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 <sys/ioctl.h>
28 #include <linux/if_arp.h>
29 #include <netinet/in.h>
30 #include <netinet/ip.h>
31 #include <arpa/inet.h>
32 #include <linux/if_tunnel.h>
37 static void usage(void) __attribute__((noreturn));
39 static void usage(void)
41 fprintf(stderr, "Usage: ip tunnel { add | change | del | show } [ NAME ]\n");
42 fprintf(stderr, " [ mode { ipip | gre | sit } ] [ remote ADDR ] [ local ADDR ]\n");
43 fprintf(stderr, " [ [i|o]seq ] [ [i|o]key KEY ] [ [i|o]csum ]\n");
44 fprintf(stderr, " [ ttl TTL ] [ tos TOS ] [ [no]pmtudisc ] [ dev PHYS_DEV ]\n");
45 fprintf(stderr, "\n");
46 fprintf(stderr, "Where: NAME := STRING\n");
47 fprintf(stderr, " ADDR := { IP_ADDRESS | any }\n");
48 fprintf(stderr, " TOS := { NUMBER | inherit }\n");
49 fprintf(stderr, " TTL := { 1..255 | inherit }\n");
50 fprintf(stderr, " KEY := { DOTTED_QUAD | NUMBER }\n");
54 static int do_ioctl_get_ifindex(char *dev)
60 strcpy(ifr.ifr_name, dev);
61 fd = socket(AF_INET, SOCK_DGRAM, 0);
62 err = ioctl(fd, SIOCGIFINDEX, &ifr);
68 return ifr.ifr_ifindex;
71 static int do_ioctl_get_iftype(char *dev)
77 strcpy(ifr.ifr_name, dev);
78 fd = socket(AF_INET, SOCK_DGRAM, 0);
79 err = ioctl(fd, SIOCGIFHWADDR, &ifr);
85 return ifr.ifr_addr.sa_family;
89 static char * do_ioctl_get_ifname(int idx)
91 static struct ifreq ifr;
95 ifr.ifr_ifindex = idx;
96 fd = socket(AF_INET, SOCK_DGRAM, 0);
97 err = ioctl(fd, SIOCGIFNAME, &ifr);
108 static int do_get_ioctl(char *basedev, struct ip_tunnel_parm *p)
114 strcpy(ifr.ifr_name, basedev);
115 ifr.ifr_ifru.ifru_data = (void*)p;
116 fd = socket(AF_INET, SOCK_DGRAM, 0);
117 err = ioctl(fd, SIOCGETTUNNEL, &ifr);
124 static int do_add_ioctl(int cmd, char *basedev, struct ip_tunnel_parm *p)
130 if (cmd == SIOCCHGTUNNEL && p->name[0])
131 strcpy(ifr.ifr_name, p->name);
133 strcpy(ifr.ifr_name, basedev);
134 ifr.ifr_ifru.ifru_data = (void*)p;
135 fd = socket(AF_INET, SOCK_DGRAM, 0);
136 err = ioctl(fd, cmd, &ifr);
143 static int do_del_ioctl(char *basedev, struct ip_tunnel_parm *p)
150 strcpy(ifr.ifr_name, p->name);
152 strcpy(ifr.ifr_name, basedev);
153 ifr.ifr_ifru.ifru_data = (void*)p;
154 fd = socket(AF_INET, SOCK_DGRAM, 0);
155 err = ioctl(fd, SIOCDELTUNNEL, &ifr);
162 static int parse_args(int argc, char **argv, int cmd, struct ip_tunnel_parm *p)
165 char medium[IFNAMSIZ];
167 memset(p, 0, sizeof(*p));
168 memset(&medium, 0, sizeof(medium));
173 #define IP_DF 0x4000 /* Flag: "Don't Fragment" */
175 p->iph.frag_off = htons(IP_DF);
178 if (strcmp(*argv, "mode") == 0) {
180 if (strcmp(*argv, "ipip") == 0 ||
181 strcmp(*argv, "ip/ip") == 0) {
182 if (p->iph.protocol && p->iph.protocol != IPPROTO_IPIP) {
183 fprintf(stderr,"You managed to ask for more than one tunnel mode.\n");
186 p->iph.protocol = IPPROTO_IPIP;
187 } else if (strcmp(*argv, "gre") == 0 ||
188 strcmp(*argv, "gre/ip") == 0) {
189 if (p->iph.protocol && p->iph.protocol != IPPROTO_GRE) {
190 fprintf(stderr,"You managed to ask for more than one tunnel mode.\n");
193 p->iph.protocol = IPPROTO_GRE;
194 } else if (strcmp(*argv, "sit") == 0 ||
195 strcmp(*argv, "ipv6/ip") == 0) {
196 if (p->iph.protocol && p->iph.protocol != IPPROTO_IPV6) {
197 fprintf(stderr,"You managed to ask for more than one tunnel mode.\n");
200 p->iph.protocol = IPPROTO_IPV6;
202 fprintf(stderr,"Cannot guess tunnel mode.\n");
205 } else if (strcmp(*argv, "key") == 0) {
208 p->i_flags |= GRE_KEY;
209 p->o_flags |= GRE_KEY;
210 if (strchr(*argv, '.'))
