2 * iptunnel.c "ip tunnel"
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; either version
7 * 2 of the License, or (at your option) any later version.
9 * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
14 * Rani Assaf <rani@magic.metawire.com> 980929: resolve addresses
15 * Rani Assaf <rani@magic.metawire.com> 980930: do not allow key for ipip/sit
16 * Phil Karn <karn@ka9q.ampr.org> 990408: "pmtudisc" flag
25 #include <sys/socket.h>
26 #include <netinet/in.h>
27 #include <arpa/inet.h>
28 #include <sys/ioctl.h>
29 #include <asm/byteorder.h>
31 #include <linux/if_arp.h>
33 #include <linux/if_tunnel.h>
38 static void usage(void) __attribute__((noreturn));
40 static void usage(void)
42 fprintf(stderr, "Usage: ip tunnel { add | change | del | show } [ NAME ]\n");
43 fprintf(stderr, " [ mode { ipip | gre | sit } ] [ remote ADDR ] [ local ADDR ]\n");
44 fprintf(stderr, " [ [i|o]seq ] [ [i|o]key KEY ] [ [i|o]csum ]\n");
45 fprintf(stderr, " [ ttl TTL ] [ tos TOS ] [ [no]pmtudisc ] [ dev PHYS_DEV ]\n");
46 fprintf(stderr, "\n");
47 fprintf(stderr, "Where: NAME := STRING\n");
48 fprintf(stderr, " ADDR := { IP_ADDRESS | any }\n");
49 fprintf(stderr, " TOS := { NUMBER | inherit }\n");
50 fprintf(stderr, " TTL := { 1..255 | inherit }\n");
51 fprintf(stderr, " KEY := { DOTTED_QUAD | NUMBER }\n");
55 static int do_ioctl_get_ifindex(char *dev)
61 strcpy(ifr.ifr_name, dev);
62 fd = socket(AF_INET, SOCK_DGRAM, 0);
63 err = ioctl(fd, SIOCGIFINDEX, &ifr);
69 return ifr.ifr_ifindex;
72 static int do_ioctl_get_iftype(char *dev)
78 strcpy(ifr.ifr_name, dev);
79 fd = socket(AF_INET, SOCK_DGRAM, 0);
80 err = ioctl(fd, SIOCGIFHWADDR, &ifr);
86 return ifr.ifr_addr.sa_family;
90 static char * do_ioctl_get_ifname(int idx)
92 static struct ifreq ifr;
96 ifr.ifr_ifindex = idx;
97 fd = socket(AF_INET, SOCK_DGRAM, 0);
98 err = ioctl(fd, SIOCGIFNAME, &ifr);
109 static int do_get_ioctl(char *basedev, struct ip_tunnel_parm *p)
115 strcpy(ifr.ifr_name, basedev);
116 ifr.ifr_ifru.ifru_data = (void*)p;
117 fd = socket(AF_INET, SOCK_DGRAM, 0);
118 err = ioctl(fd, SIOCGETTUNNEL, &ifr);
125 static int do_add_ioctl(int cmd, char *basedev, struct ip_tunnel_parm *p)
131 if (cmd == SIOCCHGTUNNEL && p->name[0])
132 strcpy(ifr.ifr_name, p->name);
134 strcpy(ifr.ifr_name, basedev);
135 ifr.ifr_ifru.ifru_data = (void*)p;
136 fd = socket(AF_INET, SOCK_DGRAM, 0);
137 err = ioctl(fd, cmd, &ifr);
144 static int do_del_ioctl(char *basedev, struct ip_tunnel_parm *p)
151 strcpy(ifr.ifr_name, p->name);
153 strcpy(ifr.ifr_name, basedev);
154 ifr.ifr_ifru.ifru_data = (void*)p;
155 fd = socket(AF_INET, SOCK_DGRAM, 0);
156 err = ioctl(fd, SIOCDELTUNNEL, &ifr);
163 static int parse_args(int argc, char **argv, int cmd, struct ip_tunnel_parm *p)
166 char medium[IFNAMSIZ];
168 memset(p, 0, sizeof(*p));
169 memset(&medium, 0, sizeof(medium));
174 #define IP_DF 0x4000 /* Flag: "Don't Fragment" */
176 p->iph.frag_off = htons(IP_DF);
179 if (strcmp(*argv, "mode") == 0) {
181 if (strcmp(*argv, "ipip") == 0 ||
182 strcmp(*argv, "ip/ip") == 0) {
183 if (p->iph.protocol && p->iph.protocol != IPPROTO_IPIP) {
184 fprintf(stderr,"You managed to ask for more than one tunnel mode.\n");
187 p->iph.protocol = IPPROTO_IPIP;
188 } else if (strcmp(*argv, "gre") == 0 ||
189 strcmp(*argv, "gre/ip") == 0) {
190 if (p->iph.protocol && p->iph.protocol != IPPROTO_GRE) {
191 fprintf(stderr,"You managed to ask for more than one tunnel mode.\n");
194 p->iph.protocol = IPPROTO_GRE;
195 } else if (strcmp(*argv, "sit") == 0 ||
196 strcmp(*argv, "ipv6/ip") == 0) {
197 if (p->iph.protocol && p->iph.protocol != IPPROTO_IPV6) {
198 fprintf(stderr,"You managed to ask for more than one tunnel mode.\n");
201 p->iph.protocol = IPPROTO_IPV6;
203 fprintf(stderr,"Cannot guess tunnel mode.\n");
206 } else if (strcmp(*argv, "key") == 0) {
209 p->i_flags |= GRE_KEY;
210 p->o_flags |= GRE_KEY;
211 if (strchr(*argv, '.'))
