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
24 #include <sys/socket.h>
25 #include <sys/ioctl.h>
27 #include <linux/if_arp.h>
28 #include <netinet/in.h>
29 #include <netinet/ip.h>
30 #include <arpa/inet.h>
31 #include <linux/if_tunnel.h>
35 #include "net-support.h"
40 #define GRE_CSUM htons(0x8000)
42 #define GRE_ROUTING htons(0x4000)
44 #define GRE_KEY htons(0x2000)
46 #define GRE_SEQ htons(0x1000)
48 #define GRE_STRICT htons(0x0800)
50 #define GRE_REC htons(0x0700)
52 #define GRE_FLAGS htons(0x00F8)
54 #define GRE_VERSION htons(0x0007)
56 /* Old versions of glibc do not define this */
57 #if __GLIBC__ == 2 && __GLIBC_MINOR__ == 0
58 #define IPPROTO_GRE 47
63 char *Release = RELEASE,
64 *Version = "iptunnel 1.0",
65 *Signature = "Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>";
67 static void version(void)
69 printf("%s\n%s\n%s\n", Release, Version, Signature);
73 static void usage(void) __attribute__((noreturn));
75 static void usage(void)
77 fprintf(stderr, _("Usage: iptunnel { add | change | del | show } [ NAME ]\n"));
78 fprintf(stderr, _(" [ mode { ipip | gre | sit } ] [ remote ADDR ] [ local ADDR ]\n"));
79 fprintf(stderr, _(" [ [i|o]seq ] [ [i|o]key KEY ] [ [i|o]csum ]\n"));
80 fprintf(stderr, _(" [ ttl TTL ] [ tos TOS ] [ nopmtudisc ] [ dev PHYS_DEV ]\n"));
81 fprintf(stderr, _(" iptunnel -V | --version\n\n"));
82 fprintf(stderr, _("Where: NAME := STRING\n"));
83 fprintf(stderr, _(" ADDR := { IP_ADDRESS | any }\n"));
84 fprintf(stderr, _(" TOS := { NUMBER | inherit }\n"));
85 fprintf(stderr, _(" TTL := { 1..255 | inherit }\n"));
86 fprintf(stderr, _(" KEY := { DOTTED_QUAD | NUMBER }\n"));
90 static int do_ioctl_get_ifindex(char *dev)
96 strcpy(ifr.ifr_name, dev);
97 fd = socket(AF_INET, SOCK_DGRAM, 0);
98 err = ioctl(fd, SIOCGIFINDEX, &ifr);
104 return ifr.ifr_ifindex;
107 static int do_ioctl_get_iftype(char *dev)
113 strcpy(ifr.ifr_name, dev);
114 fd = socket(AF_INET, SOCK_DGRAM, 0);
115 err = ioctl(fd, SIOCGIFHWADDR, &ifr);
121 return ifr.ifr_addr.sa_family;
125 static char * do_ioctl_get_ifname(int idx)
127 static struct ifreq ifr;
131 ifr.ifr_ifindex = idx;
132 fd = socket(AF_INET, SOCK_DGRAM, 0);
133 err = ioctl(fd, SIOCGIFNAME, &ifr);
144 static int do_get_ioctl(char *basedev, struct ip_tunnel_parm *p)
150 strcpy(ifr.ifr_name, basedev);
151 ifr.ifr_ifru.ifru_data = (void*)p;
152 fd = socket(AF_INET, SOCK_DGRAM, 0);
153 err = ioctl(fd, SIOCGETTUNNEL, &ifr);
160 static int do_add_ioctl(int cmd, char *basedev, struct ip_tunnel_parm *p)
166 strcpy(ifr.ifr_name, basedev);
167 ifr.ifr_ifru.ifru_data = (void*)p;
168 fd = socket(AF_INET, SOCK_DGRAM, 0);
169 err = ioctl(fd, cmd, &ifr);
176 static int do_del_ioctl(char *basedev, struct ip_tunnel_parm *p)
182 strcpy(ifr.ifr_name, basedev);
183 ifr.ifr_ifru.ifru_data = (void*)p;
184 fd = socket(AF_INET, SOCK_DGRAM, 0);
185 err = ioctl(fd, SIOCDELTUNNEL, &ifr);
192 static int parse_args(int argc, char **argv, struct ip_tunnel_parm *p)
194 char medium[IFNAMSIZ];
196 memset(p, 0, sizeof(*p));
197 memset(&medium, 0, sizeof(medium));
202 #define IP_DF 0x4000 /* Flag: "Don't Fragment" */
204 p->iph.frag_off = htons(IP_DF);
207 if (strcmp(*argv, "mode") == 0) {
209 if (strcmp(*argv, "ipip") == 0) {
212 p->iph.protocol = IPPROTO_IPIP;
213 } else if (strcmp(*argv, "gre") == 0) {
216 p->iph.protocol = IPPROTO_GRE;
217 } else if (strcmp(*argv, "sit") == 0) {
220 p->iph.protocol = IPPROTO_IPV6;
223 } else if (strcmp(*argv, "key") == 0) {
226 p->i_flags |= GRE_KEY;
227 p->o_flags |= GRE_KEY;
228 if (strchr(*argv, '.'))