211 p->i_key = p->o_key = get_addr32(*argv);
213 if (get_unsigned(&uval, *argv, 0)<0) {
214 fprintf(stderr, "invalid value of \"key\"\n");
217 p->i_key = p->o_key = htonl(uval);
219 } else if (strcmp(*argv, "ikey") == 0) {
222 p->i_flags |= GRE_KEY;
223 if (strchr(*argv, '.'))
224 p->o_key = get_addr32(*argv);
226 if (get_unsigned(&uval, *argv, 0)<0) {
227 fprintf(stderr, "invalid value of \"ikey\"\n");
230 p->i_key = htonl(uval);
232 } else if (strcmp(*argv, "okey") == 0) {
235 p->o_flags |= GRE_KEY;
236 if (strchr(*argv, '.'))
237 p->o_key = get_addr32(*argv);
239 if (get_unsigned(&uval, *argv, 0)<0) {
240 fprintf(stderr, "invalid value of \"okey\"\n");
243 p->o_key = htonl(uval);
245 } else if (strcmp(*argv, "seq") == 0) {
246 p->i_flags |= GRE_SEQ;
247 p->o_flags |= GRE_SEQ;
248 } else if (strcmp(*argv, "iseq") == 0) {
249 p->i_flags |= GRE_SEQ;
250 } else if (strcmp(*argv, "oseq") == 0) {
251 p->o_flags |= GRE_SEQ;
252 } else if (strcmp(*argv, "csum") == 0) {
253 p->i_flags |= GRE_CSUM;
254 p->o_flags |= GRE_CSUM;
255 } else if (strcmp(*argv, "icsum") == 0) {
256 p->i_flags |= GRE_CSUM;
257 } else if (strcmp(*argv, "ocsum") == 0) {
258 p->o_flags |= GRE_CSUM;
259 } else if (strcmp(*argv, "nopmtudisc") == 0) {
261 } else if (strcmp(*argv, "pmtudisc") == 0) {
262 p->iph.frag_off = htons(IP_DF);
263 } else if (strcmp(*argv, "remote") == 0) {
265 if (strcmp(*argv, "any"))
266 p->iph.daddr = get_addr32(*argv);
267 } else if (strcmp(*argv, "local") == 0) {
269 if (strcmp(*argv, "any"))
270 p->iph.saddr = get_addr32(*argv);
271 } else if (strcmp(*argv, "dev") == 0) {
273 strncpy(medium, *argv, IFNAMSIZ-1);
274 } else if (strcmp(*argv, "ttl") == 0) {
277 if (strcmp(*argv, "inherit") != 0) {
278 if (get_unsigned(&uval, *argv, 0))
279 invarg("invalid TTL\n", *argv);
281 invarg("TTL must be <=255\n", *argv);
284 } else if (strcmp(*argv, "tos") == 0 ||
285 matches(*argv, "dsfield") == 0) {
288 if (strcmp(*argv, "inherit") != 0) {
289 if (rtnl_dsfield_a2n(&uval, *argv))
290 invarg("bad TOS value", *argv);
295 if (strcmp(*argv, "name") == 0) {
298 if (matches(*argv, "help") == 0)
301 duparg2("name", *argv);
302 strncpy(p->name, *argv, IFNAMSIZ);
303 if (cmd == SIOCCHGTUNNEL && count == 0) {
304 struct ip_tunnel_parm old_p;
305 memset(&old_p, 0, sizeof(old_p));
306 if (do_get_ioctl(*argv, &old_p))
316 if (p->iph.protocol == 0) {
317 if (memcmp(p->name, "gre", 3) == 0)
318 p->iph.protocol = IPPROTO_GRE;
319 else if (memcmp(p->name, "ipip", 4) == 0)
320 p->iph.protocol = IPPROTO_IPIP;
321 else if (memcmp(p->name, "sit", 3) == 0)
322 p->iph.protocol = IPPROTO_IPV6;
325 if (p->iph.protocol == IPPROTO_IPIP || p->iph.protocol == IPPROTO_IPV6) {
326 if ((p->i_flags & GRE_KEY) || (p->o_flags & GRE_KEY)) {
