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  * based on:
  20  * $Id: s.ipv6tunnel.c 1.7 02/12/11 11:21:51+02:00 antti@traci.mipl.mediapoli.com $
  21  *
  22  */
  23 /*
  24  * Author:
  25  *      Masahide NAKAMURA @USAGI
  26  */
  27
  28 #include <stdio.h>
  29 #include <string.h>
  30 #include <stdlib.h>
  31 #include <unistd.h>
  32 #include <sys/types.h>
  33 #include <sys/socket.h>
  34 #include <arpa/inet.h>
  35 #include <sys/ioctl.h>
  36 #include <linux/ip.h>
  37 #include <linux/if.h>
  38 #include <linux/if_arp.h>
  39 #include <linux/if_tunnel.h>
  40 #include <linux/ip6_tunnel.h>
  41
  42 #include "utils.h"
  43 #include "tunnel.h"
  44
  45 #define IP6_FLOWINFO_TCLASS     htonl(0x0FF00000)
  46 #define IP6_FLOWINFO_FLOWLABEL  htonl(0x000FFFFF)
  47
  48 #define DEFAULT_TNL_HOP_LIMIT   (64)
  49
  50 static void usage(void) __attribute__((noreturn));
  51
  52 static void usage(void)
  53 {
  54         fprintf(stderr, "Usage: ip -f inet6 tunnel { add | change | del | show } [ NAME ]\n");
  55         fprintf(stderr, "          [ mode { ip6ip6 | ipip6 | any } ]\n");
  56         fprintf(stderr, "          [ remote ADDR local ADDR ] [ dev PHYS_DEV ]\n");
  57         fprintf(stderr, "          [ encaplimit ELIM ]\n");
  58         fprintf(stderr ,"          [ hoplimit TTL ] [ tclass TCLASS ] [ flowlabel FLOWLABEL ]\n");
  59         fprintf(stderr, "          [ dscp inherit ]\n");
  60         fprintf(stderr, "\n");
  61         fprintf(stderr, "Where: NAME      := STRING\n");
  62         fprintf(stderr, "       ADDR      := IPV6_ADDRESS\n");
  63         fprintf(stderr, "       ELIM      := { none | 0..255 }(default=%d)\n",
  64                 IPV6_DEFAULT_TNL_ENCAP_LIMIT);
  65         fprintf(stderr, "       TTL       := 0..255 (default=%d)\n",
  66                 DEFAULT_TNL_HOP_LIMIT);
  67         fprintf(stderr, "       TOS       := { 0x0..0xff | inherit }\n");
  68         fprintf(stderr, "       FLOWLABEL := { 0x0..0xfffff | inherit }\n");
  69         exit(-1);
  70 }
  71
  72 static void print_tunnel(struct ip6_tnl_parm *p)
  73 {
  74         char remote[64];
  75         char local[64];
  76
  77         inet_ntop(AF_INET6, &p->raddr, remote, sizeof(remote));
  78         inet_ntop(AF_INET6, &p->laddr, local, sizeof(local));
  79
  80         printf("%s: %s/ipv6 remote %s local %s",
  81                p->name, tnl_strproto(p->proto), remote, local);
  82         if (p->link) {
  83                 char *n = tnl_ioctl_get_ifname(p->link);
  84                 if (n)
  85                         printf(" dev %s", n);
  86         }
  87
  88         if (p->flags & IP6_TNL_F_IGN_ENCAP_LIMIT)
  89                 printf(" encaplimit none");
  90         else
  91                 printf(" encaplimit %u", p->encap_limit);
  92
  93         printf(" hoplimit %u", p->hop_limit);
  94
  95         if (p->flags & IP6_TNL_F_USE_ORIG_TCLASS)
  96                 printf(" tclass inherit");
  97         else {
  98                 __u32 val = ntohl(p->flowinfo & IP6_FLOWINFO_TCLASS);
  99                 printf(" tclass 0x%02x", (__u8)(val >> 20));
 100         }
 101
 102         if (p->flags & IP6_TNL_F_USE_ORIG_FLOWLABEL)
 103                 printf(" flowlabel inherit");
 104         else
 105                 printf(" flowlabel 0x%05x", ntohl(p->flowinfo & IP6_FLOWINFO_FLOWLABEL));
 106
 107         printf(" (flowinfo 0x%08x)", ntohl(p->flowinfo));
 108
 109         if (p->flags & IP6_TNL_F_RCV_DSCP_COPY)
 110                 printf(" dscp inherit");
 111 }
 112
 113 static int parse_args(int argc, char **argv, struct ip6_tnl_parm *p)
 114 {
 115         char medium[IFNAMSIZ];
 116
 117         memset(medium, 0, sizeof(medium));
 118
 119         while (argc > 0) {
 120                 if (strcmp(*argv, "mode") == 0) {
 121                         NEXT_ARG();
 122                         if (strcmp(*argv, "ipv6/ipv6") == 0 ||
 123                             strcmp(*argv, "ip6ip6") == 0)
 124                                 p->proto = IPPROTO_IPV6;
 125                         else if (strcmp(*argv, "ip/ipv6") == 0 ||
 126                                  strcmp(*argv, "ipv4/ipv6") == 0 ||
 127                                  strcmp(*argv, "ipip6") == 0 ||
 128                                  strcmp(*argv, "ip4ip6") == 0)
