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 } 408