212 p->i_key = p->o_key = get_addr32(*argv);
214 if (get_unsigned(&uval, *argv, 0)<0) {
215 fprintf(stderr, "invalid value of \"key\"\n");
218 p->i_key = p->o_key = htonl(uval);
220 } else if (strcmp(*argv, "ikey") == 0) {
223 p->i_flags |= GRE_KEY;
224 if (strchr(*argv, '.'))
225 p->o_key = get_addr32(*argv);
227 if (get_unsigned(&uval, *argv, 0)<0) {
228 fprintf(stderr, "invalid value of \"ikey\"\n");
231 p->i_key = htonl(uval);
233 } else if (strcmp(*argv, "okey") == 0) {
236 p->o_flags |= GRE_KEY;
237 if (strchr(*argv, '.'))
238 p->o_key = get_addr32(*argv);
240 if (get_unsigned(&uval, *argv, 0)<0) {
241 fprintf(stderr, "invalid value of \"okey\"\n");
244 p->o_key = htonl(uval);
246 } else if (strcmp(*argv, "seq") == 0) {
247 p->i_flags |= GRE_SEQ;
248 p->o_flags |= GRE_SEQ;
249 } else if (strcmp(*argv, "iseq") == 0) {
250 p->i_flags |= GRE_SEQ;
251 } else if (strcmp(*argv, "oseq") == 0) {
252 p->o_flags |= GRE_SEQ;
253 } else if (strcmp(*argv, "csum") == 0) {
254 p->i_flags |= GRE_CSUM;
255 p->o_flags |= GRE_CSUM;
256 } else if (strcmp(*argv, "icsum") == 0) {
257 p->i_flags |= GRE_CSUM;
258 } else if (strcmp(*argv, "ocsum") == 0) {
259 p->o_flags |= GRE_CSUM;
260 } else if (strcmp(*argv, "nopmtudisc") == 0) {
262 } else if (strcmp(*argv, "pmtudisc") == 0) {
263 p->iph.frag_off = htons(IP_DF);
264 } else if (strcmp(*argv, "remote") == 0) {
266 if (strcmp(*argv, "any"))
267 p->iph.daddr = get_addr32(*argv);
268 } else if (strcmp(*argv, "local") == 0) {
270 if (strcmp(*argv, "any"))
271 p->iph.saddr = get_addr32(*argv);
272 } else if (strcmp(*argv, "dev") == 0) {
274 strncpy(medium, *argv, IFNAMSIZ-1);
275 } else if (strcmp(*argv, "ttl") == 0) {
278 if (strcmp(*argv, "inherit") != 0) {
279 if (get_unsigned(&uval, *argv, 0))
280 invarg("invalid TTL\n", *argv);
282 invarg("TTL must be <=255\n", *argv);
285 } else if (strcmp(*argv, "tos") == 0 ||
286 matches(*argv, "dsfield") == 0) {
289 if (strcmp(*argv, "inherit") != 0) {
290 if (rtnl_dsfield_a2n(&uval, *argv))
291 invarg("bad TOS value", *argv);
296 if (strcmp(*argv, "name") == 0) {
299 if (matches(*argv, "help") == 0)
302 duparg2("name", *argv);
303 strncpy(p->name, *argv, IFNAMSIZ);
304 if (cmd == SIOCCHGTUNNEL && count == 0) {
305 struct ip_tunnel_parm old_p;
306 memset(&old_p, 0, sizeof(old_p));
307 if (do_get_ioctl(*argv, &old_p))
317 if (p->iph.protocol == 0) {
318 if (memcmp(p->name, "gre", 3) == 0)
319 p->iph.protocol = IPPROTO_GRE;
320 else if (memcmp(p->name, "ipip", 4) == 0)
321 p->iph.protocol = IPPROTO_IPIP;
322 else if (memcmp(p->name, "sit", 3) == 0)
323 p->iph.protocol = IPPROTO_IPV6;
326 if (p->iph.protocol == IPPROTO_IPIP || p->iph.protocol == IPPROTO_IPV6) {
327 if ((p->i_flags & GRE_KEY) || (p->o_flags & GRE_KEY)) {
