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, struct ip6_tnl_parm *p)
 110 {
 111         char medium[IFNAMSIZ];
 112
 113         memset(medium, 0, sizeof(medium));
 114
 115         while (argc > 0) {
 116                 if (strcmp(*argv, "mode") == 0) {
 117                         NEXT_ARG();
 118                         if (strcmp(*argv, "ipv6/ipv6") == 0 ||
 119                             strcmp(*argv, "ip6ip6") == 0)
 120                                 p->proto = IPPROTO_IPV6;
 121                         else if (strcmp(*argv, "ip/ipv6") == 0 ||
 122                                  strcmp(*argv, "ipv4/ipv6") == 0 ||
 123                                  strcmp(*argv, "ipip6") == 0 ||
 124                                  strcmp(*argv, "ip4ip6") == 0)
 125                                 p->proto = IPPROTO_IPIP;
 126                         else if (strcmp(*argv, "any/ipv6") == 0 ||
 127                                  strcmp(*argv, "any") == 0)
 128                                 p->proto = 0;
 129                         else {
 130                                 fprintf(stderr,"Cannot guess tunnel mode.\n");
 131                                 exit(-1);
 132                         }
 133                 } else if (strcmp(*argv, "remote") == 0) {
 134                         inet_prefix raddr;
 135                         NEXT_ARG();
 136                         get_prefix(&raddr, *argv, preferred_family);
 137                         if (raddr.family == AF_UNSPEC)
 138                                 invarg("\"remote\" address family is AF_UNSPEC", *argv);
 139                         memcpy(&p->raddr, &raddr.data, sizeof(p->raddr));
 140                 } else if (strcmp(*argv, "local") == 0) {
 141                         inet_prefix laddr;
 142                         NEXT_ARG();
 143                         get_prefix(&laddr, *argv, preferred_family);
 144                         if (laddr.family == AF_UNSPEC)
 145                                 invarg("\"local\" address family is AF_UNSPEC", *argv);
 146                         memcpy(&p->laddr, &laddr.data, sizeof(p->laddr));
 147                 } else if (strcmp(*argv, "dev") == 0) {
 148                         NEXT_ARG();
 149                         strncpy(medium, *argv, IFNAMSIZ - 1);
 150                 } else if (strcmp(*argv, "encaplimit") == 0) {
 151                         NEXT_ARG();
 152                         if (strcmp(*argv, "none") == 0) {
 153                                 p->flags |= IP6_TNL_F_IGN_ENCAP_LIMIT;
 154                         } else {
 155                                 __u8 uval;
 156                                 if (get_u8(&uval, *argv, 0) < -1)
 157                                         invarg("invalid ELIM", *argv);
 158                                 p->encap_limit = uval;
 159                         }
 160                 } else if (strcmp(*argv, "hoplimit") == 0 ||
 161                            strcmp(*argv, "ttl") == 0 ||
 162                            strcmp(*argv, "hlim") == 0) {
 163                         __u8 uval;
 164                         NEXT_ARG();
 165                         if (get_u8(&uval, *argv, 0))
 166                                 invarg("invalid TTL", *argv);
 167                         p->hop_limit = uval;
 168                 } else if (strcmp(*argv, "tclass") == 0 ||
 169                            strcmp(*argv, "tc") == 0 ||
 170                            strcmp(*argv, "tos") == 0 ||
 171                            matches(*argv, "dsfield") == 0) {
 172                         __u8 uval;
 173                         NEXT_ARG();
 174                         if (strcmp(*argv, "inherit") == 0)
 175                                 p->flags |= IP6_TNL_F_USE_ORIG_TCLASS;
 176                         else {
 177                                 if (get_u8(&uval, *argv, 16))
 178                                         invarg("invalid TClass", *argv);
 179                                 p->flowinfo |= htonl((__u32)uval << 20) & IP6_FLOWINFO_TCLASS;
 180                                 p->flags &= ~IP6_TNL_F_USE_ORIG_TCLASS;
 181                         }
 182                 } else if (strcmp(*argv, "flowlabel") == 0 ||
 183                            strcmp(*argv, "fl") == 0) {
 184                         __u32 uval;
 185                         NEXT_ARG();
 186                         if (strcmp(*argv, "inherit") == 0)
 187                                 p->flags |= IP6_TNL_F_USE_ORIG_FLOWLABEL;
 188                         else {
 189                                 if (get_u32(&uval, *argv, 16))
 190                                         invarg("invalid Flowlabel", *argv);
