ip/ip6tunnel.c

   1 /*
   2  * Copyright (C)2006 USAGI/WIDE Project
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation; either version 2 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software
  16  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  17  */
  18 /*
  19  * Author:
  20  *      Masahide NAKAMURA @USAGI
  21  */
  22
  23 #include <stdio.h>
  24 #include <string.h>
  25 #include <stdlib.h>
  26 #include <unistd.h>
  27 #include <sys/types.h>
  28 #include <sys/socket.h>
  29 #include <arpa/inet.h>
  30 #include <sys/ioctl.h>
  31 #include <linux/ip.h>
  32 #include <linux/if.h>
  33 #include <linux/if_arp.h>
  34 #include <linux/if_tunnel.h>
  35 #include <linux/ip6_tunnel.h>
  36
  37 #include "utils.h"
  38 #include "tunnel.h"
  39 #include "ip_common.h"
  40
  41 #define IP6_FLOWINFO_TCLASS     htonl(0x0FF00000)
  42 #define IP6_FLOWINFO_FLOWLABEL  htonl(0x000FFFFF)
  43
  44 #define DEFAULT_TNL_HOP_LIMIT   (64)
  45
  46 static void usage(void) __attribute__((noreturn));
  47
  48 static void usage(void)
  49 {
  50         fprintf(stderr, "Usage: ip -f inet6 tunnel { add | change | del | show } [ NAME ]\n");
  51         fprintf(stderr, "          [ mode { ip6ip6 | ipip6 | any } ]\n");
  52         fprintf(stderr, "          [ remote ADDR local ADDR ] [ dev PHYS_DEV ]\n");
  53         fprintf(stderr, "          [ encaplimit ELIM ]\n");
  54         fprintf(stderr ,"          [ hoplimit TTL ] [ tclass TCLASS ] [ flowlabel FLOWLABEL ]\n");
  55         fprintf(stderr, "          [ dscp inherit ]\n");
  56         fprintf(stderr, "\n");
  57         fprintf(stderr, "Where: NAME      := STRING\n");
  58         fprintf(stderr, "       ADDR      := IPV6_ADDRESS\n");
  59         fprintf(stderr, "       ELIM      := { none | 0..255 }(default=%d)\n",
  60                 IPV6_DEFAULT_TNL_ENCAP_LIMIT);
  61         fprintf(stderr, "       TTL       := 0..255 (default=%d)\n",
  62                 DEFAULT_TNL_HOP_LIMIT);
  63         fprintf(stderr, "       TOS       := { 0x0..0xff | inherit }\n");
  64         fprintf(stderr, "       FLOWLABEL := { 0x0..0xfffff | inherit }\n");
  65         exit(-1);
  66 }
  67
  68 static void print_tunnel(struct ip6_tnl_parm *p)
  69 {
  70         char remote[64];
  71         char local[64];
  72
  73         inet_ntop(AF_INET6, &p->raddr, remote, sizeof(remote));
  74         inet_ntop(AF_INET6, &p->laddr, local, sizeof(local));
  75
  76         printf("%s: %s/ipv6 remote %s local %s",
  77                p->name, tnl_strproto(p->proto), remote, local);
  78         if (p->link) {
  79                 const char *n = ll_index_to_name(p->link);
  80                 if (n)
  81                         printf(" dev %s", n);
  82         }
  83
  84         if (p->flags & IP6_TNL_F_IGN_ENCAP_LIMIT)
  85                 printf(" encaplimit none");
  86         else
  87                 printf(" encaplimit %u", p->encap_limit);
  88
  89         printf(" hoplimit %u", p->hop_limit);
  90
  91         if (p->flags & IP6_TNL_F_USE_ORIG_TCLASS)
  92                 printf(" tclass inherit");
  93         else {
  94                 __u32 val = ntohl(p->flowinfo & IP6_FLOWINFO_TCLASS);
  95                 printf(" tclass 0x%02x", (__u8)(val >> 20));
  96         }
  97
  98         if (p->flags & IP6_TNL_F_USE_ORIG_FLOWLABEL)
  99                 printf(" flowlabel inherit");
 100         else
 101                 printf(" flowlabel 0x%05x", ntohl(p->flowinfo & IP6_FLOWINFO_FLOWLABEL));
 102
 103         printf(" (flowinfo 0x%08x)", ntohl(p->flowinfo));
 104
 105         if (p->flags & IP6_TNL_F_RCV_DSCP_COPY)
 106                 printf(" dscp inherit");
