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>
34 #define GRE_CSUM htons(0x8000)
36 #define GRE_ROUTING htons(0x4000)
38 #define GRE_KEY htons(0x2000)
40 #define GRE_SEQ htons(0x1000)
42 #define GRE_STRICT htons(0x0800)
44 #define GRE_REC htons(0x0700)
46 #define GRE_FLAGS htons(0x00F8)
48 #define GRE_VERSION htons(0x0007)
50 /* Old versions of glibc do not define this */
51 #if __GLIBC__ == 2 && __GLIBC_MINOR__ == 0
52 #define IPPROTO_GRE 47
57 static void usage(void) __attribute__((noreturn));
59 static void usage(void)
61 fprintf(stderr, _("Usage: iptunnel { add | change | del | show } [ NAME ]\n"));
62 fprintf(stderr, _(" [ mode { ipip | gre | sit } ] [ remote ADDR ] [ local ADDR ]\n"));
63 fprintf(stderr, _(" [ [i|o]seq ] [ [i|o]key KEY ] [ [i|o]csum ]\n"));
64 fprintf(stderr, _(" [ ttl TTL ] [ tos TOS ] [ nopmtudisc ] [ dev PHYS_DEV ]\n\n"));
65 fprintf(stderr, _("Where: NAME := STRING\n"));
66 fprintf(stderr, _(" ADDR := { IP_ADDRESS | any }\n"));
67 fprintf(stderr, _(" TOS := { NUMBER | inherit }\n"));
68 fprintf(stderr, _(" TTL := { 1..255 | inherit }\n"));
69 fprintf(stderr, _(" KEY := { DOTTED_QUAD | NUMBER }\n"));
73 static int do_ioctl_get_ifindex(char *dev)
79 strcpy(ifr.ifr_name, dev);
80 fd = socket(AF_INET, SOCK_DGRAM, 0);
81 err = ioctl(fd, SIOCGIFINDEX, &ifr);
87 return ifr.ifr_ifindex;
90 static int do_ioctl_get_iftype(char *dev)
96 strcpy(ifr.ifr_name, dev);
97 fd = socket(AF_INET, SOCK_DGRAM, 0);
98 err = ioctl(fd, SIOCGIFHWADDR, &ifr);
104 return ifr.ifr_addr.sa_family;
108 static char * do_ioctl_get_ifname(int idx)
110 static struct ifreq ifr;
114 ifr.ifr_ifindex = idx;
115 fd = socket(AF_INET, SOCK_DGRAM, 0);
116 err = ioctl(fd, SIOCGIFNAME, &ifr);
127 static int do_get_ioctl(char *basedev, struct ip_tunnel_parm *p)
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, SIOCGETTUNNEL, &ifr);
143 static int do_add_ioctl(int cmd, char *basedev, struct ip_tunnel_parm *p)
149 strcpy(ifr.ifr_name, basedev);
150 ifr.ifr_ifru.ifru_data = (void*)p;
151 fd = socket(AF_INET, SOCK_DGRAM, 0);
152 err = ioctl(fd, cmd, &ifr);
159 static int do_del_ioctl(char *basedev, struct ip_tunnel_parm *p)
165 strcpy(ifr.ifr_name, basedev);
166 ifr.ifr_ifru.ifru_data = (void*)p;
167 fd = socket(AF_INET, SOCK_DGRAM, 0);
168 err = ioctl(fd, SIOCDELTUNNEL, &ifr);
175 static int parse_args(int argc, char **argv, struct ip_tunnel_parm *p)
177 char medium[IFNAMSIZ];
179 memset(p, 0, sizeof(*p));
180 memset(&medium, 0, sizeof(medium));
185 #define IP_DF 0x4000 /* Flag: "Don't Fragment" */
187 p->iph.frag_off = htons(IP_DF);
190 if (strcmp(*argv, "mode") == 0) {
192 if (strcmp(*argv, "ipip") == 0) {
195 p->iph.protocol = IPPROTO_IPIP;
196 } else if (strcmp(*argv, "gre") == 0) {
199 p->iph.protocol = IPPROTO_GRE;
200 } else if (strcmp(*argv, "sit") == 0) {
203 p->iph.protocol = IPPROTO_IPV6;
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 (scan_number(*argv, &uval)<0)
216 p->i_key = p->o_key = htonl(uval);
218 } else if (strcmp(*argv, "ikey") == 0) {
221 p->i_flags |= GRE_KEY;
222 if (strchr(*argv, '.'))