 191                                 if (uval > 0xFFFFF)
 192                                         invarg("invalid Flowlabel", *argv);
 193                                 p->flowinfo |= htonl(uval) & IP6_FLOWINFO_FLOWLABEL;
 194                                 p->flags &= ~IP6_TNL_F_USE_ORIG_FLOWLABEL;
 195                         }
 196                 } else if (strcmp(*argv, "dscp") == 0) {
 197                         NEXT_ARG();
 198                         if (strcmp(*argv, "inherit") != 0)
 199                                 invarg("not inherit", *argv);
 200                         p->flags |= IP6_TNL_F_RCV_DSCP_COPY;
 201                 } else {
 202                         if (strcmp(*argv, "name") == 0) {
 203                                 NEXT_ARG();
 204                         }
 205                         if (matches(*argv, "help") == 0)
 206                                 usage();
 207                         if (p->name[0])
 208                                 duparg2("name", *argv);
 209                         strncpy(p->name, *argv, IFNAMSIZ - 1);
 210                 }
 211                 argc--; argv++;
 212         }
 213         if (medium[0]) {
 214                 p->link = ll_name_to_index(medium);
 215                 if (p->link == 0)
 216                         return -1;
 217         }
 218         return 0;
 219 }
 220
 221 static void ip6_tnl_parm_init(struct ip6_tnl_parm *p, int apply_default)
 222 {
 223         memset(p, 0, sizeof(*p));
 224         p->proto = IPPROTO_IPV6;
 225         if (apply_default) {
 226                 p->hop_limit = DEFAULT_TNL_HOP_LIMIT;
 227                 p->encap_limit = IPV6_DEFAULT_TNL_ENCAP_LIMIT;
 228         }
 229 }
 230
 231 /*
 232  * @p1: user specified parameter
 233  * @p2: database entry
 234  */
 235 static int ip6_tnl_parm_match(const struct ip6_tnl_parm *p1,
 236                               const struct ip6_tnl_parm *p2)
 237 {
 238         return ((!p1->link || p1->link == p2->link) &&
 239                 (!p1->name[0] || strcmp(p1->name, p2->name) == 0) &&
 240                 (memcmp(&p1->laddr, &in6addr_any, sizeof(p1->laddr)) == 0 ||
 241                  memcmp(&p1->laddr, &p2->laddr, sizeof(p1->laddr)) == 0) &&
 242                 (memcmp(&p1->raddr, &in6addr_any, sizeof(p1->raddr)) == 0 ||
 243                  memcmp(&p1->raddr, &p2->raddr, sizeof(p1->raddr)) == 0) &&
 244                 (!p1->proto || !p2->proto || p1->proto == p2->proto) &&
 245                 (!p1->encap_limit || p1->encap_limit == p2->encap_limit) &&
 246                 (!p1->hop_limit || p1->hop_limit == p2->hop_limit) &&
 247                 (!(p1->flowinfo & IP6_FLOWINFO_TCLASS) ||
 248                  !((p1->flowinfo ^ p2->flowinfo) & IP6_FLOWINFO_TCLASS)) &&
 249                 (!(p1->flowinfo & IP6_FLOWINFO_FLOWLABEL) ||
 250                  !((p1->flowinfo ^ p2->flowinfo) & IP6_FLOWINFO_FLOWLABEL)) &&
 251                 (!p1->flags || (p1->flags & p2->flags)));
 252 }
 253
 254 static int do_tunnels_list(struct ip6_tnl_parm *p)
 255 {
 256         char buf[512];
 257         int err = -1;
 258         FILE *fp = fopen("/proc/net/dev", "r");
 259         if (fp == NULL) {
 260                 perror("fopen");
 261                 goto end;
 262         }
 263
 264         /* skip two lines at the begenning of the file */
 265         fgets(buf, sizeof(buf), fp);
 266         fgets(buf, sizeof(buf), fp);
 267
 268         while (fgets(buf, sizeof(buf), fp) != NULL) {
 269                 char name[IFNAMSIZ];
 270                 int index, type;
 271                 unsigned long rx_bytes, rx_packets, rx_errs, rx_drops,
 272                         rx_fifo, rx_frame,
 273                         tx_bytes, tx_packets, tx_errs, tx_drops,
 274                         tx_fifo, tx_colls, tx_carrier, rx_multi;
 275                 struct ip6_tnl_parm p1;
 276                 char *ptr;
 277
 278                 buf[sizeof(buf) - 1] = '\0';
 279                 if ((ptr = strchr(buf, ':')) == NULL ||
 280                     (*ptr++ = 0, sscanf(buf, "%s", name) != 1)) {
 281                         fprintf(stderr, "Wrong format of /proc/net/dev. Sorry.\n");
 282                         goto end;
 283                 }
 284                 if (sscanf(ptr, "%ld%ld%ld%ld%ld%ld%ld%*d%ld%ld%ld%ld%ld%ld%ld",
 285                            &rx_bytes, &rx_packets, &rx_errs, &rx_drops,
 286                            &rx_fifo, &rx_frame, &rx_multi,
 287                            &tx_bytes, &tx_packets, &tx_errs, &tx_drops,
 288                            &tx_fifo, &tx_colls, &tx_carrier) != 14)
