git.ipfire.org Git - thirdparty/iproute2.git/blob

   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                         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 for \"key\": \"%s\"; it should be an unsigned integer\n", *argv);
 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 for \"ikey\": \"%s\"; it should be an unsigned integer\n", *argv);
 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 for \"okey\": \"%s\"; it should be an unsigned integer\n", *argv);
 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
 171                                 p->iph.daddr = htonl(INADDR_ANY);
 172                 } else if (strcmp(*argv, "local") == 0) {
 173                         NEXT_ARG();
 174                         if (strcmp(*argv, "any"))
 175                                 p->iph.saddr = get_addr32(*argv);
 176                         else
 177                                 p->iph.saddr = htonl(INADDR_ANY);
 178                 } else if (strcmp(*argv, "dev") == 0) {
 179                         NEXT_ARG();
 180                         strncpy(medium, *argv, IFNAMSIZ-1);
 181                 } else if (strcmp(*argv, "ttl") == 0 ||
 182                            strcmp(*argv, "hoplimit") == 0) {
 183                         unsigned uval;
 184                         NEXT_ARG();
 185                         if (strcmp(*argv, "inherit") != 0) {
 186                                 if (get_unsigned(&uval, *argv, 0))
 187                                         invarg("invalid TTL\n", *argv);
 188                                 if (uval > 255)
 189                                         invarg("TTL must be <=255\n", *argv);
 190                                 p->iph.ttl = uval;
 191                         }
 192                 } else if (strcmp(*argv, "tos") == 0 ||
 193                            strcmp(*argv, "tclass") == 0 ||
 194                            matches(*argv, "dsfield") == 0) {
 195                         char *dsfield;
 196                         __u32 uval;
 197                         NEXT_ARG();
 198                         dsfield = *argv;
 199                         strsep(&dsfield, "/");
 200                         if (strcmp(*argv, "inherit") != 0) {
 201                                 dsfield = *argv;
 202                                 p->iph.tos = 0;
 203                         } else
 204                                 p->iph.tos = 1;
 205                         if (dsfield) {
 206                                 if (rtnl_dsfield_a2n(&uval, dsfield))
 207                                         invarg("bad TOS value", *argv);
 208                                 p->iph.tos |= uval;
 209                         }
 210                 } else {
 211                         if (strcmp(*argv, "name") == 0) {
 212                                 NEXT_ARG();
 213                         } else if (matches(*argv, "help") == 0)
 214                                 usage();
 215                         if (p->name[0])
 216                                 duparg2("name", *argv);
 217                         strncpy(p->name, *argv, IFNAMSIZ);
 218                         if (cmd == SIOCCHGTUNNEL && count == 0) {
 219                                 struct ip_tunnel_parm old_p;
 220                                 memset(&old_p, 0, sizeof(old_p));
 221                                 if (tnl_get_ioctl(*argv, &old_p))
 222                                         return -1;
 223                                 *p = old_p;
 224                         }
 225                 }
 226                 count++;
 227                 argc--; argv++;
 228         }
 229
 230
 231         if (p->iph.protocol == 0) {
 232                 if (memcmp(p->name, "gre", 3) == 0)
 233                         p->iph.protocol = IPPROTO_GRE;
 234                 else if (memcmp(p->name, "ipip", 4) == 0)
 235                         p->iph.protocol = IPPROTO_IPIP;
 236                 else if (memcmp(p->name, "sit", 3) == 0)