 129                                 p->proto = IPPROTO_IPIP;
 130                         else if (strcmp(*argv, "any/ipv6") == 0 ||
 131                                  strcmp(*argv, "any") == 0)
 132                                 p->proto = 0;
 133                         else {
 134                                 fprintf(stderr,"Cannot guess tunnel mode.\n");
 135                                 exit(-1);
 136                         }
 137                 } else if (strcmp(*argv, "remote") == 0) {
 138                         inet_prefix raddr;
 139                         NEXT_ARG();
 140                         get_prefix(&raddr, *argv, preferred_family);
 141                         if (raddr.family == AF_UNSPEC)
 142                                 invarg("\"remote\" address family is AF_UNSPEC", *argv);
 143                         memcpy(&p->raddr, &raddr.data, sizeof(p->raddr));
 144                 } else if (strcmp(*argv, "local") == 0) {
 145                         inet_prefix laddr;
 146                         NEXT_ARG();
 147                         get_prefix(&laddr, *argv, preferred_family);
 148                         if (laddr.family == AF_UNSPEC)
 149                                 invarg("\"local\" address family is AF_UNSPEC", *argv);
 150                         memcpy(&p->laddr, &laddr.data, sizeof(p->laddr));
 151                 } else if (strcmp(*argv, "dev") == 0) {
 152                         NEXT_ARG();
 153                         strncpy(medium, *argv, IFNAMSIZ - 1);
 154                 } else if (strcmp(*argv, "encaplimit") == 0) {
 155                         NEXT_ARG();
 156                         if (strcmp(*argv, "none") == 0) {
 157                                 p->flags |= IP6_TNL_F_IGN_ENCAP_LIMIT;
 158                         } else {
 159                                 __u8 uval;
 160                                 if (get_u8(&uval, *argv, 0) < -1)
 161                                         invarg("invalid ELIM", *argv);
 162                                 p->encap_limit = uval;
 163                         }
 164                 } else if (strcmp(*argv, "hoplimit") == 0 ||
 165                            strcmp(*argv, "ttl") == 0 ||
 166                            strcmp(*argv, "hlim") == 0) {
 167                         __u8 uval;
 168                         NEXT_ARG();
 169                         if (get_u8(&uval, *argv, 0))
 170                                 invarg("invalid TTL", *argv);
 171                         p->hop_limit = uval;
 172                 } else if (strcmp(*argv, "tclass") == 0 ||
 173                            strcmp(*argv, "tc") == 0 ||
 174                            strcmp(*argv, "tos") == 0 ||
 175                            matches(*argv, "dsfield") == 0) {
 176                         __u8 uval;
 177                         NEXT_ARG();
 178                         if (strcmp(*argv, "inherit") == 0)
 179                                 p->flags |= IP6_TNL_F_USE_ORIG_TCLASS;
 180                         else {
 181                                 if (get_u8(&uval, *argv, 16))
 182                                         invarg("invalid TClass", *argv);
 183                                 p->flowinfo |= htonl((__u32)uval << 20) & IP6_FLOWINFO_TCLASS;
 184                                 p->flags &= ~IP6_TNL_F_USE_ORIG_TCLASS;
 185                         }
 186                 } else if (strcmp(*argv, "flowlabel") == 0 ||
 187                            strcmp(*argv, "fl") == 0) {
 188                         __u32 uval;
 189                         NEXT_ARG();
 190                         if (strcmp(*argv, "inherit") == 0)
 191                                 p->flags |= IP6_TNL_F_USE_ORIG_FLOWLABEL;
 192                         else {
 193                                 if (get_u32(&uval, *argv, 16))
 194                                         invarg("invalid Flowlabel", *argv);
 195                                 if (uval > 0xFFFFF)
 196                                         invarg("invalid Flowlabel", *argv);
 197                                 p->flowinfo |= htonl(uval) & IP6_FLOWINFO_FLOWLABEL;
 198                                 p->flags &= ~IP6_TNL_F_USE_ORIG_FLOWLABEL;
 199                         }
 200                 } else if (strcmp(*argv, "dscp") == 0) {
 201                         NEXT_ARG();