 107 }
 108
 109 static int parse_args(int argc, char **argv, int cmd, struct ip6_tnl_parm *p)
 110 {
 111         int count = 0;
 112         char medium[IFNAMSIZ];
 113
 114         memset(medium, 0, sizeof(medium));
 115
 116         while (argc > 0) {
 117                 if (strcmp(*argv, "mode") == 0) {
 118                         NEXT_ARG();
 119                         if (strcmp(*argv, "ipv6/ipv6") == 0 ||
 120                             strcmp(*argv, "ip6ip6") == 0)
 121                                 p->proto = IPPROTO_IPV6;
 122                         else if (strcmp(*argv, "ip/ipv6") == 0 ||
 123                                  strcmp(*argv, "ipv4/ipv6") == 0 ||
 124                                  strcmp(*argv, "ipip6") == 0 ||
 125                                  strcmp(*argv, "ip4ip6") == 0)
 126                                 p->proto = IPPROTO_IPIP;
 127                         else if (strcmp(*argv, "any/ipv6") == 0 ||
 128                                  strcmp(*argv, "any") == 0)
 129                                 p->proto = 0;
 130                         else {
 131                                 fprintf(stderr,"Cannot guess tunnel mode.\n");
 132                                 exit(-1);
 133                         }
 134                 } else if (strcmp(*argv, "remote") == 0) {
 135                         inet_prefix raddr;
 136                         NEXT_ARG();
 137                         get_prefix(&raddr, *argv, preferred_family);
 138                         if (raddr.family == AF_UNSPEC)
 139                                 invarg("\"remote\" address family is AF_UNSPEC", *argv);
 140                         memcpy(&p->raddr, &raddr.data, sizeof(p->raddr));
 141                 } else if (strcmp(*argv, "local") == 0) {
 142                         inet_prefix laddr;
 143                         NEXT_ARG();
 144                         get_prefix(&laddr, *argv, preferred_family);
 145                         if (laddr.family == AF_UNSPEC)
 146                                 invarg("\"local\" address family is AF_UNSPEC", *argv);
 147                         memcpy(&p->laddr, &laddr.data, sizeof(p->laddr));
 148                 } else if (strcmp(*argv, "dev") == 0) {
 149                         NEXT_ARG();
 150                         strncpy(medium, *argv, IFNAMSIZ - 1);
 151                 } else if (strcmp(*argv, "encaplimit") == 0) {
 152                         NEXT_ARG();
 153                         if (strcmp(*argv, "none") == 0) {
 154                                 p->flags |= IP6_TNL_F_IGN_ENCAP_LIMIT;
 155                         } else {
 156                                 __u8 uval;
 157                                 if (get_u8(&uval, *argv, 0) < -1)
 158                                         invarg("invalid ELIM", *argv);
 159                                 p->encap_limit = uval;
 160                         }
 161                 } else if (strcmp(*argv, "hoplimit") == 0 ||
 162                            strcmp(*argv, "ttl") == 0 ||
 163                            strcmp(*argv, "hlim") == 0) {
 164                         __u8 uval;
 165                         NEXT_ARG();
 166                         if (get_u8(&uval, *argv, 0))
 167                                 invarg("invalid TTL", *argv);
 168                         p->hop_limit = uval;
 169                 } else if (strcmp(*argv, "tclass") == 0 ||
 170                            strcmp(*argv, "tc") == 0 ||
 171                            strcmp(*argv, "tos") == 0 ||
 172                            matches(*argv, "dsfield") == 0) {
 173                         __u8 uval;