229 p->i_key = p->o_key = get_addr32(*argv);
231 if (scan_number(*argv, &uval)<0)
233 p->i_key = p->o_key = htonl(uval);
235 } else if (strcmp(*argv, "ikey") == 0) {
238 p->i_flags |= GRE_KEY;
239 if (strchr(*argv, '.'))
240 p->o_key = get_addr32(*argv);
242 if (scan_number(*argv, &uval)<0)
244 p->i_key = htonl(uval);
246 } else if (strcmp(*argv, "okey") == 0) {
249 p->o_flags |= GRE_KEY;
250 if (strchr(*argv, '.'))
251 p->o_key = get_addr32(*argv);
253 if (scan_number(*argv, &uval)<0)
255 p->o_key = htonl(uval);
257 } else if (strcmp(*argv, "seq") == 0) {
258 p->i_flags |= GRE_SEQ;
259 p->o_flags |= GRE_SEQ;
260 } else if (strcmp(*argv, "iseq") == 0) {
261 p->i_flags |= GRE_SEQ;
262 } else if (strcmp(*argv, "oseq") == 0) {
263 p->o_flags |= GRE_SEQ;
264 } else if (strcmp(*argv, "csum") == 0) {
265 p->i_flags |= GRE_CSUM;
266 p->o_flags |= GRE_CSUM;
267 } else if (strcmp(*argv, "icsum") == 0) {
268 p->i_flags |= GRE_CSUM;
269 } else if (strcmp(*argv, "ocsum") == 0) {
270 p->o_flags |= GRE_CSUM;
271 } else if (strcmp(*argv, "nopmtudisc") == 0) {
273 } else if (strcmp(*argv, "remote") == 0) {
275 if (strcmp(*argv, "any"))
276 p->iph.daddr = get_addr32(*argv);
277 } else if (strcmp(*argv, "local") == 0) {
279 if (strcmp(*argv, "any"))
280 p->iph.saddr = get_addr32(*argv);
281 } else if (strcmp(*argv, "dev") == 0) {
283 safe_strncpy(medium, *argv, IFNAMSIZ-1);
284 } else if (strcmp(*argv, "ttl") == 0) {
287 if (strcmp(*argv, "inherit") != 0) {
288 if (scan_number(*argv, &uval)<0)
294 } else if (strcmp(*argv, "tos") == 0) {
297 if (strcmp(*argv, "inherit") != 0) {
298 if (scan_number(*argv, &uval)<0)
308 safe_strncpy(p->name, *argv, IFNAMSIZ);
313 if (p->iph.protocol == 0) {
314 if (memcmp(p->name, "gre", 3) == 0)
315 p->iph.protocol = IPPROTO_GRE;
316 else if (memcmp(p->name, "ipip", 4) == 0)
317 p->iph.protocol = IPPROTO_IPIP;
318 else if (memcmp(p->name, "sit", 3) == 0)
319 p->iph.protocol = IPPROTO_IPV6;
322 if (p->iph.protocol == IPPROTO_IPIP || p->iph.protocol == IPPROTO_IPV6) {
323 if ((p->i_flags & GRE_KEY) || (p->o_flags & GRE_KEY)) {
324 fprintf(stderr, _("Keys are not allowed with ipip and sit.\n"));
330 p->link = do_ioctl_get_ifindex(medium);
335 if (p->i_key == 0 && IN_MULTICAST(ntohl(p->iph.daddr))) {
336 p->i_key = p->iph.daddr;
337 p->i_flags |= GRE_KEY;
339 if (p->o_key == 0 && IN_MULTICAST(ntohl(p->iph.daddr))) {
340 p->o_key = p->iph.daddr;
341 p->o_flags |= GRE_KEY;
343 if (IN_MULTICAST(ntohl(p->iph.daddr)) && !p->iph.saddr) {
344 fprintf(stderr, _("Broadcast tunnel requires a source address.\n"));
351 static int do_add(int cmd, int argc, char **argv)
353 struct ip_tunnel_parm p;
355 if (parse_args(argc, argv, &p) < 0)