327 fprintf(stderr, "Keys are not allowed with ipip and sit.\n");
333 p->link = do_ioctl_get_ifindex(medium);
338 if (p->i_key == 0 && IN_MULTICAST(ntohl(p->iph.daddr))) {
339 p->i_key = p->iph.daddr;
340 p->i_flags |= GRE_KEY;
342 if (p->o_key == 0 && IN_MULTICAST(ntohl(p->iph.daddr))) {
343 p->o_key = p->iph.daddr;
344 p->o_flags |= GRE_KEY;
346 if (IN_MULTICAST(ntohl(p->iph.daddr)) && !p->iph.saddr) {
347 fprintf(stderr, "Broadcast tunnel requires a source address.\n");
354 static int do_add(int cmd, int argc, char **argv)
356 struct ip_tunnel_parm p;
358 if (parse_args(argc, argv, cmd, &p) < 0)
361 if (p.iph.ttl && p.iph.frag_off == 0) {
362 fprintf(stderr, "ttl != 0 and noptmudisc are incompatible\n");
366 switch (p.iph.protocol) {
368 return do_add_ioctl(cmd, "tunl0", &p);
370 return do_add_ioctl(cmd, "gre0", &p);
372 return do_add_ioctl(cmd, "sit0", &p);
374 fprintf(stderr, "cannot determine tunnel mode (ipip, gre or sit)\n");
380 int do_del(int argc, char **argv)
382 struct ip_tunnel_parm p;
384 if (parse_args(argc, argv, SIOCDELTUNNEL, &p) < 0)
387 switch (p.iph.protocol) {
389 return do_del_ioctl("tunl0", &p);
391 return do_del_ioctl("gre0", &p);
393 return do_del_ioctl("sit0", &p);
395 return do_del_ioctl(p.name, &p);
400 void print_tunnel(struct ip_tunnel_parm *p)
407 inet_ntop(AF_INET, &p->i_key, s3, sizeof(s3));
408 inet_ntop(AF_INET, &p->o_key, s4, sizeof(s4));
410 /* Do not use format_host() for local addr,
411 * symbolic name will not be useful.
413 printf("%s: %s/ip remote %s local %s ",
415 p->iph.protocol == IPPROTO_IPIP ? "ip" :
416 (p->iph.protocol == IPPROTO_GRE ? "gre" :
417 (p->iph.protocol == IPPROTO_IPV6 ? "ipv6" : "unknown")),
418 p->iph.daddr ? format_host(AF_INET, 4, &p->iph.daddr, s1, sizeof(s1)) : "any",
419 p->iph.saddr ? rt_addr_n2a(AF_INET, 4, &p->iph.saddr, s2, sizeof(s2)) : "any");
422 char *n = do_ioctl_get_ifname(p->link);
424 printf(" dev %s ", n);
428 printf(" ttl %d ", p->iph.ttl);
430 printf(" ttl inherit ");
438 printf("%c%s ", p->iph.tos&1 ? '/' : ' ',
439 rtnl_dsfield_n2a(p->iph.tos&~1, b1, sizeof(b1)));
442 if (!(p->iph.frag_off&htons(IP_DF)))
443 printf(" nopmtudisc");
445 if ((p->i_flags&GRE_KEY) && (p->o_flags&GRE_KEY) && p->o_key == p->i_key)
446 printf(" key %s", s3);
447 else if ((p->i_flags|p->o_flags)&GRE_KEY) {
448 if (p->i_flags&GRE_KEY)
449 printf(" ikey %s ", s3);
450 if (p->o_flags&GRE_KEY)
451 printf(" okey %s ", s4);
454 if (p->i_flags&GRE_SEQ)
455 printf("%s Drop packets out of sequence.\n", _SL_);
456 if (p->i_flags&GRE_CSUM)
457 printf("%s Checksum in received packet is required.", _SL_);
458 if (p->o_flags&GRE_SEQ)
459 printf("%s Sequence packets on output.", _SL_);
460 if (p->o_flags&GRE_CSUM)