 174                         NEXT_ARG();
 175                         if (strcmp(*argv, "inherit") == 0)
 176                                 p->flags |= IP6_TNL_F_USE_ORIG_TCLASS;
 177                         else {
 178                                 if (get_u8(&uval, *argv, 16))
 179                                         invarg("invalid TClass", *argv);
 180                                 p->flowinfo |= htonl((__u32)uval << 20) & IP6_FLOWINFO_TCLASS;
 181                                 p->flags &= ~IP6_TNL_F_USE_ORIG_TCLASS;
 182                         }
 183                 } else if (strcmp(*argv, "flowlabel") == 0 ||
 184                            strcmp(*argv, "fl") == 0) {
 185                         __u32 uval;
 186                         NEXT_ARG();
 187                         if (strcmp(*argv, "inherit") == 0)
 188                                 p->flags |= IP6_TNL_F_USE_ORIG_FLOWLABEL;
 189                         else {
 190                                 if (get_u32(&uval, *argv, 16))
 191                                         invarg("invalid Flowlabel", *argv);
 192                                 if (uval > 0xFFFFF)
 193                                         invarg("invalid Flowlabel", *argv);
 194                                 p->flowinfo |= htonl(uval) & IP6_FLOWINFO_FLOWLABEL;
 195                                 p->flags &= ~IP6_TNL_F_USE_ORIG_FLOWLABEL;
 196                         }
 197                 } else if (strcmp(*argv, "dscp") == 0) {
 198                         NEXT_ARG();
 199                         if (strcmp(*argv, "inherit") != 0)
 200                                 invarg("not inherit", *argv);
 201                         p->flags |= IP6_TNL_F_RCV_DSCP_COPY;
 202                 } else {
 203                         if (strcmp(*argv, "name") == 0) {
 204                                 NEXT_ARG();
 205                         }
 206                         if (matches(*argv, "help") == 0)
 207                                 usage();
 208                         if (p->name[0])
 209                                 duparg2("name", *argv);
 210                         strncpy(p->name, *argv, IFNAMSIZ - 1);
 211                         if (cmd == SIOCCHGTUNNEL && count == 0) {
 212                                 struct ip6_tnl_parm old_p;
 213                                 memset(&old_p, 0, sizeof(old_p));
 214                                 if (tnl_get_ioctl(*argv, &old_p))
 215                                         return -1;
 216                                 *p = old_p;
 217                         }
 218                 }
 219                 count++;
 220                 argc--; argv++;
 221         }
 222         if (medium[0]) {
 223                 p->link = ll_name_to_index(medium);
 224                 if (p->link == 0)
 225                         return -1;
 226         }
 227         return 0;
 228 }
 229
 230 static void ip6_tnl_parm_init(struct ip6_tnl_parm *p, int apply_default)
 231 {
 232         memset(p, 0, sizeof(*p));
 233         p->proto = IPPROTO_IPV6;
 234         if (apply_default) {
 235                 p->hop_limit = DEFAULT_TNL_HOP_LIMIT;
 236                 p->encap_limit = IPV6_DEFAULT_TNL_ENCAP_LIMIT;
 237         }
 238 }
 239
 240 /*
 241  * @p1: user specified parameter
 242  * @p2: database entry
 243  */
 244 static int ip6_tnl_parm_match(const struct ip6_tnl_parm *p1,
 245                               const struct ip6_tnl_parm *p2)
 246 {
 247         return ((!p1->link || p1->link == p2->link) &&
 248                 (!p1->name[0] || strcmp(p1->name, p2->name) == 0) &&
 249                 (memcmp(&p1->laddr, &in6addr_any, sizeof(p1->laddr)) == 0 ||