223 p->o_key = get_addr32(*argv);
225 if (scan_number(*argv, &uval)<0)
227 p->i_key = htonl(uval);
229 } else if (strcmp(*argv, "okey") == 0) {
232 p->o_flags |= GRE_KEY;
233 if (strchr(*argv, '.'))
234 p->o_key = get_addr32(*argv);
236 if (scan_number(*argv, &uval)<0)
238 p->o_key = htonl(uval);
240 } else if (strcmp(*argv, "seq") == 0) {
241 p->i_flags |= GRE_SEQ;
242 p->o_flags |= GRE_SEQ;
243 } else if (strcmp(*argv, "iseq") == 0) {
244 p->i_flags |= GRE_SEQ;
245 } else if (strcmp(*argv, "oseq") == 0) {
246 p->o_flags |= GRE_SEQ;
247 } else if (strcmp(*argv, "csum") == 0) {
248 p->i_flags |= GRE_CSUM;
249 p->o_flags |= GRE_CSUM;
250 } else if (strcmp(*argv, "icsum") == 0) {
251 p->i_flags |= GRE_CSUM;
252 } else if (strcmp(*argv, "ocsum") == 0) {
253 p->o_flags |= GRE_CSUM;
254 } else if (strcmp(*argv, "nopmtudisc") == 0) {
256 } else if (strcmp(*argv, "remote") == 0) {
258 if (strcmp(*argv, "any"))
259 p->iph.daddr = get_addr32(*argv);
260 } else if (strcmp(*argv, "local") == 0) {
262 if (strcmp(*argv, "any"))
263 p->iph.saddr = get_addr32(*argv);
264 } else if (strcmp(*argv, "dev") == 0) {
266 strncpy(medium, *argv, IFNAMSIZ-1);
267 } else if (strcmp(*argv, "ttl") == 0) {
270 if (strcmp(*argv, "inherit") != 0) {
271 if (scan_number(*argv, &uval)<0)
277 } else if (strcmp(*argv, "tos") == 0) {
280 if (strcmp(*argv, "inherit") != 0) {
281 if (scan_number(*argv, &uval)<0)
291 strncpy(p->name, *argv, IFNAMSIZ);
296 if (p->iph.protocol == 0) {
297 if (memcmp(p->name, "gre", 3) == 0)
298 p->iph.protocol = IPPROTO_GRE;
299 else if (memcmp(p->name, "ipip", 4) == 0)
300 p->iph.protocol = IPPROTO_IPIP;
301 else if (memcmp(p->name, "sit", 3) == 0)
302 p->iph.protocol = IPPROTO_IPV6;
305 if (p->iph.protocol == IPPROTO_IPIP || p->iph.protocol == IPPROTO_IPV6) {
306 if ((p->i_flags & GRE_KEY) || (p->o_flags & GRE_KEY)) {
307 fprintf(stderr, _("Keys are not allowed with ipip and sit.\n"));
313 p->link = do_ioctl_get_ifindex(medium);
318 if (p->i_key == 0 && IN_MULTICAST(ntohl(p->iph.daddr))) {
319 p->i_key = p->iph.daddr;
320 p->i_flags |= GRE_KEY;
322 if (p->o_key == 0 && IN_MULTICAST(ntohl(p->iph.daddr))) {
323 p->o_key = p->iph.daddr;
324 p->o_flags |= GRE_KEY;
326 if (IN_MULTICAST(ntohl(p->iph.daddr)) && !p->iph.saddr) {
327 fprintf(stderr, _("Broadcast tunnel requires a source address.\n"));
334 static int do_add(int cmd, int argc, char **argv)
336 struct ip_tunnel_parm p;
338 if (parse_args(argc, argv, &p) < 0)
341 if (p.iph.ttl && p.iph.frag_off == 0) {
342 fprintf(stderr, _("ttl != 0 and noptmudisc are incompatible\n"));