 202                         if (strcmp(*argv, "inherit") != 0)
 203                                 invarg("not inherit", *argv);
 204                         p->flags |= IP6_TNL_F_RCV_DSCP_COPY;
 205                 } else {
 206                         if (strcmp(*argv, "name") == 0) {
 207                                 NEXT_ARG();
 208                         }
 209                         if (matches(*argv, "help") == 0)
 210                                 usage();
 211                         if (p->name[0])
 212                                 duparg2("name", *argv);
 213                         strncpy(p->name, *argv, IFNAMSIZ - 1);
 214                 }
 215                 argc--; argv++;
 216         }
 217         if (medium[0]) {
 218                 p->link = tnl_ioctl_get_ifindex(medium);
 219                 if (p->link == 0)
 220                         return -1;
 221         }
 222         return 0;
 223 }
 224
 225 static void ip6_tnl_parm_init(struct ip6_tnl_parm *p, int apply_default)
 226 {
 227         memset(p, 0, sizeof(*p));
 228         p->proto = IPPROTO_IPV6;
 229         if (apply_default) {
 230                 p->hop_limit = DEFAULT_TNL_HOP_LIMIT;
 231                 p->encap_limit = IPV6_DEFAULT_TNL_ENCAP_LIMIT;
 232         }
 233 }
 234
 235 /*
 236  * @p1: user specified parameter
 237  * @p2: database entry
 238  */
 239 static int ip6_tnl_parm_match(const struct ip6_tnl_parm *p1,
 240                               const struct ip6_tnl_parm *p2)
 241 {
 242         return ((!p1->link || p1->link == p2->link) &&
 243                 (!p1->name[0] || strcmp(p1->name, p2->name) == 0) &&
 244                 (memcmp(&p1->laddr, &in6addr_any, sizeof(p1->laddr)) == 0 ||
 245                  memcmp(&p1->laddr, &p2->laddr, sizeof(p1->laddr)) == 0) &&
 246                 (memcmp(&p1->raddr, &in6addr_any, sizeof(p1->raddr)) == 0 ||
 247                  memcmp(&p1->raddr, &p2->raddr, sizeof(p1->raddr)) == 0) &&
 248                 (!p1->proto || !p2->proto || p1->proto == p2->proto) &&
 249                 (!p1->encap_limit || p1->encap_limit == p2->encap_limit) &&
 250                 (!p1->hop_limit || p1->hop_limit == p2->hop_limit) &&
 251                 (!(p1->flowinfo & IP6_FLOWINFO_TCLASS) ||
 252                  !((p1->flowinfo ^ p2->flowinfo) & IP6_FLOWINFO_TCLASS)) &&
 253                 (!(p1->flowinfo & IP6_FLOWINFO_FLOWLABEL) ||
 254                  !((p1->flowinfo ^ p2->flowinfo) & IP6_FLOWINFO_FLOWLABEL)) &&
 255                 (!p1->flags || (p1->flags & p2->flags)));
 256 }
 257
 258 static int do_tunnels_list(struct ip6_tnl_parm *p)
 259 {
 260         char buf[512];
 261         int err = -1;
 262         FILE *fp = fopen("/proc/net/dev", "r");
 263         if (fp == NULL) {
 264                 perror("fopen");
 265                 goto end;
 266         }
 267
 268         /* skip two lines at the begenning of the file */
 269         fgets(buf, sizeof(buf), fp);
 270         fgets(buf, sizeof(buf), fp);
 271
 272         while (fgets(buf, sizeof(buf), fp) != NULL) {
 273                 char name[IFNAMSIZ];
 274                 int type;
 275                 unsigned long rx_bytes, rx_packets, rx_errs, rx_drops,
 276                         rx_fifo, rx_frame,
 277                         tx_bytes, tx_packets, tx_errs, tx_drops,
 278                         tx_fifo, tx_colls, tx_carrier, rx_multi;
 279                 struct ip6_tnl_parm p1;
 280                 char *ptr;
 281
 282                 buf[sizeof(buf) - 1] = '\0';
 283                 if ((ptr = strchr(buf, ':')) == NULL ||
 284                     (*ptr++ = 0, sscanf(buf, "%s", name) != 1)) {
 285                         fprintf(stderr, "Wrong format of /proc/net/dev. Sorry.\n");
 286                         goto end;
 287                 }
 288                 if (sscanf(ptr, "%ld%ld%ld%ld%ld%ld%ld%*d%ld%ld%ld%ld%ld%ld%ld",
 289                            &rx_bytes, &rx_packets, &rx_errs, &rx_drops,
 290                            &rx_fifo, &rx_frame, &rx_multi,
 291                            &tx_bytes, &tx_packets, &tx_errs, &tx_drops,
 292                            &tx_fifo, &tx_colls, &tx_carrier) != 14)
 293                         continue;
 294                 if (p->name[0] && strcmp(p->name, name))
 295                         continue;