 237                         p->iph.protocol = IPPROTO_IPV6;
 238                 else if (memcmp(p->name, "isatap", 6) == 0) {
 239                         p->iph.protocol = IPPROTO_IPV6;
 240                         isatap++;
 241                 } else if (memcmp(p->name, "vti", 3) == 0) {
 242                         p->iph.protocol = IPPROTO_IPIP;
 243                         p->i_flags |= VTI_ISVTI;
 244                 }
 245         }
 246
 247         if ((p->i_flags & GRE_KEY) || (p->o_flags & GRE_KEY)) {
 248                 if (!(p->i_flags & VTI_ISVTI) &&
 249                     (p->iph.protocol != IPPROTO_GRE)) {
 250                         fprintf(stderr, "Keys are not allowed with ipip and sit tunnels\n");
 251                         return -1;
 252                 }
 253         }
 254
 255         if (medium[0]) {
 256                 p->link = if_nametoindex(medium);
 257                 if (p->link == 0) {
 258                         fprintf(stderr, "Cannot find device \"%s\"\n",
 259                                 medium);
 260                         return -1;
 261                 }
 262         }
 263
 264         if (p->i_key == 0 && IN_MULTICAST(ntohl(p->iph.daddr))) {
 265                 p->i_key = p->iph.daddr;
 266                 p->i_flags |= GRE_KEY;
 267         }
 268         if (p->o_key == 0 && IN_MULTICAST(ntohl(p->iph.daddr))) {
 269                 p->o_key = p->iph.daddr;
 270                 p->o_flags |= GRE_KEY;
 271         }
 272         if (IN_MULTICAST(ntohl(p->iph.daddr)) && !p->iph.saddr) {
 273                 fprintf(stderr, "A broadcast tunnel requires a source address\n");
 274                 return -1;
 275         }
 276         if (isatap)
 277                 p->i_flags |= SIT_ISATAP;
 278
 279         return 0;
 280 }
 281
 282
 283 static int do_add(int cmd, int argc, char **argv)
 284 {
 285         struct ip_tunnel_parm p;
 286
 287         if (parse_args(argc, argv, cmd, &p) < 0)
 288                 return -1;
 289
 290         if (p.iph.ttl && p.iph.frag_off == 0) {
 291                 fprintf(stderr, "ttl != 0 and nopmtudisc are incompatible\n");
 292                 return -1;
 293         }
 294
 295         switch (p.iph.protocol) {
 296         case IPPROTO_IPIP:
 297                 if (p.i_flags & VTI_ISVTI)
 298                         return tnl_add_ioctl(cmd, "ip_vti0", p.name, &p);
 299                 else
 300                         return tnl_add_ioctl(cmd, "tunl0", p.name, &p);
 301         case IPPROTO_GRE:
 302                 return tnl_add_ioctl(cmd, "gre0", p.name, &p);
 303         case IPPROTO_IPV6:
 304                 return tnl_add_ioctl(cmd, "sit0", p.name, &p);
 305         default:
 306                 fprintf(stderr, "cannot determine tunnel mode (ipip, gre, vti or sit)\n");
 307                 return -1;
 308         }
 309         return -1;
 310 }
 311
 312 static int do_del(int argc, char **argv)
 313 {
 314         struct ip_tunnel_parm p;
 315
 316         if (parse_args(argc, argv, SIOCDELTUNNEL, &p) < 0)
 317                 return -1;
 318
 319         switch (p.iph.protocol) {
 320         case IPPROTO_IPIP:
 321                 if (p.i_flags & VTI_ISVTI)
 322                         return tnl_del_ioctl("ip_vti0", p.name, &p);
 323                 else
 324                         return tnl_del_ioctl("tunl0", p.name, &p);
 325         case IPPROTO_GRE:
 326                 return tnl_del_ioctl("gre0", p.name, &p);
 327         case IPPROTO_IPV6:
 328                 return tnl_del_ioctl("sit0", p.name, &p);
 329         default:
 330                 return tnl_del_ioctl(p.name, p.name, &p);
 331         }
 332         return -1;
 333 }
 334
 335 static void print_tunnel(struct ip_tunnel_parm *p)
 336 {
 337         struct ip_tunnel_6rd ip6rd;
 338         char s1[1024];
 339         char s2[1024];
 340
 341         memset(&ip6rd, 0, sizeof(ip6rd));
 342
 343         /* Do not use format_host() for local addr,
 344          * symbolic name will not be useful.
