddr)) && !p->iph.saddr) {
 258                 fprintf(stderr, "Broadcast tunnel requires a source address.\n");
 259                 return -1;
 260         }
 261         if (isatap)
 262                 p->i_flags |= SIT_ISATAP;
 263
 264         return 0;
 265 }
 266
 267
 268 static int do_add(int cmd, int argc, char **argv)
 269 {
 270         struct ip_tunnel_parm p;
 271
 272         if (parse_args(argc, argv, cmd, &p) < 0)
 273                 return -1;
 274
 275         if (p.iph.ttl && p.iph.frag_off == 0) {
 276                 fprintf(stderr, "ttl != 0 and noptmudisc are incompatible\n");
 277                 return -1;
 278         }
 279
 280         switch (p.iph.protocol) {
 281         case IPPROTO_IPIP:
 282                 if (p.i_flags != VTI_ISVTI)
 283                         return tnl_add_ioctl(cmd, "tunl0", p.name, &p);
 284                 else
 285                         return tnl_add_ioctl(cmd, "ip_vti0", p.name, &p);
 286         case IPPROTO_GRE:
 287                 return tnl_add_ioctl(cmd, "gre0", p.name, &p);
 288         case IPPROTO_IPV6:
 289                 return tnl_add_ioctl(cmd, "sit0", p.name, &p);
 290         default:
 291                 fprintf(stderr, "cannot determine tunnel mode (ipip, gre, vti or sit)\n");
 292                 return -1;
 293         }
 294         return -1;
 295 }
 296
 297 static int do_del(int argc, char **argv)
 298 {
 299         struct ip_tunnel_parm p;
 300
 301         if (parse_args(argc, argv, SIOCDELTUNNEL, &p) < 0)
 302                 return -1;
 303
 304         switch (p.iph.protocol) {
 305         case IPPROTO_IPIP:
 306                 if (p.i_flags != VTI_ISVTI)
 307                         return tnl_del_ioctl("tunl0", p.name, &p);
 308                 else
 309                         return tnl_del_ioctl("ip_vti0", p.name, &p);
 310         case IPPROTO_GRE:
 311                 return tnl_del_ioctl("gre0", p.name, &p);
 312         case IPPROTO_IPV6:
 313                 return tnl_del_ioctl("sit0", p.name, &p);
 314         default:
 315                 return tnl_del_ioctl(p.name, p.name, &p);
 316         }
 317         return -1;
 318 }
 319
 320 static void print_tunnel(struct ip_tunnel_parm *p)
 321 {
 322         struct ip_tunnel_6rd ip6rd;
 323         char s1[1024];
 324         char s2[1024];
 325
 326         memset(&ip6rd, 0, sizeof(ip6rd));
 327
 328         /* Do not use format_host() for local addr,
 329          * symbolic name will not be useful.
 330          */
 331         printf("%s: %s/ip  remote %s  local %s ",
 332                p->name,
 333                tnl_strproto(p->iph.protocol),
 334                p->iph.daddr ? format_host(AF_INET, 4, &p->iph.daddr, s1, sizeof(s1))  : "any",
 335                p->iph.saddr ? rt_addr_n2a(AF_INET, 4, &p->iph.saddr, s2, sizeof(s2)) : "any");
 336
 337         if (p->i_flags & SIT_ISATAP) {
 338                 struct ip_tunnel_prl prl[16];
 339                 int i;
 340
 341                 memset(prl, 0, sizeof(prl));
 342                 prl[0].datalen = sizeof(prl) - sizeof(prl[0]);
 343                 prl[0].addr = htonl(INADDR_ANY);
 344
 345                 if (!tnl_prl_ioctl(SIOCGETPRL, p->name, prl))
 346                         for (i = 1; i < sizeof(prl) / sizeof(prl[0]); i++)
 347                 {
 348                         if (prl[i].addr != htonl(INADDR_ANY)) {
 349                                 printf(" %s %s ",
 350                                         (prl[i].flags & PRL_DEFAULT) ? "pdr" : "pr",
 351                                         format_host(AF_INET, 4, &prl[i].addr, s1, sizeof(s1)));
 352                         }
 353                 }
 354         }
 355
 356         if (p->link) {
 357                 const char *n = ll_index_to_name(p->link);
 358                 if (n)
 359                         printf(" dev %s ", n);
 360         }
 361
 362         if (p->iph.ttl)
 363                 printf(" ttl %d ", p->iph.ttl);
 364         else
 365                 printf(" ttl inherit ");
 366
 367         if (p->iph.tos) {
 368                 SPRINT_BUF(b1);
 369                 printf(" tos");