358 if (p.iph.ttl && p.iph.frag_off == 0) {
359 fprintf(stderr, _("ttl != 0 and noptmudisc are incompatible\n"));
363 switch (p.iph.protocol) {
365 return do_add_ioctl(cmd, "tunl0", &p);
367 return do_add_ioctl(cmd, "gre0", &p);
369 return do_add_ioctl(cmd, "sit0", &p);
371 fprintf(stderr, _("cannot determine tunnel mode (ipip, gre or sit)\n"));
377 int do_del(int argc, char **argv)
379 struct ip_tunnel_parm p;
381 if (parse_args(argc, argv, &p) < 0)
384 switch (p.iph.protocol) {
386 return do_del_ioctl(p.name[0] ? p.name : "tunl0", &p);
388 return do_del_ioctl(p.name[0] ? p.name : "gre0", &p);
390 return do_del_ioctl(p.name[0] ? p.name : "sit0", &p);
392 return do_del_ioctl(p.name, &p);
397 void print_tunnel(struct ip_tunnel_parm *p)
404 format_host(AF_INET, &p->iph.daddr, s1, sizeof(s1));
405 format_host(AF_INET, &p->iph.saddr, s2, sizeof(s2));
406 inet_ntop(AF_INET, &p->i_key, s3, sizeof(s3));
407 inet_ntop(AF_INET, &p->o_key, s4, sizeof(s4));
409 printf(_("%s: %s/ip remote %s local %s "),
411 p->iph.protocol == IPPROTO_IPIP ? "ip" :
412 (p->iph.protocol == IPPROTO_GRE ? "gre" :
413 (p->iph.protocol == IPPROTO_IPV6 ? "ipv6" : _("unknown"))),
414 p->iph.daddr ? s1 : "any", p->iph.saddr ? s2 : "any");
416 char *n = do_ioctl_get_ifname(p->link);
418 printf(" dev %s ", n);
421 printf(" ttl %d ", p->iph.ttl);
423 printf(" ttl inherit ");
429 printf("%c%02x ", p->iph.tos&1 ? '/' : ' ', p->iph.tos&~1);
431 if (!(p->iph.frag_off&htons(IP_DF)))
432 printf(" nopmtudisc");
434 if ((p->i_flags&GRE_KEY) && (p->o_flags&GRE_KEY) && p->o_key == p->i_key)
435 printf(" key %s", s3);
436 else if ((p->i_flags|p->o_flags)&GRE_KEY) {
437 if (p->i_flags&GRE_KEY)
438 printf(" ikey %s ", s3);
439 if (p->o_flags&GRE_KEY)
440 printf(" okey %s ", s4);
444 if (p->i_flags&GRE_SEQ)
445 printf(_(" Drop packets out of sequence.\n"));
446 if (p->i_flags&GRE_CSUM)
447 printf(_(" Checksum in received packet is required.\n"));
448 if (p->o_flags&GRE_SEQ)
449 printf(_(" Sequence packets on output.\n"));
450 if (p->o_flags&GRE_CSUM)
451 printf(_(" Checksum output packets.\n"));
454 static int do_tunnels_list(struct ip_tunnel_parm *p)
457 unsigned long rx_bytes, rx_packets, rx_errs, rx_drops,
459 tx_bytes, tx_packets, tx_errs, tx_drops,
460 tx_fifo, tx_colls, tx_carrier, rx_multi;
462 struct ip_tunnel_parm p1;
465 FILE *fp = fopen("/proc/net/dev", "r");
471 fgets(buf, sizeof(buf), fp);
472 fgets(buf, sizeof(buf), fp);
474 while (fgets(buf, sizeof(buf), fp) != NULL) {
476 buf[sizeof(buf) - 1] = 0;
477 if ((ptr = strchr(buf, ':')) == NULL ||
478 (*ptr++ = 0, sscanf(buf, "%s", name) != 1)) {
479 fprintf(stderr, _("Wrong format of /proc/net/dev. Sorry.\n"));