 345          */
 346         printf("%s: %s/ip  remote %s  local %s ",
 347                p->name,
 348                tnl_strproto(p->iph.protocol),
 349                p->iph.daddr ? format_host(AF_INET, 4, &p->iph.daddr, s1, sizeof(s1)) : "any",
 350                p->iph.saddr ? rt_addr_n2a(AF_INET, 4, &p->iph.saddr, s2, sizeof(s2)) : "any");
 351
 352         if (p->iph.protocol == IPPROTO_IPV6 && (p->i_flags & SIT_ISATAP)) {
 353                 struct ip_tunnel_prl prl[16];
 354                 int i;
 355
 356                 memset(prl, 0, sizeof(prl));
 357                 prl[0].datalen = sizeof(prl) - sizeof(prl[0]);
 358                 prl[0].addr = htonl(INADDR_ANY);
 359
 360                 if (!tnl_prl_ioctl(SIOCGETPRL, p->name, prl))
 361                         for (i = 1; i < sizeof(prl) / sizeof(prl[0]); i++)
 362                 {
 363                         if (prl[i].addr != htonl(INADDR_ANY)) {
 364                                 printf(" %s %s ",
 365                                         (prl[i].flags & PRL_DEFAULT) ? "pdr" : "pr",
 366                                         format_host(AF_INET, 4, &prl[i].addr, s1, sizeof(s1)));
 367                         }
 368                 }
 369         }
 370
 371         if (p->link) {
 372                 const char *n = ll_index_to_name(p->link);
 373                 if (n)
 374                         printf(" dev %s ", n);
 375         }
 376
 377         if (p->iph.ttl)
 378                 printf(" ttl %d ", p->iph.ttl);
 379         else
 380                 printf(" ttl inherit ");
 381
 382         if (p->iph.tos) {
 383                 SPRINT_BUF(b1);
 384                 printf(" tos");
 385                 if (p->iph.tos&1)
 386                         printf(" inherit");
 387                 if (p->iph.tos&~1)
 388                         printf("%c%s ", p->iph.tos&1 ? '/' : ' ',
 389                                rtnl_dsfield_n2a(p->iph.tos&~1, b1, sizeof(b1)));
 390         }
 391
 392         if (!(p->iph.frag_off&htons(IP_DF)))
 393                 printf(" nopmtudisc");
 394
 395         if (p->iph.protocol == IPPROTO_IPV6 && !tnl_ioctl_get_6rd(p->name, &ip6rd) && ip6rd.prefixlen) {
 396                 printf(" 6rd-prefix %s/%u ",
 397                        inet_ntop(AF_INET6, &ip6rd.prefix, s1, sizeof(s1)),
 398                        ip6rd.prefixlen);
 399                 if (ip6rd.relay_prefix) {
 400                         printf("6rd-relay_prefix %s/%u ",
 401                                format_host(AF_INET, 4, &ip6rd.relay_prefix, s1, sizeof(s1)),
 402                                ip6rd.relay_prefixlen);
 403                 }
 404         }
 405
 406         if ((p->i_flags&GRE_KEY) && (p->o_flags&GRE_KEY) && p->o_key == p->i_key)
 407                 printf(" key %u", ntohl(p->i_key));
 408         else if ((p->i_flags|p->o_flags)&GRE_KEY) {
 409                 if (p->i_flags&GRE_KEY)
 410                         printf(" ikey %u ", ntohl(p->i_key));
 411                 if (p->o_flags&GRE_KEY)
 412                         printf(" okey %u ", ntohl(p->o_key));
 413         }
 414
 415         if (p->i_flags&GRE_SEQ)
 416                 printf("%s  Drop packets out of sequence.", _SL_);
 417         if (p->i_flags&GRE_CSUM)
 418                 printf("%s  Checksum in received packet is required.", _SL_);
 419         if (p->o_flags&GRE_SEQ)
 420                 printf("%s  Sequence packets on output.", _SL_);
 421         if (p->o_flags&GRE_CSUM)
 422                 printf("%s  Checksum output packets.", _SL_);
 423 }
 424
 425 static int do_tunnels_list(struct ip_tunnel_parm *p)
 426 {
 427         char name[IFNAMSIZ];
 428         unsigned long  rx_bytes, rx_packets, rx_errs, rx_drops,
 429         rx_fifo, rx_frame,
 430         tx_bytes, tx_packets, tx_errs, tx_drops,
 431         tx_fifo, tx_colls, tx_carrier, rx_multi;
 432         struct ip_tunnel_parm p1;
 433
 434         char buf[512];
 435         FILE *fp = fopen("/proc/net/dev", "r");
 436         if (fp == NULL) {
 437                 perror("fopen");
 438                 return -1;
 439         }
 440
 441         /* skip header lines */
 442         if (!fgets(buf, sizeof(buf), fp) ||
 443             !fgets(buf, sizeof(buf), fp)) {
 444                 fprintf(stderr, "/proc/net/dev read error\n");
 445                 fclose(fp);
 446                 return -1;
 447         }
 448
 449         while (fgets(buf, sizeof(buf), fp) != NULL) {
 450                 int index, type;
 451                 char *ptr;
 452                 buf[sizeof(buf) - 1] = 0;
 453                 if ((ptr = strchr(buf, ':')) == NULL ||
 454                     (*ptr++ = 0, sscanf(buf, "%s", name) != 1)) {