 289                         continue;
 290                 if (p->name[0] && strcmp(p->name, name))
 291                         continue;
 292                 index = ll_name_to_index(name);
 293                 if (index == 0)
 294                         continue;
 295                 type = ll_index_to_type(index);
 296                 if (type == -1) {
 297                         fprintf(stderr, "Failed to get type of [%s]\n", name);
 298                         continue;
 299                 }
 300                 if (type != ARPHRD_TUNNEL6)
 301                         continue;
 302                 memset(&p1, 0, sizeof(p1));
 303                 ip6_tnl_parm_init(&p1, 0);
 304                 strcpy(p1.name, name);
 305                 p1.link = ll_name_to_index(p1.name);
 306                 if (p1.link == 0)
 307                         continue;
 308                 if (tnl_get_ioctl(p1.name, &p1))
 309                         continue;
 310                 if (!ip6_tnl_parm_match(p, &p1))
 311                         continue;
 312                 print_tunnel(&p1);
 313                 if (show_stats) {
 314                         printf("%s", _SL_);
 315                         printf("RX: Packets    Bytes        Errors CsumErrs OutOfSeq Mcasts%s", _SL_);
 316                         printf("    %-10ld %-12ld %-6ld %-8ld %-8ld %-8ld%s",
 317                                rx_packets, rx_bytes, rx_errs, rx_frame, rx_fifo, rx_multi, _SL_);
 318                         printf("TX: Packets    Bytes        Errors DeadLoop NoRoute  NoBufs%s", _SL_);
 319                         printf("    %-10ld %-12ld %-6ld %-8ld %-8ld %-6ld",
 320                                tx_packets, tx_bytes, tx_errs, tx_colls, tx_carrier, tx_drops);
 321                 }
 322                 printf("\n");
 323         }
 324         err = 0;
 325
 326  end:
 327         if (fp)
 328                 fclose(fp);
 329         return err;
 330 }
 331
 332 static int do_show(int argc, char **argv)
 333 {
 334         struct ip6_tnl_parm p;
 335
 336         ll_init_map(&rth);
 337         ip6_tnl_parm_init(&p, 0);
 338         p.proto = 0;  /* default to any */
 339
 340         if (parse_args(argc, argv, &p) < 0)
 341                 return -1;
 342
 343         if (!p.name[0] || show_stats)
 344                 do_tunnels_list(&p);
 345         else {
 346                 if (tnl_get_ioctl(p.name, &p))
 347                         return -1;
 348                 print_tunnel(&p);
 349                 printf("\n");
 350         }
 351
 352         return 0;
 353 }
 354
 355 static int do_add(int cmd, int argc, char **argv)
 356 {
 357         struct ip6_tnl_parm p;
 358
 359         ip6_tnl_parm_init(&p, 1);
 360
 361         if (parse_args(argc, argv, &p) < 0)
 362                 return -1;
 363
 364         return tnl_add_ioctl(cmd,
 365                              cmd == SIOCCHGTUNNEL && p.name[0] ?
 366                              p.name : "ip6tnl0", p.name, &p);
 367 }
 368
 369 static int do_del(int argc, char **argv)
 370 {
 371         struct ip6_tnl_parm p;
 372
 373         ip6_tnl_parm_init(&p, 1);
 374
 375         if (parse_args(argc, argv, &p) < 0)
 376                 return -1;
 377
 378         return tnl_del_ioctl(p.name[0] ? p.name : "ip6tnl0", p.name, &p);
 379 }
 380
 381 int do_ip6tunnel(int argc, char **argv)
 382 {
 383         switch (preferred_family) {
 384         case AF_UNSPEC:
 385                 preferred_family = AF_INET6;
 386                 break;
 387         case AF_INET6:
 388                 break;
 389         default:
 390                 fprintf(stderr, "Unsupported family:%d\n", preferred_family);
 391                 exit(-1);
 392         }
 393
 394         if (argc > 0) {
 395                 if (matches(*argv, "add") == 0)
 396                         return do_add(SIOCADDTUNNEL, argc - 1, argv + 1);
 397                 if (matches(*argv, "change") == 0)
 398                         return do_add(SIOCCHGTUNNEL, argc - 1, argv + 1);
 399                 if (matches(*argv, "del") == 0)
 400                         return do_del(argc - 1, argv + 1);
 401                 if (matches(*argv, "show") == 0 ||
 402                     matches(*argv, "lst") == 0 ||
 403                     matches(*argv, "list") == 0)
 404                         return do_show(argc - 1, argv + 1);
 405                 if (matches(*argv, "help") == 0)
 406                         usage();
 407         } else
 408                 return do_show(0, NULL);
 409
 410         fprintf(stderr, "Command \"%s\" is unknown, try \"ip -f inet6 tunnel help\".\n", *argv);
 411         exit(-1);
 412 }