 370                 if (p->iph.tos&1)
 371                         printf(" inherit");
 372                 if (p->iph.tos&~1)
 373                         printf("%c%s ", p->iph.tos&1 ? '/' : ' ',
 374                                rtnl_dsfield_n2a(p->iph.tos&~1, b1, sizeof(b1)));
 375         }
 376
 377         if (!(p->iph.frag_off&htons(IP_DF)))
 378                 printf(" nopmtudisc");
 379
 380         if (p->iph.protocol == IPPROTO_IPV6 && !tnl_ioctl_get_6rd(p->name, &ip6rd) && ip6rd.prefixlen) {
 381                 printf(" 6rd-prefix %s/%u ",
 382                        inet_ntop(AF_INET6, &ip6rd.prefix, s1, sizeof(s1)),
 383                        ip6rd.prefixlen);
 384                 if (ip6rd.relay_prefix) {
 385                         printf("6rd-relay_prefix %s/%u ",
 386                                format_host(AF_INET, 4, &ip6rd.relay_prefix, s1, sizeof(s1)),
 387                                ip6rd.relay_prefixlen);
 388                 }
 389         }
 390
 391         if ((p->i_flags&GRE_KEY) && (p->o_flags&GRE_KEY) && p->o_key == p->i_key)
 392                 printf(" key %u", ntohl(p->i_key));
 393         else if ((p->i_flags|p->o_flags)&GRE_KEY) {
 394                 if (p->i_flags&GRE_KEY)
 395                         printf(" ikey %u ", ntohl(p->i_key));
 396                 if (p->o_flags&GRE_KEY)
 397                         printf(" okey %u ", ntohl(p->o_key));
 398         }
 399
 400         if (p->i_flags&GRE_SEQ)
 401                 printf("%s  Drop packets out of sequence.\n", _SL_);
 402         if (p->i_flags&GRE_CSUM)
 403                 printf("%s  Checksum in received packet is required.", _SL_);
 404         if (p->o_flags&GRE_SEQ)
 405                 printf("%s  Sequence packets on output.", _SL_);
 406         if (p->o_flags&GRE_CSUM)
 407                 printf("%s  Checksum output packets.", _SL_);
 408 }
 409
 410 static int do_tunnels_list(struct ip_tunnel_parm *p)
 411 {
 412         char name[IFNAMSIZ];
 413         unsigned long  rx_bytes, rx_packets, rx_errs, rx_drops,
 414         rx_fifo, rx_frame,
 415         tx_bytes, tx_packets, tx_errs, tx_drops,
 416         tx_fifo, tx_colls, tx_carrier, rx_multi;
 417         struct ip_tunnel_parm p1;
 418
 419         char buf[512];
 420         FILE *fp = fopen("/proc/net/dev", "r");
 421         if (fp == NULL) {
 422                 perror("fopen");
 423                 return -1;
 424         }
 425
 426         /* skip header lines */
 427         if (!fgets(buf, sizeof(buf), fp) ||
 428             !fgets(buf, sizeof(buf), fp)) {
 429                 fprintf(stderr, "/proc/net/dev read error\n");
 430                 fclose(fp);
 431                 return -1;
 432         }
 433
 434         while (fgets(buf, sizeof(buf), fp) != NULL) {
 435                 int index, type;
 436                 char *ptr;
 437                 buf[sizeof(buf) - 1] = 0;
 438                 if ((ptr = strchr(buf, ':')) == NULL ||
 439                     (*ptr++ = 0, sscanf(buf, "%s", name) != 1)) {
 440                         fprintf(stderr, "Wrong format of /proc/net/dev. Sorry.\n");
 441                         fclose(fp);
 442                         return -1;
 443                 }
 444                 if (sscanf(ptr, "%ld%ld%ld%ld%ld%ld%ld%*d%ld%ld%ld%ld%ld%ld%ld",
 445                            &rx_bytes, &rx_packets, &rx_errs, &rx_drops,
 446                            &rx_fifo, &rx_frame, &rx_multi,
 447                            &tx_bytes, &tx_packets, &tx_errs, &tx_drops,
 448                            &tx_fifo, &tx_colls, &tx_carrier) != 14)
 449                         continue;
 450                 if (p->name[0] && strcmp(p->name, name))
 451                         continue;
 452                 index = ll_name_to_index(name);
 453                 if (index == 0)
 454                         continue;
 455                 type = ll_index_to_type(index);
 456                 if (type == -1) {
 457                         fprintf(stderr, "Failed to get type of [%s]\n", name);
 458                         continue;
 459                 }
 460                 if (type != ARPHRD_TUNNEL && type != ARPHRD_IPGRE && type != ARPHRD_SIT)