 296                 type = tnl_ioctl_get_iftype(name);
 297                 if (type == -1) {
 298                         fprintf(stderr, "Failed to get type of [%s]\n", name);
 299                         continue;
 300                 }
 301                 if (type != ARPHRD_TUNNEL6)
 302                         continue;
 303                 memset(&p1, 0, sizeof(p1));
 304                 ip6_tnl_parm_init(&p1, 0);
 305                 strcpy(p1.name, name);
 306                 p1.link = tnl_ioctl_get_ifindex(p1.name);
 307                 if (p1.link == 0)
 308                         continue;
 309                 if (tnl_get_ioctl(p1.name, &p1))
 310                         continue;
 311                 if (!ip6_tnl_parm_match(p, &p1))
 312                         continue;
 313                 print_tunnel(&p1);
 314                 if (show_stats) {
 315                         printf("%s", _SL_);
 316                         printf("RX: Packets    Bytes        Errors CsumErrs OutOfSeq Mcasts%s", _SL_);
 317                         printf("    %-10ld %-12ld %-6ld %-8ld %-8ld %-8ld%s",
 318                                rx_packets, rx_bytes, rx_errs, rx_frame, rx_fifo, rx_multi, _SL_);
 319                         printf("TX: Packets    Bytes        Errors DeadLoop NoRoute  NoBufs%s", _SL_);
 320                         printf("    %-10ld %-12ld %-6ld %-8ld %-8ld %-6ld",
 321                                tx_packets, tx_bytes, tx_errs, tx_colls, tx_carrier, tx_drops);
 322                 }
 323                 printf("\n");
 324         }
 325         err = 0;
 326
 327  end:
 328         if (fp)
 329                 fclose(fp);
 330         return err;
 331 }
 332
 333 static int do_show(int argc, char **argv)
 334 {
 335         struct ip6_tnl_parm p;
 336
 337         ip6_tnl_parm_init(&p, 0);
 338
 339         if (parse_args(argc, argv, &p) < 0)
 340                 return -1;
 341
 342         if (!p.name[0] || show_stats)
 343                 do_tunnels_list(&p);
 344         else {
 345                 if (tnl_get_ioctl(p.name, &p))
 346                         return -1;
 347                 print_tunnel(&p);
 348                 printf("\n");
 349         }
 350
 351         return 0;
 352 }
 353
 354 static int do_add(int cmd, int argc, char **argv)
 355 {
 356         struct ip6_tnl_parm p;
 357
 358         ip6_tnl_parm_init(&p, 1);
 359
 360         if (parse_args(argc, argv, &p) < 0)
 361                 return -1;
 362
 363         return tnl_add_ioctl(cmd,
 364                              cmd == SIOCCHGTUNNEL && p.name[0] ?
 365                              p.name : "ip6tnl0", p.name, &p);
 366 }
 367
 368 static int do_del(int argc, char **argv)
 369 {
 370         struct ip6_tnl_parm p;
 371
 372         ip6_tnl_parm_init(&p, 1);
 373
 374         if (parse_args(argc, argv, &p) < 0)
 375                 return -1;
 376
 377         return tnl_del_ioctl(p.name[0] ? p.name : "ip6tnl0", p.name, &p);
 378 }
 379
 380 int do_ip6tunnel(int argc, char **argv)
 381 {
 382         switch (preferred_family) {
 383         case AF_UNSPEC:
 384                 preferred_family = AF_INET6;
 385                 break;
 386         case AF_INET6:
 387                 break;
 388         default:
 389                 fprintf(stderr, "Unsupported family:%d\n", preferred_family);
 390                 exit(-1);
 391         }
 392
 393         if (argc > 0) {
 394                 if (matches(*argv, "add") == 0)
 395                         return do_add(SIOCADDTUNNEL, argc - 1, argv + 1);
 396                 if (matches(*argv, "change") == 0)
 397                         return do_add(SIOCCHGTUNNEL, argc - 1, argv + 1);
 398                 if (matches(*argv, "del") == 0)
 399                         return do_del(argc - 1, argv + 1);
 400                 if (matches(*argv, "show") == 0 ||
 401                     matches(*argv, "lst") == 0 ||
 402                     matches(*argv, "list") == 0)
 403                         return do_show(argc - 1, argv + 1);
 404                 if (matches(*argv, "help") == 0)
 405                         usage();
 406         } else
 407                 return do_show(0, NULL);
 408
 409         fprintf(stderr, "Command \"%s\" is unknown, try \"ip -f inet6 tunnel help\".\n", *argv);
 410         exit(-1);
 411 }