346 switch (p.iph.protocol) {
348 return do_add_ioctl(cmd, "tunl0", &p);
350 return do_add_ioctl(cmd, "gre0", &p);
352 return do_add_ioctl(cmd, "sit0", &p);
354 fprintf(stderr, _("cannot determine tunnel mode (ipip, gre or sit)\n"));
360 int do_del(int argc, char **argv)
362 struct ip_tunnel_parm p;
364 if (parse_args(argc, argv, &p) < 0)
367 switch (p.iph.protocol) {
369 return do_del_ioctl(p.name[0] ? p.name : "tunl0", &p);
371 return do_del_ioctl(p.name[0] ? p.name : "gre0", &p);
373 return do_del_ioctl(p.name[0] ? p.name : "sit0", &p);
375 return do_del_ioctl(p.name, &p);
380 void print_tunnel(struct ip_tunnel_parm *p)
387 format_host(AF_INET, &p->iph.daddr, s1, sizeof(s1));
388 format_host(AF_INET, &p->iph.saddr, s2, sizeof(s2));
389 inet_ntop(AF_INET, &p->i_key, s3, sizeof(s3));
390 inet_ntop(AF_INET, &p->o_key, s4, sizeof(s4));
392 printf(_("%s: %s/ip remote %s local %s "),
394 p->iph.protocol == IPPROTO_IPIP ? "ip" :
395 (p->iph.protocol == IPPROTO_GRE ? "gre" :
396 (p->iph.protocol == IPPROTO_IPV6 ? "ipv6" : _("unknown"))),
397 p->iph.daddr ? s1 : "any", p->iph.saddr ? s2 : "any");
399 char *n = do_ioctl_get_ifname(p->link);
401 printf(" dev %s ", n);
404 printf(" ttl %d ", p->iph.ttl);
406 printf(" ttl inherit ");
412 printf("%c%02x ", p->iph.tos&1 ? '/' : ' ', p->iph.tos&~1);
414 if (!(p->iph.frag_off&htons(IP_DF)))
415 printf(" nopmtudisc");
417 if ((p->i_flags&GRE_KEY) && (p->o_flags&GRE_KEY) && p->o_key == p->i_key)
418 printf(" key %s", s3);
419 else if ((p->i_flags|p->o_flags)&GRE_KEY) {
420 if (p->i_flags&GRE_KEY)
421 printf(" ikey %s ", s3);
422 if (p->o_flags&GRE_KEY)
423 printf(" okey %s ", s4);
427 if (p->i_flags&GRE_SEQ)
428 printf(_(" Drop packets out of sequence.\n"));
429 if (p->i_flags&GRE_CSUM)
430 printf(_(" Checksum in received packet is required.\n"));
431 if (p->o_flags&GRE_SEQ)
432 printf(_(" Sequence packets on output.\n"));
433 if (p->o_flags&GRE_CSUM)
434 printf(_(" Checksum output packets.\n"));
437 static int do_tunnels_list(struct ip_tunnel_parm *p)
440 unsigned long rx_bytes, rx_packets, rx_errs, rx_drops,
442 tx_bytes, tx_packets, tx_errs, tx_drops,
443 tx_fifo, tx_colls, tx_carrier, rx_multi;
445 struct ip_tunnel_parm p1;
448 FILE *fp = fopen("/proc/net/dev", "r");
454 fgets(buf, sizeof(buf), fp);
455 fgets(buf, sizeof(buf), fp);
457 while (fgets(buf, sizeof(buf), fp) != NULL) {
459 buf[sizeof(buf) - 1] = 0;
460 if ((ptr = strchr(buf, ':')) == NULL ||
461 (*ptr++ = 0, sscanf(buf, "%s", name) != 1)) {