 461                         continue;
 462                 memset(&p1, 0, sizeof(p1));
 463                 if (tnl_get_ioctl(name, &p1))
 464                         continue;
 465                 if ((p->link && p1.link != p->link) ||
 466                     (p->name[0] && strcmp(p1.name, p->name)) ||
 467                     (p->iph.daddr && p1.iph.daddr != p->iph.daddr) ||
 468                     (p->iph.saddr && p1.iph.saddr != p->iph.saddr) ||
 469                     (p->i_key && p1.i_key != p->i_key))
 470                         continue;
 471                 print_tunnel(&p1);
 472                 if (show_stats) {
 473                         printf("%s", _SL_);
 474                         printf("RX: Packets    Bytes        Errors CsumErrs OutOfSeq Mcasts%s", _SL_);
 475                         printf("    %-10ld %-12ld %-6ld %-8ld %-8ld %-8ld%s",
 476                                rx_packets, rx_bytes, rx_errs, rx_frame, rx_fifo, rx_multi, _SL_);
 477                         printf("TX: Packets    Bytes        Errors DeadLoop NoRoute  NoBufs%s", _SL_);
 478                         printf("    %-10ld %-12ld %-6ld %-8ld %-8ld %-6ld",
 479                                tx_packets, tx_bytes, tx_errs, tx_colls, tx_carrier, tx_drops);
 480                 }
 481                 printf("\n");
 482         }
 483         fclose(fp);
 484         return 0;
 485 }
 486
 487 static int do_show(int argc, char **argv)
 488 {
 489         int err;
 490         struct ip_tunnel_parm p;
 491
 492         ll_init_map(&rth);
 493         if (parse_args(argc, argv, SIOCGETTUNNEL, &p) < 0)
 494                 return -1;
 495
 496         switch (p.iph.protocol) {
 497         case IPPROTO_IPIP:
 498                 if (p.i_flags != VTI_ISVTI)
 499                         err = tnl_get_ioctl(p.name[0] ? p.name : "tunl0", &p);
 500                 else
 501                         err = tnl_get_ioctl(p.name[0] ? p.name : "ip_vti0", &p);
 502                 break;
 503         case IPPROTO_GRE:
 504                 err = tnl_get_ioctl(p.name[0] ? p.name : "gre0", &p);
 505                 break;
 506         case IPPROTO_IPV6:
 507                 err = tnl_get_ioctl(p.name[0] ? p.name : "sit0", &p);
 508                 break;
 509         default:
 510                 do_tunnels_list(&p);
 511                 return 0;
 512         }
 513         if (err)
 514                 return -1;
 515
 516         print_tunnel(&p);
 517         printf("\n");
 518         return 0;
 519 }
 520
 521 static int do_prl(int argc, char **argv)
 522 {
 523         struct ip_tunnel_prl p;
 524         int count = 0;
 525         int devname = 0;
 526         int cmd = 0;
 527         char medium[IFNAMSIZ];
 528
 529         memset(&p, 0, sizeof(p));
 530         memset(&medium, 0, sizeof(medium));
 531
 532         while (argc > 0) {
 533                 if (strcmp(*argv, "prl-default") == 0) {
 534                         NEXT_ARG();
 535                         cmd = SIOCADDPRL;
 536                         p.addr = get_addr32(*argv);
 537                         p.flags |= PRL_DEFAULT;
 538                         count++;
 539                 } else if (strcmp(*argv, "prl-nodefault") == 0) {
 540                         NEXT_ARG();
 541                         cmd = SIOCADDPRL;
 542                         p.addr = get_addr32(*argv);
 543                         count++;
 544                 } else if (strcmp(*argv, "prl-delete") == 0) {
 545                         NEXT_ARG();
 546                         cmd = SIOCDELPRL;
 547                         p.addr = get_addr32(*argv);
 548                         count++;
 549                 } else if (strcmp(*argv, "dev") == 0) {
 550                         NEXT_ARG();
 551                         strncpy(medium, *argv, IFNAMSIZ-1);
 552                         devname++;
 553                 } else {
 554                         fprintf(stderr,"%s: Invalid PRL parameter.\n", *argv);
 555                         exit(-1);
 556                 }
 557                 if (count > 1) {
 558                         fprintf(stderr,"One PRL entry at a time.\n");