328 fprintf(stderr, "Keys are not allowed with ipip and sit.\n");
334 p->link = do_ioctl_get_ifindex(medium);
339 if (p->i_key == 0 && IN_MULTICAST(ntohl(p->iph.daddr))) {
340 p->i_key = p->iph.daddr;
341 p->i_flags |= GRE_KEY;
343 if (p->o_key == 0 && IN_MULTICAST(ntohl(p->iph.daddr))) {
344 p->o_key = p->iph.daddr;
345 p->o_flags |= GRE_KEY;
347 if (IN_MULTICAST(ntohl(p->iph.daddr)) && !p->iph.saddr) {
348 fprintf(stderr, "Broadcast tunnel requires a source address.\n");
355 static int do_add(int cmd, int argc, char **argv)
357 struct ip_tunnel_parm p;
359 if (parse_args(argc, argv, cmd, &p) < 0)
362 if (p.iph.ttl && p.iph.frag_off == 0) {
363 fprintf(stderr, "ttl != 0 and noptmudisc are incompatible\n");
367 switch (p.iph.protocol) {
369 return do_add_ioctl(cmd, "tunl0", &p);
371 return do_add_ioctl(cmd, "gre0", &p);
373 return do_add_ioctl(cmd, "sit0", &p);
375 fprintf(stderr, "cannot determine tunnel mode (ipip, gre or sit)\n");
381 int do_del(int argc, char **argv)
383 struct ip_tunnel_parm p;
385 if (parse_args(argc, argv, SIOCDELTUNNEL, &p) < 0)
388 switch (p.iph.protocol) {
390 return do_del_ioctl("tunl0", &p);
392 return do_del_ioctl("gre0", &p);
394 return do_del_ioctl("sit0", &p);
396 return do_del_ioctl(p.name, &p);
401 void print_tunnel(struct ip_tunnel_parm *p)
408 inet_ntop(AF_INET, &p->i_key, s3, sizeof(s3));
409 inet_ntop(AF_INET, &p->o_key, s4, sizeof(s4));
411 /* Do not use format_host() for local addr,
412 * symbolic name will not be useful.
414 printf("%s: %s/ip remote %s local %s ",
416 p->iph.protocol == IPPROTO_IPIP ? "ip" :
417 (p->iph.protocol == IPPROTO_GRE ? "gre" :
418 (p->iph.protocol == IPPROTO_IPV6 ? "ipv6" : "unknown")),
419 p->iph.daddr ? format_host(AF_INET, 4, &p->iph.daddr, s1, sizeof(s1)) : "any",
420 p->iph.saddr ? rt_addr_n2a(AF_INET, 4, &p->iph.saddr, s2, sizeof(s2)) : "any");
423 char *n = do_ioctl_get_ifname(p->link);
425 printf(" dev %s ", n);
429 printf(" ttl %d ", p->iph.ttl);
431 printf(" ttl inherit ");
439 printf("%c%s ", p->iph.tos&1 ? '/' : ' ',
440 rtnl_dsfield_n2a(p->iph.tos&~1, b1, sizeof(b1)));
443 if (!(p->iph.frag_off&htons(IP_DF)))
444 printf(" nopmtudisc");
446 if ((p->i_flags&GRE_KEY) && (p->o_flags&GRE_KEY) && p->o_key == p->i_key)
447 printf(" key %s", s3);
448 else if ((p->i_flags|p->o_flags)&GRE_KEY) {
449 if (p->i_flags&GRE_KEY)
450 printf(" ikey %s ", s3);
451 if (p->o_flags&GRE_KEY)
452 printf(" okey %s ", s4);
455 if (p->i_flags&GRE_SEQ)
456 printf("%s Drop packets out of sequence.\n", _SL_);
457 if (p->i_flags&GRE_CSUM)
458 printf("%s Checksum in received packet is required.", _SL_);
459 if (p->o_flags&GRE_SEQ)
460 printf("%s Sequence packets on output.", _SL_);
461 if (p->o_flags&GRE_CSUM)