 455                         fprintf(stderr, "Wrong format for /proc/net/dev. Giving up.\n");
 456                         fclose(fp);
 457                         return -1;
 458                 }
 459                 if (sscanf(ptr, "%ld%ld%ld%ld%ld%ld%ld%*d%ld%ld%ld%ld%ld%ld%ld",
 460                            &rx_bytes, &rx_packets, &rx_errs, &rx_drops,
 461                            &rx_fifo, &rx_frame, &rx_multi,
 462                            &tx_bytes, &tx_packets, &tx_errs, &tx_drops,
 463                            &tx_fifo, &tx_colls, &tx_carrier) != 14)
 464                         continue;
 465                 if (p->name[0] && strcmp(p->name, name))
 466                         continue;
 467                 index = ll_name_to_index(name);
 468                 if (index == 0)
 469                         continue;
 470                 type = ll_index_to_type(index);
 471                 if (type == -1) {
 472                         fprintf(stderr, "Failed to get type of \"%s\"\n", name);
 473                         continue;
 474                 }
 475                 if (type != ARPHRD_TUNNEL && type != ARPHRD_IPGRE && type != ARPHRD_SIT)
 476                         continue;
 477                 memset(&p1, 0, sizeof(p1));
 478                 if (tnl_get_ioctl(name, &p1))
 479                         continue;
 480                 if ((p->link && p1.link != p->link) ||
 481                     (p->name[0] && strcmp(p1.name, p->name)) ||
 482                     (p->iph.daddr && p1.iph.daddr != p->iph.daddr) ||
 483                     (p->iph.saddr && p1.iph.saddr != p->iph.saddr) ||
 484                     (p->i_key && p1.i_key != p->i_key))
 485                         continue;
 486                 print_tunnel(&p1);
 487                 if (show_stats) {
 488                         printf("%s", _SL_);
 489                         printf("RX: Packets    Bytes        Errors CsumErrs OutOfSeq Mcasts%s", _SL_);
 490                         printf("    %-10ld %-12ld %-6ld %-8ld %-8ld %-8ld%s",
 491                                rx_packets, rx_bytes, rx_errs, rx_frame, rx_fifo, rx_multi, _SL_);
 492                         printf("TX: Packets    Bytes        Errors DeadLoop NoRoute  NoBufs%s", _SL_);
 493                         printf("    %-10ld %-12ld %-6ld %-8ld %-8ld %-6ld",
 494                                tx_packets, tx_bytes, tx_errs, tx_colls, tx_carrier, tx_drops);
 495                 }
 496                 printf("\n");
 497         }
 498         fclose(fp);
 499         return 0;
 500 }
 501
 502 static int do_show(int argc, char **argv)
 503 {
 504         int err;
 505         struct ip_tunnel_parm p;
 506
 507         ll_init_map(&rth);
 508         if (parse_args(argc, argv, SIOCGETTUNNEL, &p) < 0)
 509                 return -1;
 510
 511         switch (p.iph.protocol) {
 512         case IPPROTO_IPIP:
 513                 if (p.i_flags & VTI_ISVTI)
 514                         err = tnl_get_ioctl(p.name[0] ? p.name : "ip_vti0", &p);
 515                 else
 516                         err = tnl_get_ioctl(p.name[0] ? p.name : "tunl0", &p);
 517                 break;
 518         case IPPROTO_GRE:
 519                 err = tnl_get_ioctl(p.name[0] ? p.name : "gre0", &p);
 520                 break;
 521         case IPPROTO_IPV6:
 522                 err = tnl_get_ioctl(p.name[0] ? p.name : "sit0", &p);
 523                 break;
 524         default:
 525                 do_tunnels_list(&p);
 526                 return 0;
 527         }
 528         if (err)
 529                 return -1;
 530
 531         print_tunnel(&p);
 532         printf("\n");
 533         return 0;
 534 }
 535
 536 static int do_prl(int argc, char **argv)
 537 {
 538         struct ip_tunnel_prl p;
 539         int count = 0;
 540         int devname = 0;
 541         int cmd = 0;
 542         char medium[IFNAMSIZ];
 543
 544         memset(&p, 0, sizeof(p));
 545         memset(&medium, 0, sizeof(medium));
 546
 547         while (argc > 0) {
 548                 if (strcmp(*argv, "prl-default") == 0) {
 549                         NEXT_ARG();
 550                         cmd = SIOCADDPRL;
 551                         p.addr = get_addr32(*argv);
 552                         p.flags |= PRL_DEFAULT;
 553                         count++;
 554                 } else if (strcmp(*argv, "prl-nodefault") == 0) {
 555                         NEXT_ARG();
 556                         cmd = SIOCADDPRL;
 557                         p.addr = get_addr32(*argv);
 558                         count++;
 559                 } else if (strcmp(*argv, "prl-delete") == 0) {
 560                         NEXT_ARG();
 561                         cmd = SIOCDELPRL;