461 printf("%s Checksum output packets.", _SL_);
464 static int do_tunnels_list(struct ip_tunnel_parm *p)
467 unsigned long rx_bytes, rx_packets, rx_errs, rx_drops,
469 tx_bytes, tx_packets, tx_errs, tx_drops,
470 tx_fifo, tx_colls, tx_carrier, rx_multi;
472 struct ip_tunnel_parm p1;
475 FILE *fp = fopen("/proc/net/dev", "r");
481 fgets(buf, sizeof(buf), fp);
482 fgets(buf, sizeof(buf), fp);
484 while (fgets(buf, sizeof(buf), fp) != NULL) {
486 buf[sizeof(buf) - 1] = 0;
487 if ((ptr = strchr(buf, ':')) == NULL ||
488 (*ptr++ = 0, sscanf(buf, "%s", name) != 1)) {
489 fprintf(stderr, "Wrong format of /proc/net/dev. Sorry.\n");
492 if (sscanf(ptr, "%ld%ld%ld%ld%ld%ld%ld%*d%ld%ld%ld%ld%ld%ld%ld",
493 &rx_bytes, &rx_packets, &rx_errs, &rx_drops,
494 &rx_fifo, &rx_frame, &rx_multi,
495 &tx_bytes, &tx_packets, &tx_errs, &tx_drops,
496 &tx_fifo, &tx_colls, &tx_carrier) != 14)
498 if (p->name[0] && strcmp(p->name, name))
500 type = do_ioctl_get_iftype(name);
502 fprintf(stderr, "Failed to get type of [%s]\n", name);
505 if (type != ARPHRD_TUNNEL && type != ARPHRD_IPGRE && type != ARPHRD_SIT)
507 memset(&p1, 0, sizeof(p1));
508 if (do_get_ioctl(name, &p1))
510 if ((p->link && p1.link != p->link) ||
511 (p->name[0] && strcmp(p1.name, p->name)) ||
512 (p->iph.daddr && p1.iph.daddr != p->iph.daddr) ||
513 (p->iph.saddr && p1.iph.saddr != p->iph.saddr) ||
514 (p->i_key && p1.i_key != p->i_key))
519 printf("RX: Packets Bytes Errors CsumErrs OutOfSeq Mcasts%s", _SL_);
520 printf(" %-10ld %-12ld %-6ld %-8ld %-8ld %-8ld%s",
521 rx_packets, rx_bytes, rx_errs, rx_frame, rx_fifo, rx_multi, _SL_);
522 printf("TX: Packets Bytes Errors DeadLoop NoRoute NoBufs%s", _SL_);
523 printf(" %-10ld %-12ld %-6ld %-8ld %-8ld %-6ld",
524 tx_packets, tx_bytes, tx_errs, tx_colls, tx_carrier, tx_drops);
531 static int do_show(int argc, char **argv)
534 struct ip_tunnel_parm p;
536 if (parse_args(argc, argv, SIOCGETTUNNEL, &p) < 0)
539 switch (p.iph.protocol) {
541 err = do_get_ioctl(p.name[0] ? p.name : "tunl0", &p);
544 err = do_get_ioctl(p.name[0] ? p.name : "gre0", &p);
547 err = do_get_ioctl(p.name[0] ? p.name : "sit0", &p);
561 int do_iptunnel(int argc, char **argv)
564 if (matches(*argv, "add") == 0)
565 return do_add(SIOCADDTUNNEL, argc-1, argv+1);
566 if (matches(*argv, "change") == 0)
567 return do_add(SIOCCHGTUNNEL, argc-1, argv+1);
568 if (matches(*argv, "del") == 0)
569 return do_del(argc-1, argv+1);
570 if (matches(*argv, "show") == 0 ||
571 matches(*argv, "lst") == 0 ||
572 matches(*argv, "list") == 0)
573 return do_show(argc-1, argv+1);
574 if (matches(*argv, "help") == 0)
577 return do_show(0, NULL);
579 fprintf(stderr, "Command \"%s\" is unknown, try \"ip tunnel help\".\n", *argv);