 250                  memcmp(&p1->laddr, &p2->laddr, sizeof(p1->laddr)) == 0) &&
 251                 (memcmp(&p1->raddr, &in6addr_any, sizeof(p1->raddr)) == 0 ||
 252                  memcmp(&p1->raddr, &p2->raddr, sizeof(p1->raddr)) == 0) &&
 253                 (!p1->proto || !p2->proto || p1->proto == p2->proto) &&
 254                 (!p1->encap_limit || p1->encap_limit == p2->encap_limit) &&
 255                 (!p1->hop_limit || p1->hop_limit == p2->hop_limit) &&
 256                 (!(p1->flowinfo & IP6_FLOWINFO_TCLASS) ||
 257                  !((p1->flowinfo ^ p2->flowinfo) & IP6_FLOWINFO_TCLASS)) &&
 258                 (!(p1->flowinfo & IP6_FLOWINFO_FLOWLABEL) ||
 259                  !((p1->flowinfo ^ p2->flowinfo) & IP6_FLOWINFO_FLOWLABEL)) &&
 260                 (!p1->flags || (p1->flags & p2->flags)));
 261 }
 262
 263 static int do_tunnels_list(struct ip6_tnl_parm *p)
 264 {
 265         char buf[512];
 266         int err = -1;
 267         FILE *fp = fopen("/proc/net/dev", "r");
 268         if (fp == NULL) {
 269                 perror("fopen");
 270                 goto end;
 271         }
 272
 273         /* skip two lines at the begenning of the file */
 274         if (!fgets(buf, sizeof(buf), fp) ||
 275             !fgets(buf, sizeof(buf), fp)) {
 276                 fprintf(stderr, "/proc/net/dev read error\n");
 277                 return -1;
 278         }
 279
 280         while (fgets(buf, sizeof(buf), fp) != NULL) {
 281                 char name[IFNAMSIZ];
 282                 int index, type;
 283                 unsigned long rx_bytes, rx_packets, rx_errs, rx_drops,
 284                         rx_fifo, rx_frame,
 285                         tx_bytes, tx_packets, tx_errs, tx_drops,
 286                         tx_fifo, tx_colls, tx_carrier, rx_multi;
 287                 struct ip6_tnl_parm p1;
 288                 char *ptr;
 289
 290                 buf[sizeof(buf) - 1] = '\0';
 291                 if ((ptr = strchr(buf, ':')) == NULL ||
 292                     (*ptr++ = 0, sscanf(buf, "%s", name) != 1)) {
 293                         fprintf(stderr, "Wrong format of /proc/net/dev. Sorry.\n");
 294                         goto end;
 295                 }
 296                 if (sscanf(ptr, "%ld%ld%ld%ld%ld%ld%ld%*d%ld%ld%ld%ld%ld%ld%ld",
 297                            &rx_bytes, &rx_packets, &rx_errs, &rx_drops,
 298                            &rx_fifo, &rx_frame, &rx_multi,
 299                            &tx_bytes, &tx_packets, &tx_errs, &tx_drops,
 300                            &tx_fifo, &tx_colls, &tx_carrier) != 14)
 301                         continue;
 302                 if (p->name[0] && strcmp(p->name, name))
 303                         continue;
 304                 index = ll_name_to_index(name);
 305                 if (index == 0)
 306                         continue;
 307                 type = ll_index_to_type(index);
 308                 if (type == -1) {
 309                         fprintf(stderr, "Failed to get type of [%s]\n", name);
 310                         continue;
 311                 }
 312                 if (type != ARPHRD_TUNNEL6)
 313                         continue;
 314                 memset(&p1, 0, sizeof(p1));
 315                 ip6_tnl_parm_init(&p1, 0);
 316                 strcpy(p1.name, name);
 317                 p1.link = ll_name_to_index(p1.name);
 318                 if (p1.link == 0)
 319                         continue;
 320                 if (tnl_get_ioctl(p1.name, &p1))
 321                         continue;
 322                 if (!ip6_tnl_parm_match(p, &p1))
 323                         continue;
