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