462 printf("%s Checksum output packets.", _SL_);
465 static int do_tunnels_list(struct ip_tunnel_parm *p)
468 unsigned long rx_bytes, rx_packets, rx_errs, rx_drops,
470 tx_bytes, tx_packets, tx_errs, tx_drops,
471 tx_fifo, tx_colls, tx_carrier, rx_multi;
473 struct ip_tunnel_parm p1;
476 FILE *fp = fopen("/proc/net/dev", "r");
482 fgets(buf, sizeof(buf), fp);
483 fgets(buf, sizeof(buf), fp);
485 while (fgets(buf, sizeof(buf), fp) != NULL) {
487 buf[sizeof(buf) - 1] = 0;
488 if ((ptr = strchr(buf, ':')) == NULL ||
489 (*ptr++ = 0, sscanf(buf, "%s", name) != 1)) {
490 fprintf(stderr, "Wrong format of /proc/net/dev. Sorry.\n");
493 if (sscanf(ptr, "%ld%ld%ld%ld%ld%ld%ld%*d%ld%ld%ld%ld%ld%ld%ld",
494 &rx_bytes, &rx_packets, &rx_errs, &rx_drops,
495 &rx_fifo, &rx_frame, &rx_multi,
496 &tx_bytes, &tx_packets, &tx_errs, &tx_drops,
497 &tx_fifo, &tx_colls, &tx_carrier) != 14)
499 if (p->name[0] && strcmp(p->name, name))
501 type = do_ioctl_get_iftype(name);
503 fprintf(stderr, "Failed to get type of [%s]\n", name);
506 if (type != ARPHRD_TUNNEL && type != ARPHRD_IPGRE && type != ARPHRD_SIT)
508 memset(&p1, 0, sizeof(p1));
509 if (do_get_ioctl(name, &p1))
511 if ((p->link && p1.link != p->link) ||
512 (p->name[0] && strcmp(p1.name, p->name)) ||
513 (p->iph.daddr && p1.iph.daddr != p->iph.daddr) ||
514 (p->iph.saddr && p1.iph.saddr != p->iph.saddr) ||
515 (p->i_key && p1.i_key != p->i_key))
520 printf("RX: Packets Bytes Errors CsumErrs OutOfSeq Mcasts%s", _SL_);
521 printf(" %-10ld %-12ld %-6ld %-8ld %-8ld %-8ld%s",
522 rx_packets, rx_bytes, rx_errs, rx_frame, rx_fifo, rx_multi, _SL_);
523 printf("TX: Packets Bytes Errors DeadLoop NoRoute NoBufs%s", _SL_);
524 printf(" %-10ld %-12ld %-6ld %-8ld %-8ld %-6ld",
525 tx_packets, tx_bytes, tx_errs, tx_colls, tx_carrier, tx_drops);
532 static int do_show(int argc, char **argv)
535 struct ip_tunnel_parm p;
537 if (parse_args(argc, argv, SIOCGETTUNNEL, &p) < 0)
540 switch (p.iph.protocol) {
542 err = do_get_ioctl(p.name[0] ? p.name : "tunl0", &p);
545 err = do_get_ioctl(p.name[0] ? p.name : "gre0", &p);
548 err = do_get_ioctl(p.name[0] ? p.name : "sit0", &p);
562 int do_iptunnel(int argc, char **argv)
565 if (matches(*argv, "add") == 0)
566 return do_add(SIOCADDTUNNEL, argc-1, argv+1);
567 if (matches(*argv, "change") == 0)
568 return do_add(SIOCCHGTUNNEL, argc-1, argv+1);
569 if (matches(*argv, "del") == 0)
570 return do_del(argc-1, argv+1);
571 if (matches(*argv, "show") == 0 ||
572 matches(*argv, "lst") == 0 ||
573 matches(*argv, "list") == 0)
574 return do_show(argc-1, argv+1);
575 if (matches(*argv, "help") == 0)
578 return do_show(0, NULL);
580 fprintf(stderr, "Command \"%s\" is unknown, try \"ip tunnel help\".\n", *argv);