 559                         exit(-1);
 560                 }
 561                 argc--; argv++;
 562         }
 563         if (devname == 0) {
 564                 fprintf(stderr, "Must specify dev.\n");
 565                 exit(-1);
 566         }
 567
 568         return tnl_prl_ioctl(cmd, medium, &p);
 569 }
 570
 571 static int do_6rd(int argc, char **argv)
 572 {
 573         struct ip_tunnel_6rd ip6rd;
 574         int devname = 0;
 575         int cmd = 0;
 576         char medium[IFNAMSIZ];
 577         inet_prefix prefix;
 578
 579         memset(&ip6rd, 0, sizeof(ip6rd));
 580         memset(&medium, 0, sizeof(medium));
 581
 582         while (argc > 0) {
 583                 if (strcmp(*argv, "6rd-prefix") == 0) {
 584                         NEXT_ARG();
 585                         if (get_prefix(&prefix, *argv, AF_INET6))
 586                                 invarg("invalid 6rd_prefix\n", *argv);
 587                         cmd = SIOCADD6RD;
 588                         memcpy(&ip6rd.prefix, prefix.data, 16);
 589                         ip6rd.prefixlen = prefix.bitlen;
 590                 } else if (strcmp(*argv, "6rd-relay_prefix") == 0) {
 591                         NEXT_ARG();
 592                         if (get_prefix(&prefix, *argv, AF_INET))
 593                                 invarg("invalid 6rd-relay_prefix\n", *argv);
 594                         cmd = SIOCADD6RD;
 595                         memcpy(&ip6rd.relay_prefix, prefix.data, 4);
 596                         ip6rd.relay_prefixlen = prefix.bitlen;
 597                 } else if (strcmp(*argv, "6rd-reset") == 0) {
 598                         cmd = SIOCDEL6RD;
 599                 } else if (strcmp(*argv, "dev") == 0) {
 600                         NEXT_ARG();
 601                         strncpy(medium, *argv, IFNAMSIZ-1);
 602                         devname++;
 603                 } else {
 604                         fprintf(stderr,"%s: Invalid 6RD parameter.\n", *argv);
 605                         exit(-1);
 606                 }
 607                 argc--; argv++;
 608         }
 609         if (devname == 0) {
 610                 fprintf(stderr, "Must specify dev.\n");
 611                 exit(-1);
 612         }
 613
 614         return tnl_6rd_ioctl(cmd, medium, &ip6rd);
 615 }
 616
 617 int do_iptunnel(int argc, char **argv)
 618 {
 619         switch (preferred_family) {
 620         case AF_UNSPEC:
 621                 preferred_family = AF_INET;
 622                 break;
 623         case AF_INET:
 624                 break;
 625         /*
 626          * This is silly enough but we have no easy way to make it
 627          * protocol-independent because of unarranged structure between
 628          * IPv4 and IPv6.
 629          */
 630         case AF_INET6:
 631                 return do_ip6tunnel(argc, argv);
 632         default:
 633                 fprintf(stderr, "Unsupported family:%d\n", preferred_family);
 634                 exit(-1);
 635         }
 636
 637         if (argc > 0) {
 638                 if (matches(*argv, "add") == 0)
 639                         return do_add(SIOCADDTUNNEL, argc-1, argv+1);
 640                 if (matches(*argv, "change") == 0)
 641                         return do_add(SIOCCHGTUNNEL, argc-1, argv+1);
 642                 if (matches(*argv, "delete") == 0)
 643                         return do_del(argc-1, argv+1);
 644                 if (matches(*argv, "show") == 0 ||
 645                     matches(*argv, "lst") == 0 ||
 646                     matches(*argv, "list") == 0)
 647                         return do_show(argc-1, argv+1);
 648                 if (matches(*argv, "prl") == 0)
 649                         return do_prl(argc-1, argv+1);
 650                 if (matches(*argv, "6rd") == 0)
 651                         return do_6rd(argc-1, argv+1);
 652                 if (matches(*argv, "help") == 0)
 653                         usage();
 654         } else
 655                 return do_show(0, NULL);
 656
 657         fprintf(stderr, "Command \"%s\" is unknown, try \"ip tunnel help\".\n", *argv);
 658         exit(-1);
 659 }