 562                         p.addr = get_addr32(*argv);
 563                         count++;
 564                 } else if (strcmp(*argv, "dev") == 0) {
 565                         NEXT_ARG();
 566                         strncpy(medium, *argv, IFNAMSIZ-1);
 567                         devname++;
 568                 } else {
 569                         fprintf(stderr,"Invalid PRL parameter \"%s\"\n", *argv);
 570                         exit(-1);
 571                 }
 572                 if (count > 1) {
 573                         fprintf(stderr,"One PRL entry at a time\n");
 574                         exit(-1);
 575                 }
 576                 argc--; argv++;
 577         }
 578         if (devname == 0) {
 579                 fprintf(stderr, "Must specify device\n");
 580                 exit(-1);
 581         }
 582
 583         return tnl_prl_ioctl(cmd, medium, &p);
 584 }
 585
 586 static int do_6rd(int argc, char **argv)
 587 {
 588         struct ip_tunnel_6rd ip6rd;
 589         int devname = 0;
 590         int cmd = 0;
 591         char medium[IFNAMSIZ];
 592         inet_prefix prefix;
 593
 594         memset(&ip6rd, 0, sizeof(ip6rd));
 595         memset(&medium, 0, sizeof(medium));
 596
 597         while (argc > 0) {
 598                 if (strcmp(*argv, "6rd-prefix") == 0) {
 599                         NEXT_ARG();
 600                         if (get_prefix(&prefix, *argv, AF_INET6))
 601                                 invarg("invalid 6rd_prefix\n", *argv);
 602                         cmd = SIOCADD6RD;
 603                         memcpy(&ip6rd.prefix, prefix.data, 16);
 604                         ip6rd.prefixlen = prefix.bitlen;
 605                 } else if (strcmp(*argv, "6rd-relay_prefix") == 0) {
 606                         NEXT_ARG();
 607                         if (get_prefix(&prefix, *argv, AF_INET))
 608                                 invarg("invalid 6rd-relay_prefix\n", *argv);
 609                         cmd = SIOCADD6RD;
 610                         memcpy(&ip6rd.relay_prefix, prefix.data, 4);
 611                         ip6rd.relay_prefixlen = prefix.bitlen;
 612                 } else if (strcmp(*argv, "6rd-reset") == 0) {
 613                         cmd = SIOCDEL6RD;
 614                 } else if (strcmp(*argv, "dev") == 0) {
 615                         NEXT_ARG();
 616                         strncpy(medium, *argv, IFNAMSIZ-1);
 617                         devname++;
 618                 } else {
 619                         fprintf(stderr,"Invalid 6RD parameter \"%s\"\n", *argv);
 620                         exit(-1);
 621                 }
 622                 argc--; argv++;
 623         }
 624         if (devname == 0) {
 625                 fprintf(stderr, "Must specify device\n");
 626                 exit(-1);
 627         }
 628
 629         return tnl_6rd_ioctl(cmd, medium, &ip6rd);
 630 }
 631
 632 int do_iptunnel(int argc, char **argv)
 633 {
 634         switch (preferred_family) {
 635         case AF_UNSPEC:
 636                 preferred_family = AF_INET;
 637                 break;
 638         case AF_INET:
 639                 break;
 640         /*
 641          * This is silly enough but we have no easy way to make it
 642          * protocol-independent because of unarranged structure between
 643          * IPv4 and IPv6.
 644          */
 645         case AF_INET6:
 646                 return do_ip6tunnel(argc, argv);
 647         default:
 648                 fprintf(stderr, "Unsupported protocol family: %d\n", preferred_family);
 649                 exit(-1);
 650         }
 651
 652         if (argc > 0) {
 653                 if (matches(*argv, "add") == 0)
 654                         return do_add(SIOCADDTUNNEL, argc-1, argv+1);
 655                 if (matches(*argv, "change") == 0)
 656                         return do_add(SIOCCHGTUNNEL, argc-1, argv+1);
 657                 if (matches(*argv, "delete") == 0)
 658                         return do_del(argc-1, argv+1);
 659                 if (matches(*argv, "show") == 0 ||
 660                     matches(*argv, "lst") == 0 ||
 661                     matches(*argv, "list") == 0)
 662                         return do_show(argc-1, argv+1);
 663                 if (matches(*argv, "prl") == 0)
 664                         return do_prl(argc-1, argv+1);
 665                 if (matches(*argv, "6rd") == 0)
 666                         return do_6rd(argc-1, argv+1);
 667                 if (matches(*argv, "help") == 0)
 668                         usage();
 669         } else
 670                 return do_show(0, NULL);
 671
 672         fprintf(stderr, "Command \"%s\" is unknown, try \"ip tunnel help\"\n", *argv);
 673         exit(-1);
 674 }