462 fprintf(stderr, _("Wrong format of /proc/net/dev. Sorry.\n"));
465 if (sscanf(ptr, "%ld%ld%ld%ld%ld%ld%ld%*d%ld%ld%ld%ld%ld%ld%ld",
466 &rx_bytes, &rx_packets, &rx_errs, &rx_drops,
467 &rx_fifo, &rx_frame, &rx_multi,
468 &tx_bytes, &tx_packets, &tx_errs, &tx_drops,
469 &tx_fifo, &tx_colls, &tx_carrier) != 14)
471 if (p->name[0] && strcmp(p->name, name))
473 type = do_ioctl_get_iftype(name);
475 fprintf(stderr, _("Failed to get type of [%s]\n"), name);
478 if (type != ARPHRD_TUNNEL && type != ARPHRD_IPGRE && type != ARPHRD_SIT)
480 memset(&p1, 0, sizeof(p1));
481 if (do_get_ioctl(name, &p1))
483 if ((p->link && p1.link != p->link) ||
484 (p->name[0] && strcmp(p1.name, p->name)) ||
485 (p->iph.daddr && p1.iph.daddr != p->iph.daddr) ||
486 (p->iph.saddr && p1.iph.saddr != p->iph.saddr) ||
487 (p->i_key && p1.i_key != p->i_key))
491 printf(_("RX: Packets Bytes Errors CsumErrs OutOfSeq Mcasts\n"));
492 printf(" %-10ld %-12ld %-6ld %-8ld %-8ld %-8ld\n",
493 rx_packets, rx_bytes, rx_errs, rx_frame, rx_fifo, rx_multi);
494 printf(_("TX: Packets Bytes Errors DeadLoop NoRoute NoBufs\n"));
495 printf(" %-10ld %-12ld %-6ld %-8ld %-8ld %-6ld\n\n",
496 tx_packets, tx_bytes, tx_errs, tx_colls, tx_carrier, tx_drops);
502 static int do_show(int argc, char **argv)
505 struct ip_tunnel_parm p;
507 if (parse_args(argc, argv, &p) < 0)
510 switch (p.iph.protocol) {
512 err = do_get_ioctl(p.name[0] ? p.name : "tunl0", &p);
515 err = do_get_ioctl(p.name[0] ? p.name : "gre0", &p);
518 err = do_get_ioctl(p.name[0] ? p.name : "sit0", &p);
531 int do_iptunnel(int argc, char **argv)
534 if (matches(*argv, "add") == 0)
535 return do_add(SIOCADDTUNNEL, argc-1, argv+1);
536 if (matches(*argv, "change") == 0)
537 return do_add(SIOCCHGTUNNEL, argc-1, argv+1);
538 if (matches(*argv, "del") == 0)
539 return do_del(argc-1, argv+1);
540 if (matches(*argv, "show") == 0 ||
541 matches(*argv, "lst") == 0 ||
542 matches(*argv, "list") == 0)
543 return do_show(argc-1, argv+1);
545 return do_show(0, NULL);
551 int preferred_family = AF_UNSPEC;
553 int resolve_hosts = 0;
555 int main(int argc, char **argv)
559 basename = strrchr(argv[0], '/');
560 if (basename == NULL)
566 if (argv[1][0] != '-')
568 if (matches(argv[1], "-family") == 0) {
573 if (strcmp(argv[1], "inet") == 0)
574 preferred_family = AF_INET;
575 else if (strcmp(argv[1], "inet6") == 0)
576 preferred_family = AF_INET6;
579 } else if (matches(argv[1], "-stats") == 0 ||
580 matches(argv[1], "-statistics") == 0) {
582 } else if (matches(argv[1], "-resolve") == 0) {
589 return do_iptunnel(argc-1, argv+1);