482 if (sscanf(ptr, "%ld%ld%ld%ld%ld%ld%ld%*d%ld%ld%ld%ld%ld%ld%ld",
483 &rx_bytes, &rx_packets, &rx_errs, &rx_drops,
484 &rx_fifo, &rx_frame, &rx_multi,
485 &tx_bytes, &tx_packets, &tx_errs, &tx_drops,
486 &tx_fifo, &tx_colls, &tx_carrier) != 14)
488 if (p->name[0] && strcmp(p->name, name))
490 type = do_ioctl_get_iftype(name);
492 fprintf(stderr, _("Failed to get type of [%s]\n"), name);
495 if (type != ARPHRD_TUNNEL && type != ARPHRD_IPGRE && type != ARPHRD_SIT)
497 memset(&p1, 0, sizeof(p1));
498 if (do_get_ioctl(name, &p1))
500 if ((p->link && p1.link != p->link) ||
501 (p->name[0] && strcmp(p1.name, p->name)) ||
502 (p->iph.daddr && p1.iph.daddr != p->iph.daddr) ||
503 (p->iph.saddr && p1.iph.saddr != p->iph.saddr) ||
504 (p->i_key && p1.i_key != p->i_key))
508 printf(_("RX: Packets Bytes Errors CsumErrs OutOfSeq Mcasts\n"));
509 printf(" %-10ld %-12ld %-6ld %-8ld %-8ld %-8ld\n",
510 rx_packets, rx_bytes, rx_errs, rx_frame, rx_fifo, rx_multi);
511 printf(_("TX: Packets Bytes Errors DeadLoop NoRoute NoBufs\n"));
512 printf(" %-10ld %-12ld %-6ld %-8ld %-8ld %-6ld\n\n",
513 tx_packets, tx_bytes, tx_errs, tx_colls, tx_carrier, tx_drops);
519 static int do_show(int argc, char **argv)
522 struct ip_tunnel_parm p;
524 if (parse_args(argc, argv, &p) < 0)
527 switch (p.iph.protocol) {
529 err = do_get_ioctl(p.name[0] ? p.name : "tunl0", &p);
532 err = do_get_ioctl(p.name[0] ? p.name : "gre0", &p);
535 err = do_get_ioctl(p.name[0] ? p.name : "sit0", &p);
548 int do_iptunnel(int argc, char **argv)
551 if (matches(*argv, "add") == 0)
552 return do_add(SIOCADDTUNNEL, argc-1, argv+1);
553 if (matches(*argv, "change") == 0)
554 return do_add(SIOCCHGTUNNEL, argc-1, argv+1);
555 if (matches(*argv, "del") == 0)
556 return do_del(argc-1, argv+1);
557 if (matches(*argv, "show") == 0 ||
558 matches(*argv, "lst") == 0 ||
559 matches(*argv, "list") == 0)
560 return do_show(argc-1, argv+1);
562 return do_show(0, NULL);
568 int preferred_family = AF_UNSPEC;
570 int resolve_hosts = 0;
572 int main(int argc, char **argv)
577 bindtextdomain("net-tools", "/usr/share/locale");
578 textdomain("net-tools");
581 basename = strrchr(argv[0], '/');
582 if (basename == NULL)
588 if (argv[1][0] != '-')
590 if (matches(argv[1], "-family") == 0) {
595 if (strcmp(argv[1], "inet") == 0)
596 preferred_family = AF_INET;
597 else if (strcmp(argv[1], "inet6") == 0)
598 preferred_family = AF_INET6;
601 } else if (matches(argv[1], "-stats") == 0 ||
602 matches(argv[1], "-statistics") == 0) {
604 } else if (matches(argv[1], "-resolve") == 0) {
606 } else if ((matches(argv[1], "-V") == 0) || (matches(argv[1], "--version") == 0)) {
613 return do_iptunnel(argc-1, argv+1);