 324                 print_tunnel(&p1);
 325                 if (show_stats) {
 326                         printf("%s", _SL_);
 327                         printf("RX: Packets    Bytes        Errors CsumErrs OutOfSeq Mcasts%s", _SL_);
 328                         printf("    %-10ld %-12ld %-6ld %-8ld %-8ld %-8ld%s",
 329                                rx_packets, rx_bytes, rx_errs, rx_frame, rx_fifo, rx_multi, _SL_);
 330                         printf("TX: Packets    Bytes        Errors DeadLoop NoRoute  NoBufs%s", _SL_);
 331                         printf("    %-10ld %-12ld %-6ld %-8ld %-8ld %-6ld",
 332                                tx_packets, tx_bytes, tx_errs, tx_colls, tx_carrier, tx_drops);
 333                 }
 334                 printf("\n");
 335         }
 336         err = 0;
 337
 338  end:
 339         if (fp)
 340                 fclose(fp);
 341         return err;
 342 }
 343
 344 static int do_show(int argc, char **argv)
 345 {
 346         struct ip6_tnl_parm p;
 347
 348         ll_init_map(&rth);
 349         ip6_tnl_parm_init(&p, 0);
 350         p.proto = 0;  /* default to any */
 351
 352         if (parse_args(argc, argv, SIOCGETTUNNEL, &p) < 0)
 353                 return -1;
 354
 355         if (!p.name[0] || show_stats)
 356                 do_tunnels_list(&p);
 357         else {
 358                 if (tnl_get_ioctl(p.name, &p))
 359                         return -1;
 360                 print_tunnel(&p);
 361                 printf("\n");
 362         }
 363
 364         return 0;
 365 }
 366
 367 static int do_add(int cmd, int argc, char **argv)
 368 {
 369         struct ip6_tnl_parm p;
 370
 371         ip6_tnl_parm_init(&p, 1);
 372
 373         if (parse_args(argc, argv, cmd, &p) < 0)
 374                 return -1;
 375
 376         return tnl_add_ioctl(cmd,
 377                              cmd == SIOCCHGTUNNEL && p.name[0] ?
 378                              p.name : "ip6tnl0", p.name, &p);
 379 }
 380
 381 static int do_del(int argc, char **argv)
 382 {
 383         struct ip6_tnl_parm p;
 384
 385         ip6_tnl_parm_init(&p, 1);
 386
 387         if (parse_args(argc, argv, SIOCDELTUNNEL, &p) < 0)
 388                 return -1;
 389
 390         return tnl_del_ioctl(p.name[0] ? p.name : "ip6tnl0", p.name, &p);
 391 }
 392
 393 int do_ip6tunnel(int argc, char **argv)
 394 {
 395         switch (preferred_family) {
 396         case AF_UNSPEC:
 397                 preferred_family = AF_INET6;
 398                 break;
 399         case AF_INET6:
 400                 break;
 401         default:
 402                 fprintf(stderr, "Unsupported family:%d\n", preferred_family);
 403                 exit(-1);
 404         }
 405
 406         if (argc > 0) {
 407                 if (matches(*argv, "add") == 0)
 408                         return do_add(SIOCADDTUNNEL, argc - 1, argv + 1);
 409                 if (matches(*argv, "change") == 0)
 410                         return do_add(SIOCCHGTUNNEL, argc - 1, argv + 1);
 411                 if (matches(*argv, "del") == 0)
 412                         return do_del(argc - 1, argv + 1);
 413                 if (matches(*argv, "show") == 0 ||
 414                     matches(*argv, "lst") == 0 ||
 415                     matches(*argv, "list") == 0)
 416                         return do_show(argc - 1, argv + 1);
 417                 if (matches(*argv, "help") == 0)
 418                         usage();
 419         } else
 420                 return do_show(0, NULL);
 421
 422         fprintf(stderr, "Command \"%s\" is unknown, try \"ip -f inet6 tunnel help\".\n", *argv);
 423         exit(-1);
 424 }